P2555 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 the Fuel Injector Control Module circuit

How to Fix Code P2555

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)

P2555 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 the 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, the DEPM disables the crankshaft and camshaft output signal sent from the PCM to the Fuel Injector Control Module (FICM).

How severe is this DTC?

The severity of this code is moderate because if the engine coolant level drops too low, the engine may overheat and cause significant damage.

What are some symptoms of the code?

Symptoms of a P2556 fault code may include:

• Cooling system warning light illuminated
• Check engine light illuminated

What are some common causes of the code?

Causes

of this P2556 code may include:

• Faulty coolant level sensor or switch
• Open or short circuit
• Faulty or damaged wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fuse link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P2556?

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 a lot of time in the long run by pointing you in the right direction.

The second step is to locate all components associated with the engine coolant level circuit and look for obvious physical damage. Possible locations for this sensor or switch may include the coolant reservoir or overflow bottle, or the radiator. Consult a vehicle-specific repair manual to determine the location in your vehicle.

Perform a thorough visual inspection to check that the associated wiring does not have obvious defects such as scraping, rubbing, bare wires, or burn marks. 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 check the oil level safety circuit configuration and see if a fuse or fuse 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-specific technical data and service bulletins should always take priority.

How severe is this DTC?

The severity of this code is moderate because if the engine coolant level drops too low, the engine may overheat and cause significant damage.

What are some symptoms of the code?

Symptoms of a P2557 fault code may include:

• Cooling system warning light illuminated
• Check engine light illuminated

What are some common causes of the code?

Causes

of this P2557 code may include:

• Faulty coolant level sensor or switch
• Defective or damaged coolant level sensor/switch wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P2557?

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 engine coolant level circuit and look for obvious physical damage. Possible locations for this sensor or switch may include the coolant reservoir or overflow bottle, or the radiator. Consult a vehicle-specific repair manual to determine the location in your vehicle.

Perform a thorough visual inspection to check that the associated wiring shows no obvious defects such as scraping, rubbing, exposed wires, or burn marks. 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 operate 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 moderate because if the engine coolant level drops too low, the engine may overheat and cause significant damage.

What are some symptoms of the code?

Symptoms of a P2558 fault code may include:

• Cooling system warning light illuminated
• Check engine light illuminated

What are some common causes of the code?

Causes

of this P2558 code may include:

• Faulty coolant level sensor or switch
• Defective or damaged coolant level sensor/switch wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P2558?

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 engine coolant level circuit and look for obvious physical damage. Possible locations for this sensor or switch may include the coolant reservoir or overflow bottle, or the radiator. Consult a vehicle-specific repair manual to determine the location in your vehicle.

Perform a thorough visual inspection to check that the associated wiring shows no obvious defects such as scraping, rubbing, exposed wires, or burn marks. 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-specific technical data and service bulletins should always take priority.

How severe is this DTC?

The severity of this code is moderate because if the engine coolant level drops too low, the engine may overheat and cause significant damage.

What are some symptoms of the code?

Symptoms of a P2559 fault code may include:

• Cooling system warning light illuminated
• Check engine light illuminated

What are some common causes of the code?

Causes

of this P2559 code may include:

• Faulty coolant level sensor or switch
• Defective or damaged coolant level sensor/switch wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P2559?

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 engine coolant level circuit and look for obvious physical damage. Possible locations for this sensor or switch may include the coolant reservoir or overflow bottle, or the radiator. Consult a vehicle-specific repair manual to determine the location in your vehicle.

Perform a thorough visual inspection to check that the associated wiring does not show obvious defects such as scraping, rubbing, bare wires, or burn marks. Then, check the 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 the technical data and service bulletins specific to your vehicle should always take priority.

What are some of the symptoms of the code?

Symptoms of a P255A 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 P255A code may include:

• Faulty PTO sensor
• Open or short circuit in power take-off detection circuit
• Defective or damaged wiring
• Corroded, damaged, or loose connector
• Faulty fuse or fusible link (if applicable)
• Faulty PCM

What are the troubleshooting steps for P255A?

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 check for obvious physical damage. Perform a thorough visual inspection to verify that related wiring shows no obvious defects such as scraping, rubbing, exposed wires, or burn marks. 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 determine 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 vehicle-specific technical data and service bulletins should always take priority.

What are some of the symptoms of the code?

Symptoms of a P255B 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 P255B 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 P255B?

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 that related wiring shows no obvious defects such as scraping, rubbing, exposed wires, or burn marks. 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 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 P255C 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 P255C 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 P255C?

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. Under 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 that associated wiring shows no obvious defects such as chafing, rubbing, bare wires, or burn marks. Next, 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 vehicle-specific technical data and service bulletins should always take priority.

What are some of the symptoms of the code?

Symptoms of a P255D 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 P255D 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 P255D?

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. Under certain 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 that related wiring shows no obvious defects such as chafing, rubbing, exposed wires, or burn marks. 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 determine whether 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 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 P255E 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 P255E 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 P255E?

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 that associated wiring shows no obvious defects such as chafing, rubbing, bare wires, or burn marks. 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.