How severe is this DTC?

The severity of this code is generally not severe as it will likely only affect the PTO functions but not the normal functions of the vehicle.

What are some of the symptoms of the code?

Symptoms of a P254B fault code may include:

Power take-off auxiliary equipment will not operate
Check engine light illuminated

What are some common causes of the code?

Causes

of this P254B code may include:

• Faulty PTO sensor
• Defective or damaged wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P254B?

The first step in the troubleshooting process for any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and engine/transmission configuration. In some circumstances, this can save you significant time in the long run by pointing you in the right direction.

The second step is to locate all components associated with the power take-off circuit and look for obvious physical damage. Perform a thorough visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burns. Then, check connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components, including the PCM. Consult vehicle-specific technical data to verify the oil level safety circuit configuration and see if a fuse or fusible link is incorporated into the circuit.

Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. In this situation, an oil pressure gauge may facilitate the troubleshooting process.

This article is strictly informational, and your vehicle’s specific technical data and service bulletins should always take priority.

How severe is this DTC?

The severity of this code is generally not severe as it will likely only affect PTO functions but not the vehicle’s normal functions.

What are some symptoms of the code?

Symptoms of a P254C fault code may include:

Auxiliary power take-off equipment will not operate
Check engine light illuminated

What are some common causes of the code?

Causes

of this P254C code may include:

• Faulty PTO sensor
• Defective or damaged wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P254C?

The first step in the troubleshooting process for any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and engine/transmission configuration. In some circumstances, this can save significant time in the long run by pointing you in the right direction.

The second step is to locate all components associated with the power take-off circuit and look for obvious physical damage. Perform a thorough visual inspection to check the associated wiring for obvious defects such as scraping, rubbing, bare wires, or burns. Then check connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components, including the PCM. Consult vehicle-specific technical data to verify the oil level safety circuit configuration and see if a fuse or fusible link is incorporated in the circuit.

Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. In this situation, an oil pressure gauge may facilitate the troubleshooting process.

This article is strictly informational and the technical data and service bulletins specific to your vehicle should always take priority.

How severe is this DTC?

The severity of this code is generally not severe as it will likely only affect PTO functions but not the vehicle’s normal functions.

What are some symptoms of the code?

Symptoms of a P254D fault code may include:

Auxiliary power take-off equipment will not operate
Check engine light illuminated

What are some common causes of the code?

Causes

of this P254D code may include:

Faulty PTO sensor
Defective or damaged wiring
Corroded, damaged, or loose connector
Faulty fuse or fusible link (if applicable)
Faulty PCM

What are the troubleshooting steps for P254D?

The first step in the troubleshooting process for any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and engine/transmission configuration. In some circumstances, this can save significant time in the long run by pointing you in the right direction.

The second step is to locate all components associated with the power take-off circuit and look for obvious physical damage. Perform a thorough visual inspection to check associated wiring for obvious defects such as scraping, rubbing, bare wires, or burns. Then check connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components, including the PCM. Consult vehicle-specific technical data to verify the oil level safety circuit configuration and see if a fuse or fusible link is incorporated in the circuit.

Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. In this situation, an oil pressure gauge may facilitate the troubleshooting process.

This article is strictly informational and technical data and service bulletins specific to your vehicle should always take priority.

How severe is this DTC?

The severity of this code is generally not severe as it will likely only affect PTO functions but not the vehicle’s regular functions.

What are some symptoms of the code?

Symptoms of a P254E fault code may include:

Auxiliary power take-off equipment will not operate
Check engine light illuminated

What are some common causes of the code?

Causes

of this P254E code may include:

Faulty PTO sensor
Defective or damaged wiring
Corroded, damaged, or loose connector
Faulty fuse or fusible link (if applicable)
Faulty PCM

What are the troubleshooting steps for P254E?

The first step in the troubleshooting process for any malfunction is to search for Technical Service Bulletins (TSBs) for the specific vehicle by year, model, and engine/transmission configuration. In some circumstances, this can save significant time in the long run by pointing you in the right direction.

The second step is to locate all components associated with the power take-off circuit and look for obvious physical damage. Perform a thorough visual inspection to check associated wiring for obvious defects such as scraping, rubbing, bare wires, or burns. Then check connectors and connections for security, corrosion, and damaged pins. This process should include all wiring connectors and connections to all components, including the PCM. Consult vehicle-specific technical data to verify the oil level safety circuit configuration and see if a fuse or fusible link is incorporated in the circuit.

Advanced Steps

Advanced steps become very vehicle-specific and require appropriate advanced equipment to perform accurately. These procedures require a digital multimeter and vehicle-specific technical references. In this situation, an oil pressure gauge may facilitate the troubleshooting process.

This article is strictly informational and technical data and service bulletins specific to your vehicle should always take priority.

P254F Possible Causes

• Faulty engine hood switch
• Engine hood switch wiring harness is open or short-circuited
• Poor electrical connection in the engine hood switch circuit

How to Fix P254F Code

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

Possible Symptoms

Engine light on (or service engine soon warning light)

P254F Meaning

The Powertrain Control Module (PCM) monitors the signal from the engine hood switch circuit. The PCM sets the OBDII code when the engine hood switch signal is outside factory specifications.

P2550 Possible Causes

• Faulty Engine Control Module (ECM)
• Faulty Transmission Control Module (TCM)
• Engine Control Module (ECM) software update
• Transmission Control Module (TCM) software update
• Engine Control Module (ECM) harness is open or shorted
• Poor electrical connection in Engine Control Module (ECM) circuit

How to Fix Code P2550

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.

Possible Symptoms

Engine Light On (or Service Engine Soon Warning Light)

P2550 Meaning

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding base ignition timing and notifying the TCM that the request was successful. If the ECM is unable to comply with the request, the ECM sends the TCM a message indicating the request failed.
The torque reduction request is sent to the ECM via a communication network called CAN (Controller Area Network). Two circuits are used to communicate CAN data between the ECM and TCM.
A fault in the CAN will not cause the ECM to set Diagnostic Trouble Codes (DTCs). If a CAN fault occurs, other DTCs will be set before this code.
The ECM sets the OBDII code when the TCM receives a torque reduction failure message from the ECM.

P2551 Possible Causes

• Faulty Engine Control Module (ECM)
• Faulty Transmission Control Module (TCM)
• Engine Control Module (ECM) software update
• Transmission Control Module (TCM) software update
• Engine Control Module (ECM) harness is open or shorted
• Poor electrical connection in Engine Control Module (ECM) circuit

How to Fix Code P2551

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.

Possible Symptoms

Engine Light On (or Service Engine Soon Warning Light)

P2551 Meaning

To improve shift feel, the Transmission Control Module (TCM) may request that the Engine Control Module (ECM) reduce engine torque during shift events. When such a request is received, the ECM responds by retarding base ignition timing and notifying the TCM that the request was successful. If the ECM is unable to comply with the request, the ECM sends the TCM a message indicating the request failed.
The torque reduction request is sent to the ECM via a communication network called CAN (Controller Area Network). Two circuits are used to communicate CAN data between the ECM and TCM.
A fault in the CAN will not cause the ECM to set diagnostic trouble codes (DTCs). If a CAN fault occurs, other DTCs will be set before this code.
The ECM sets the OBDII code when the TCM receives a torque reduction failure message from the ECM.

P2552 Possible Causes

• Faulty Fuel Injector Control Module (FICM)
• Faulty Powertrain Control Module (PCM)
• Fuel Injector Control Module harness is open or shorted
• Poor electrical connection in Fuel Injector Control Module circuit

How to Fix Code P2552

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.

Possible Symptoms

Engine Light On (or Service Engine Soon Warning Light)

P2552 Meaning

The DEPM (Diesel Engine Power Monitor) strategy resides in the Transmission Control Module (TCM) located inside the Powertrain Control Module (PCM). The function of DEPM is to monitor engine RPM when there is no power demand from the Accelerator Pedal Position (APP) sensor.

During normal engine idle operation, the DEPM RPM value should always be higher than the engine RPM. If the engine RPM does not exceed the DEPM limit, DEPM disables the crankshaft and camshaft output signal sent from the PCM to the Fuel Injector Control Module (FICM).

P2553 Possible Causes

• Faulty Fuel Injector Control Module (FICM)
• Faulty Powertrain Control Module (PCM)
• Open or short circuit in Fuel Injector Control Module wiring harness
• Poor electrical connection in Fuel Injector Control Module circuit

How to Fix Code P2553

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.

Possible Symptoms

Illuminated engine light (or service engine soon warning light)

P2553 Meaning

The DEPM (Diesel Engine Power Monitor) strategy resides in the Transmission Control Module (TCM) located inside the Powertrain Control Module (PCM). The function of DEPM is to monitor engine RPM when there is no power demand from the Accelerator Pedal Position (APP) sensor.

During normal engine idle operation, the DEPM RPM value should always be higher than the engine RPM. In cases where engine RPM does not exceed the DEPM limit, DEPM disables the crankshaft and camshaft output signal sent from the PCM to the Fuel Injector Control Module (FICM).

P2554 Possible Causes

• Faulty Fuel Injector Control Module (FICM)
• Faulty Powertrain Control Module (PCM)
• Fuel Injector Control Module harness is open or shorted
• Poor electrical connection in Fuel Injector Control Module circuit

How to Fix Code P2554

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.

Possible Symptoms

Engine Light On (or Service Engine Soon Warning Light)

P2554 Meaning

The DEPM (Diesel Engine Power Monitor) strategy resides in the Transmission Control Module (TCM) located inside the Powertrain Control Module (PCM). The function of DEPM is to monitor engine RPM when there is no power demand from the Accelerator Pedal Position (APP) sensor.

During normal engine idle operation, the DEPM RPM value should always be higher than engine RPM. If engine RPM does not exceed the DEPM limit, DEPM disables the crankshaft and camshaft output signal sent from PCM to Fuel Injector Control Module (FICM).