The DTC P0924 is recorded when the computer detects an open circuit related to the gear shift reverse actuator. This is often caused by an electrical issue and should be resolved immediately.

How severe is the code?

If there is an electrical problem in the gear shift reverse actuator circuit, several transmission issues may occur, such as erratic shifting and the inability to engage or disengage reverse gear. Therefore, a diagnostic code P0924 is obviously quite serious.

Symptoms

Symptoms of a P0924 include:

• Erratic transmission behavior
• Difficulty shifting into or out of reverse gear

Causes

• Damaged wiring or connectors
• Faulty reverse actuator
• Damaged gear guide rail
• Damaged shift shaft
• Internal mechanical issues within the transmission
• ECU/TCM problems or failure

How to diagnose the code?

To determine what is causing an OBDII fault code P0924, your mechanic will need to check all electrical wiring, connectors, fuses, and relays in this circuit. The gear guide rail and shift shaft should also be inspected for signs of damage and misalignment. The gear shift reverse actuator itself will need troubleshooting to determine if it has failed. There could also be an internal mechanical failure to blame, or it might be an issue with the ECU or TCM.

What repairs will fix P0924?

• Repair or replace any damaged wiring or connectors
• Replace the gear shift reverse actuator
• Repair or replace the gear guide rail
• Repair or replace the shift shaft
• Fix internal mechanical defects
• Reprogram or replace the ECU/TCM

Related codes

P0920 – Forward shift actuator circuit/open
P0921 – Forward shift actuator circuit range/performance
P0922 – Forward shift actuator circuit low
P0923 – Forward shift actuator circuit high
P0925 – Gear shift reverse actuator circuit range/performance
P0926 – Gear shift reverse actuator circuit low
P0927 – Gear shift reverse actuator circuit high

Definition of Code P0925

The diagnostic trouble code P0925 detects a problem with the gear shift reverse actuator circuit.

What does code P0925 mean?

Code P0925 is a generic OBD-II trouble code that indicates an issue with the transmission reverse gear actuator circuit. The gear shift reverse actuator is responsible for shifting the transmission into reverse. When the Powertrain Control Module (PCM) or Engine Control Module (ECM) detects an abnormal voltage reading in the gear shift reverse actuator circuit, the P0925 trouble code will be triggered.

What causes code P0925?

Several different issues can lead to the P0925 trouble code being triggered:

• Faulty reverse gear actuator
• Mechanical problems in the transmission
• Defective reverse guide rail or shift shaft
• In rare cases, a faulty PCM, ECM, or transmission control module
• Damaged electrical components in the system, such as shorted wires or corroded connectors

What are the symptoms of code P0925?

The P0925 trouble code will likely be accompanied by the Check Engine light illuminated on the instrument cluster. The vehicle will also likely have trouble shifting into or out of reverse, or may refuse to do so entirely. Reduced fuel efficiency is also common.

How does a mechanic diagnose code P0925?

Code P0925 will be diagnosed using a standard OBD-II trouble code scanner. A reputable technician may use the scanner’s freeze frame data to assess the P0925 code and also look for any additional trouble codes that are present. If multiple codes are present, they should be addressed in the order they appear. The mechanic will then reset the trouble codes, restart the vehicle, and check if the code returns. If the P0925 code disappears, it was likely triggered incorrectly or represents an intermittent issue.

If the code returns, the mechanic should begin with a visual inspection of all electrical components in the system. Any damaged wires, connectors, fuses, or circuits will need to be replaced. Next, the mechanic will perform a thorough inspection of the gear shift reverse actuator, as well as the guide rail and shift shaft.

If the issue is still not resolved, a more in-depth inspection of the entire transmission system will be necessary.

Whenever a component is replaced during inspection and repairs, the mechanic should reset the trouble codes and restart the vehicle to see if the code returns. By doing this, the mechanic can know as soon as the problem is fixed.

Common mistakes when diagnosing code P0925

The most common mistake when diagnosing code P0925 comes from not following the OBD-II trouble code diagnostic protocol. Mechanics must adhere to the step-by-step protocol at all times to ensure their inspection and repair are as effective and efficient as possible. Failing to do so can result in addressing codes in the wrong order, missing a relatively simple fix, or not clearing the codes.

How severe is code P0925?

A vehicle with the P0925 trouble code can still be driven, although reverse gear may not be usable. If the car is driven with a detected P0925 code, severe transmission damage is at risk. For both of these reasons, the code should be addressed as soon as it is detected.

What repairs can fix code P0925?

Some repairs for code P0925 include:

• Replacing the gear shift reverse actuator
• Adjusting or replacing the reverse guide rail or shift shaft
• Replacing electrical components in the system
• Replacing the PCM, ECM, or transmission control module

When you shift your vehicle into reverse, a series of sensors informs the computer which gear you have selected. It then powers an electric motor to move the transmission into that gear. A DTC P0926 is logged when the ECU detects an abnormally low voltage signal on the gear shift reverse actuator circuit.

How severe is the code?

The diagnostic code P0926 is quite serious, as these transmission issues can actually prevent you from shifting into reverse or cause reverse to disengage.

Symptoms

Symptoms of a P0926 include:

> Transmission begins to operate erratically
> It becomes difficult to shift into reverse or to stay in reverse

Causes

• Damage to wiring and/or connectors
• Faulty reverse actuator
• Faulty gear guide rail
• Faulty shift shaft
• Internal mechanical issues
• ECU/TCM problems or failure

How to diagnose the code?

The first step in diagnosing an OBDII P0926 fault code is to check all cables, connectors, fuses, and relays on this circuit. The gear shift reverse actuator will also need to be tested. The gear guide rail and shift shaft should also be inspected for any signs of damage and misalignment. If no issues are detected so far, further diagnostics of the transmission itself, as well as the ECU and TCM, must be performed.

What repairs will fix P0926?

• Repair or replace any damaged wiring or connectors
• Replace the gear shift reverse actuator
• Repair or replace the gear guide rail
• Repair or replace the shift shaft
• Repair internal mechanical faults
• Reprogram or replace the ECU/TCM

Related Codes

P0920 – Gear Shift Forward Actuator Circuit/Open
P0921 – Gear Shift Forward Actuator Circuit Range/Performance
P0922 – Gear Shift Forward Actuator Circuit Low
P0923 – Gear Shift Forward Actuator Circuit High
P0924 – Gear Shift Reverse Control Circuit/Open
P0925 – Gear Shift Reverse Actuator Circuit Range/Performance
P0927 – Gear Shift Reverse Actuator Circuit High

The P0927 error code indicates that the Engine Control Module (ECM) has detected a problem in the operation of the transmission gear shift reverse actuator. The gear shift reverse actuator controls how a vehicle’s transmission shifts into reverse.

What does the P0927 code mean?

In simple terms, the OBD-II fault code P0927 means that the ECM has found a signal indicating that the voltage in the gear shift reverse actuator was above normal parameters.

This voltage anomaly can be caused by a malfunction of the guide rail or the shift shaft corresponding to reverse gear in the transmission, making it difficult or impossible to shift into reverse.

What causes the P0927 code?

Although several issues can trigger a higher-than-normal reading in the reverse actuator circuit, causing the Check Engine light to illuminate on a vehicle’s dashboard, the cause of the code is likely due to a mechanical problem in the transmission.

What are the symptoms of the P0927 code?

• When the P0927 code causes the Check Engine light to come on, the following symptoms may be present:
•     Difficulty or inability to shift into reverse
•     Reduced energy efficiency

How does a mechanic diagnose the P0927 code?

A certified technician must first verify the existence of the P0927 code with a specialized scan tool before proceeding further. Several scans may be necessary to determine if the problem is intermittent or constant, along with other tests, including a visual inspection.

Common mistakes when diagnosing the P0927 code

After recording the P0927 code, a technician may make the following errors:

    Not checking that the voltage through the gear shift reverse actuator is high
    Failing to visually inspect the transmission, especially components related to reverse gear
    Forgetting to clear the OBD-II P0927 error code once the problem is resolved

How severe is the P0927 code?

A vehicle registering the P0927 code may still be drivable, although it may not shift into reverse easily or at all. Over time, this issue can affect the operation of other parts and systems, so it is advisable to promptly contact a qualified mechanic for assistance in diagnosing and repairing the root cause of the P0927 code being recorded.

What repairs can fix the P0927 code?

• After a qualified mechanic has used a specialized scan tool to verify the existence of the P0927 code, the vehicle may need the following repairs:
•     Adjustment of the guide rail or shift shaft corresponding to reverse gear
•     Replacement of the entire transmission
•     Replacement of the ECM in rare cases

To prevent an unintentional rollback situation, modern vehicles are equipped with what is called a gearshift lock solenoid. When the computer detects that all conditions are met (foot on the brake pedal, gearshift lever lock button pressed) to safely move the vehicle out of park, the gearshift lock solenoid releases and allows the transmission to shift into gear. A DTC P0928 means there is an electrical issue in the control circuit of this solenoid.

How severe is the code?

Obviously, a diagnostic code P0928 is quite serious, as it likely means you will not be able to drive your vehicle.

Symptoms

Symptoms of a P0928 include:

    Transmission cannot shift out of park

Causes

•     Low or dirty transmission fluid
•     Low battery voltage
•     Bad fuse(s) or fuse link(s)
•     Damaged wiring or connectors
•     Gearshift lock solenoid
•     Faulty brake light switch

How to diagnose the code?

Diagnosing an OBDII P0928 fault code should begin with a thorough inspection of the wiring and connectors related to the gearshift lock solenoid (there may be a short circuit or liquid damage if something was spilled around the gearshift lever). Battery voltage, fuses, fuse links, and relays should also be tested. The brake light switch must also be considered, along with the condition of the transmission fluid.

What repairs will fix P0928?

•     Change transmission fluid/filter
•     Charge or replace the battery
•     Replace any blown fuse or fuse link
•     Replace any damaged wiring or connector
•     Replace the gearshift lock solenoid
•     Replace the brake light switch

Definition of Code P0929

Code P0929 is a generic powertrain code related to the transmission, including pressure faults and sensor failures. In this case, the transmission control module has detected a fault in the shift lock solenoid circuit.

What does code P0929 mean?

A vehicle with an automatic transmission uses the shift lock solenoid to ensure that your vehicle cannot be moved out of “Park” without the brake pedal being pressed. When the vehicle’s engine is “on” and the brake pedal is fully depressed, the shift lock solenoid allows the vehicle to shift from “Park” to “Reverse” or “Drive”.
When the engine control module (ECM) detects an abnormal voltage reading or signal from the shift lock solenoid, a code P0929 may be stored.

What causes code P0929?

Several issues can cause a code P0929, including:

• Low transmission fluid
• Dirty transmission fluid
• Low battery voltage
• Damaged or corroded electrical wiring to or from the shift lock solenoid
• Damaged or faulty shift lock solenoid
• Damaged or faulty brake light switch
• Damaged or faulty ECM (rare)

What are the symptoms of code P0929?

Symptoms of a code P0929 may include:

• Check engine or warning light may illuminate
• The vehicle will not shift out of park

How does a mechanic diagnose code P0929?

A mechanic may use several methods to diagnose a P0929 fault code, including:

• Using an OBD-II scanner to check for a stored P0929 fault code
• Checking the transmission fluid level
• Checking the quality of the transmission fluid
• If the transmission fluid is dirty, check the transmission pan for signs of clutch debris or other contaminants
• Checking battery voltage/charge
• Visually inspecting wiring and the electrical system for any obvious signs of damage or wear
• Checking for blown fuses
• Testing the shift lock solenoid for continuity
• Testing the brake light switch for continuity

Common mistakes when diagnosing code P0929

A common cause of a P0929 fault code is a faulty brake light switch, which will not allow the vehicle to shift out of park. The fuse that controls the brake light switch and shift lock may have blown and should be diagnosed before performing any further repairs or replacements.

How severe is code P0929?

Since safely operating a vehicle will most likely be affected due to faults that store a P0929 code, this code is considered a potentially serious one. When this code appears, it is recommended to bring your vehicle to your local service center or a mechanic immediately for repair and diagnosis.

What repairs can fix code P0929?

Several repairs can correct a P0929 fault code and include:

• Fill transmission fluid to manufacturer-recommended levels
• Change transmission fluid (if necessary)
• Charge or replace the vehicle battery
• Replace any damaged or blown fuses
• Repair or replace the damaged or faulty brake light switch
• Repair or replace the damaged or faulty shift lock solenoid
• Clear all codes, test the vehicle, and rescan to see if any codes reappear

P092A Possible Causes

• Faulty gear shift lock solenoid
• Gear shift lock solenoid wiring harness open or shorted
• Poor electrical connection in gear shift lock solenoid circuit

What Does It Mean?

First diagnose the P092A code

Check the “Possible Causes” listed above. Visually inspect related wiring harnesses and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P092A Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P092A Description

The Transmission Control Module (TCM) monitors the gear shift lock solenoid. The TCM sets the OBDII code when the gear shift lock solenoid does not meet factory specifications.

P092B Possible Causes

    Faulty gear shift lock solenoid
    Gear shift lock solenoid harness is open or shorted
    Poor electrical connection in gear shift lock solenoid circuit

 

What Does It Mean?

First diagnose code P092B

    Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

P092B

Possible Symptoms

    Check engine light illuminated (or service engine soon warning light)

P092B Description

The Transmission Control Module (TCM) monitors the gear shift lock solenoid. The TCM sets the OBDII code when the gear shift lock solenoid does not meet factory specifications.
OBDII Code P092B – Gear Shift Lock Solenoid/Actuator Control Circuit Range/Performance

Introduction

Error code P092C is an OBD-II code that indicates a problem with the shift lock solenoid or actuator “B” control circuit. This issue is typically caused by a detected low voltage in the circuit, which can prevent smooth gear shifting.

Possible Causes

Several factors can cause the P092C code:

• Faulty shift lock solenoid or actuator
• Damaged or short-circuited wiring harness
• Corroded or improperly connected connector
• Problem with the Transmission Control Module (TCM)

Symptoms

Symptoms associated with code P092C include:

• Difficulty shifting into certain gears
• Irregular or delayed gear shifting
• Illumination of the check engine light
• Activation of limp mode preventing certain gear shifts

Diagnosis and Repair

1. Visual Inspection: Check connectors and wiring for any damage or improper connections.
2. Solenoid/Actuator Testing: Use a multimeter to measure the component’s voltage and resistance to verify proper operation.
3. Electrical Circuit Check: Verify the solenoid’s supply voltage and look for any electrical anomalies.
4. Replacement of Faulty Components: If the solenoid, wiring harness, or control module is defective, replace it according to manufacturer recommendations.

Conclusion

Codes P2009 and P092C indicate problems affecting engine and transmission performance. Thorough inspection and accurate diagnosis help identify and resolve these issues to ensure proper vehicle operation.

P092D Possible Causes

• Faulty gear shift lock solenoid
• Gear shift lock solenoid harness is open or shorted
• Poor electrical connection in the gear shift lock solenoid circuit

What Does It Mean?

How to Fix Code P092D

Check the “possible causes” listed above. Visually inspect the related wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.

P092D Possible Symptoms

Check engine light illuminated (or service engine soon warning light)

P092D Meaning

The Transmission Control Module (TCM) monitors the gear shift lock solenoid. The TCM sets the OBDII code when the gear shift lock solenoid does not meet factory specifications.