P087A, P087B, P087C, P087D, P087E, P087F ISO/SAE Reserved

P0395 – P03FF ISO/SAE reserved

P0880 TCM Power Input Signal

What does P0880 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary by year, make, model, and powertrain configuration.

If your vehicle has stored a P0880 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) light, it means that the powertrain control module (PCM) has detected a problem in the TCM power input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0880 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The electronic transmission control systems of OBD-II equipped vehicles are managed using a network of computers (called control modules). This involves constant communication between the various control modules via the controller area network (CAN).

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is not only used for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

As with many other automatic transmission malfunctions, a transmission control system code can be caused by an electrical or mechanical failure. If the PCM detects a malfunction, the MIL should illuminate and a P0880 code will be stored.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0880 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0880 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the troubleshooting steps for P0880?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0880 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by looking for technical service bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick fix for your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0880 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and the vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

If voltage and ground are detected at the TCM, test the corresponding circuit at the PCM connector. If no voltage is detected there, suspect an open circuit between the component in question and the PCM. If voltage is found there, suspect a faulty TCM, PCM, or a programming error.

P0880 is typically stored due to a faulty ignition relay

P0881 TCM Power Input Signal Range/Performance

What does P0881 mean?

If your vehicle has stored a P0881 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) indicator, it means that the powertrain control module (PCM) has detected an out-of-range voltage or performance issue in the TCM power supply input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0881 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The electronic transmission control systems of OBD-II equipped vehicles are managed using a network of computers (called control modules). This involves constant communication between different control modules via the controller area network (CAN).

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is used not only for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has presented a P0881 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0881 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Faulty TCM, PCM, or programming error

What are the troubleshooting steps for P0881?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0881 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by searching for technical service bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick solution to your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test-drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0881 to store may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace blown or faulty fuses as needed and retest.

P0881 is typically stored due to a faulty contact relay

P0882 TCM Low Power Supply Input Signal

What does P0882 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996 and newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary by year, make, model, and powertrain configuration.
If your vehicle has stored a P0882 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) light, it means that the powertrain control module (PCM) has detected a low voltage condition in the TCM power supply input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0882 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is used not only for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0882 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0882 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the troubleshooting steps for P0882?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0882 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test-drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0882 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

P0882 is typically stored due to a faulty contact relay

P0883 TCM High Power Input Signal

What does P0883 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

If your vehicle has stored a P0883 code, accompanied by a malfunction indicator lamp (MIL) and/or a TCM (transmission control module) light, it means that the powertrain control module (PCM) has detected a high voltage condition in the TCM power supply input circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0883 code is stored, it is likely that other PCM and/or TCM codes are also stored. Anti-lock braking system (ABS) codes may also be recorded.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

How severe is this DTC?

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0883 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0883 fault code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Faulty TCM, PCM, or programming error

What are the troubleshooting steps for P0883?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0883 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0883 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

P0883 is typically stored due to a faulty contact relay

P0884 TCM Intermittent Power Input Signal

What does P0884 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Allison, Range Rover, BMW, Chevy, Kia, Dodge, Jeep, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

If your vehicle has stored a P0884 code, accompanied by a Malfunction Indicator Lamp (MIL) and/or a Transmission Control Module (TCM) light, it means the Powertrain Control Module (PCM) has detected an intermittent voltage condition in the TCM power supply input circuit.

While some Transmission Control Modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P-codes, B-codes, or even U-codes, depending on the vehicle’s make and model. If a P0884 code is stored, it is highly likely that other PCM and/or TCM codes are also stored. Anti-lock Brake System (ABS) codes may also be recorded.

The CAN is a complex system of wiring and connectors used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is used not only for comparison purposes in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems.

The PCM uses input signals from various engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily separate from the sprag so the gear ratio can be smoothly changed. One or more Electronic Pressure Control (EPC) solenoids help regulate fluid pressure. Electronic Pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

How severe is this DTC?

If this code is stored, you may have noticed your transmission shifting much harder than normal. If your vehicle has set a P0884 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0884 fault code may include:

Electronic Traction Control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other related codes
ABS disabled

What are some common causes of the code?

The Causes

of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle Speed Sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the P0884 troubleshooting steps?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0884 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by searching for Technical Service Bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the correct TSB, it might provide a quick fix for your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0884 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location charts, wiring diagrams, and diagnostic flowcharts (related to the code and the specific vehicle) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system fuses. Replace any blown or faulty fuses as needed and retest.

P0884 is typically stored due to a faulty ignition relay

P0885 TCM Power Relay Control Circuit / Open

Code P0885: Definition, Symptoms, Causes and Diagnosis

📌 Quick Overview

Definition: Electrical problem in the TCM (Transmission Control Module) power relay circuit.
Severity: Medium to High (risk of transmission damage).
Symptoms: Harsh gear shifts, ABS/traction control system deactivated, associated codes.
Common Causes: Blown fuse, faulty relay, damaged wiring, TCM/PCM failure.

1. Meaning of Code P0885

Code P0885 indicates that the PCM (Powertrain Control Module) has detected an electrical anomaly in the TCM power relay circuit. This relay controls the electrical power supply to the TCM, which is essential for managing the automatic transmission.

Key Operation:

The TCM communicates with the PCM via the CAN (Controller Area Network) bus.
Shared data includes: engine RPM, vehicle speed, hydraulic pressure.
A failure in this circuit disrupts the shift strategy and related systems (ABS, stability control).

2. Severity and Risks

Immediate Problems:
Harsh or impossible gear changes.
Deactivation of safety systems (ABS, traction control).
Long-Term Risks:
Premature wear of clutches and hydraulic components.
Transmission overheating.

3. Common Symptoms

🚨 Check Engine Light illuminated (MIL).
🔧 Erratic or delayed gear changes.
🛑 Automatic deactivation of traction control/ABS.
⚡ Other stored codes (e.g., P0865, U codes related to CAN).

4. Possible Causes

Category	Detailed Causes
Electrical	– Blown fuse or faulty TCM relay.
	– Damaged wiring (short circuits, chafed wires).
	– Oxidized or poorly secured connectors.
Electronic	– TCM or PCM failure.
	– Module programming error.
Mechanical	– Hydraulic pressure problem in the transmission.
CAN System	– Disturbances or failures in the communication network.

5. Diagnostic Steps

Required Tools:

OBD-II scanner (reading codes and live data).
Digital multimeter (testing voltage/resistance).
Oscilloscope (analyzing speed sensor signals).

Procedure:

Code Reading:

Identify all stored codes (P, B, U).
Consult Technical Service Bulletins (TSBs) for known solutions.

Visual Inspection:

Check fuses, relays, and wiring related to the TCM.
Look for signs of burning, corrosion, or cut wires.

Electrical Tests:

Measure the TCM power supply voltage (should be ~12V).
Test the continuity of the CAN circuits between TCM and PCM.

Component Verification:

Replace the TCM relay with a known good relay for testing.
Use the oscilloscope to analyze speed sensor signals.

Advanced Diagnostics:

If the TCM/PCM is suspected, perform a test with a replacement module.
Update module software if programming errors are detected.

6. Common Solutions

🔌 Replace a faulty fuse/relay: Average cost €10–50.
🔧 Repair damaged wiring: Solder or replace problematic wires.
💻 Reset/Update the TCM/PCM: Requires a professional diagnostic tool.
⚠️ Replace the TCM: High cost (€300–1000 depending on model).

7. Practical Tips

Do not ignore intermittent codes: An intermittent P0885 can signal an emerging problem.
Check the transmission fluid level and condition: Low hydraulic pressure can worsen symptoms.
Consult a professional: CAN and TCM systems require expertise for accurate diagnosis.

8. Frequently Affected Models

Hyundai/Kia: Tucson, Sportage (recurring relay issues).
Jeep/Dodge: Grand Cherokee, Ram 1500 (TCM failures).
Ford: Focus, F-150 (fragile wiring near the transmission).

Conclusion

Code P0885 signals a critical electrical problem affecting transmission management. A methodical diagnosis (fuses, relays, wiring) is essential to avoid costly repairs. If technical skills are lacking, entrust the vehicle to a specialist in automotive electronic systems.

⚠️ Reminder: A malfunctioning transmission can endanger your safety. Act quickly!

P0886 TCM Power Relay Control Circuit Low

What does P0886 mean?

If your vehicle has stored a P0886 code, accompanied by a malfunction indicator lamp (MIL), it means that the powertrain control module (PCM) has detected a low voltage condition in the TCM power relay control circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0886 code is stored, it is likely that other PCM and/or TCM codes are also stored.

The CAN is a complex wiring and connector system used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is not only used for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems. This code is unique in that it is typically stored only if other traction control system-related codes are present. These may be codes related to mechanical or electronic issues.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily disengage from the sprag so that the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so that the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

As with many other automatic transmission malfunctions, a transmission control system code can be caused by an electrical or mechanical failure. If the PCM detects a malfunction that requires the MIL to illuminate, a P0886 code will be stored, and the MIL may light up.

How severe is this DTC?

Battery voltage is supplied to the TCM using one (or more) fuses and/or contact relays. If the TCM or PCM detects insufficient voltage on the input supply (from the relay or fuse), a P0886 will be stored, and the MIL will illuminate.

If this code is stored, you may have noticed that your transmission is shifting much harder than normal. If your vehicle has displayed a P0865 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0886 trouble code may include:

Electronic traction control disabled
Irregular transmission shifting patterns
Transmission failure to shift
Other associated codes
ABS disabled

What are some common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle speed sensor failure
Open or shorted circuits in the CAN
Mechanical transmission failure
Defective TCM, PCM, or programming error

What are the troubleshooting steps for P0886?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0886 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code turns out to be intermittent). After that, clear the codes and test the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0886 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

Use the DVOM to test the voltage and ground circuits at the TCM and/or PCM. If no voltage is detected, check the system relay and associated fuses. Replace faulty relays and/or blown (or otherwise defective) fuses as needed.

P0886 is typically stored due to a faulty contact relay, a blown fuse link, or a blown fuse

P0887 High TCM Power Relay Control Circuit

What does P0887 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Kia, Smart, Jeep, Dodge, Ford, Dodge, Chrysler, etc. Although generic, the exact repair steps may vary by year, make, model, and powertrain configuration.

If your vehicle has stored a P0887 code, accompanied by a malfunction indicator light (MIL), it means the powertrain control module (PCM) has detected a high voltage condition in the TCM power relay control circuit.

While some transmission control modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P codes, B codes, or even U codes, depending on the vehicle’s make and model. If a P0887 code is stored, it is likely that other PCM and/or TCM codes are also stored.

The CAN is a complex wiring and connector system used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is not only used for comparison in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems. This code is unique in that it is typically only stored if other traction control system-related codes are present. These could be codes related to mechanical or electronic issues.

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily separate from the sprag so the gear ratio can be smoothly changed. One or more electronic pressure control (EPC) solenoids help regulate fluid pressure. Electronic pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

As with many other automatic transmission malfunctions, a transmission control system code can be caused by an electrical or mechanical failure. If the PCM detects a malfunction that requires the MIL to illuminate, a P0887 code will be stored and the MIL may light up.

How severe is this DTC?

Battery voltage is supplied to the TCM using one (or more) fuses and/or ignition relays. If the TCM or PCM detects insufficient voltage on the input supply (from the relay or fuse), a P0887 will be stored and the MIL will illuminate.

If this code is stored, you may have noticed your transmission shifting much harder than normal. If your vehicle has displayed a P0865 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0887 trouble code may include:

    Electronic traction control disabled
    Irregular transmission shifting patterns
    Transmission failure to shift
    Other associated codes
    ABS disabled

What are some common causes of the code?

Causes

of this code may include:

    Faulty relay or blown fuse (fuse link)
    Vehicle speed sensor failure
    Open or shorted circuits in the CAN
    Mechanical transmission failure
    Defective TCM, PCM, or programming error

What are the troubleshooting steps for P0887?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0887 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0887 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location diagrams, wiring diagrams, and diagnostic flowcharts (related to the code and the specific vehicle) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace wiring that has been cut, burned, or damaged.

P0887 is typically stored due to a faulty ignition relay, a blown fuse link, or a blown fuse

P0888 TCM Power Relay Sense Circuit

What does P0888 mean?

This diagnostic trouble code (DTC) is a generic powertrain code and applies to many OBD-II vehicles (1996-newer). This may include, but is not limited to, vehicles from Hyundai, Kia, Smart, Jeep, Dodge, Ford, Dodge, Chrysler, etc. Although generic, the exact repair steps may vary depending on the year, make, model, and powertrain configuration.

If your vehicle has stored a P0888 code, accompanied by a Malfunction Indicator Lamp (MIL), it means the Powertrain Control Module (PCM) has detected a non-specific voltage condition in the TCM power relay control circuit.

While some Transmission Control Modules (for OBD-II equipped vehicles) are integrated into the PCM, most are standalone components. TCM-related codes are stored as P-codes, B-codes, or even U-codes, depending on the vehicle’s make and model. If a P0888 code is stored, it is highly likely that other PCM and/or TCM codes are also stored.

The CAN is a complex wiring and connector system used to transmit data between the TCM and PCM. Data (including stored codes) can also be shared with other controllers via the CAN. Transmission input and output speed (RPM), vehicle speed, and wheel speed are all shared among multiple controllers. This data is not only used for comparison purposes in electronic traction control systems but also in anti-lock braking systems and electronic stability control systems. This code is unique in that it is typically only stored if other traction control system-related codes are present. These could be codes related to mechanical or electronic issues.

The electronic transmission control systems of OBD-II equipped vehicles are monitored using a network of computers (called control modules). This involves constant communication between the various control modules via the Controller Area Network (CAN).

The PCM uses input signals from multiple engine and transmission sensors to calculate the automatic shift strategy. A high-pressure pump (inside the transmission) forces fluid through the valve body and into the cam assembly; in addition to lubricating and cooling the transmission. The high-pressure fluid allows the clutches to momentarily separate from the sprag so the gear ratio can be smoothly changed. One or more Electronic Pressure Control (EPC) solenoids help regulate fluid pressure. Electronic Pressure (EP) sensors provide the PCM with relevant data regarding fluid pressure at different points in the transmission. Electronic shift solenoids are used to interrupt the flow of high-pressure fluid so the transmission shifts when commanded. The PCM uses voltage input signals from the transmission input speed sensor and transmission output speed sensor to determine if the transmission is shifting effectively.

As with many other automatic transmission malfunctions, a transmission control system code can be caused by an electrical or mechanical failure. If the PCM detects a malfunction that requires the MIL to illuminate, a P0888 code will be stored and the MIL may be illuminated.

How severe is this DTC?

Battery voltage is supplied to the TCM using one (or more) fuses and/or ignition relays. If the TCM or PCM detects insufficient voltage on the input power supply (from the relay or fuse), a P0888 will be stored and the MIL will illuminate.

If this code is stored, you may have noticed your transmission shifting much harder than normal. If your vehicle has presented a P0865 code, it should be diagnosed as soon as possible.

What are some of the symptoms of the code?

Symptoms of a P0888 trouble code may include:

Electronic Traction Control Disabled
Erratic Transmission Shifting Patterns
Transmission Failure to Shift
Other Associated Codes
ABS Disabled

What are some of the common causes of the code?

Causes of this code may include:

Faulty relay or blown fuse (fuse link)
Vehicle Speed Sensor Failure
Open or shorted circuits in the CAN
Mechanical Transmission Failure
Faulty TCM, PCM, or programming error

What are the P0888 troubleshooting steps?

You will need a diagnostic scanner, a digital volt/ohmmeter (DVOM), and a reliable source of vehicle information to accurately diagnose a P0888 code. An oscilloscope can also be very useful for diagnosing various speed sensors.

You can save time by searching for Technical Service Bulletins (TSBs) that match the stored code, the vehicle (year, make, model, and engine), and the symptoms presented. This information can be found in your vehicle information source. If you find the right TSB, it might provide a quick fix for your diagnosis.

After connecting the scanner to the vehicle’s diagnostic port and retrieving all stored codes and relevant freeze frame data, note the information (in case the code proves to be intermittent). After that, clear the codes and test drive the vehicle until one of two things happens; the code is restored or the PCM enters readiness mode.

The code may be more difficult to diagnose if the PCM enters readiness mode at this point, as the code is intermittent. The condition that caused the P0888 to be stored may need to worsen before an accurate diagnosis can be made. If the code is restored, proceed with the diagnosis.

You can obtain connector face views, connector pinout charts, component location charts, wiring diagrams, and diagnostic flowcharts (related to the code and vehicle in question) using your vehicle information source.

Perform a visual inspection of the associated wiring and connectors. Repair or replace any wiring that is cut, burned, or damaged.

P0888 is typically stored due to a faulty ignition relay, a burned fuse link, or a blown fuse.