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.

P255F Possible Causes

• Low refrigerant
• Excessive refrigerant
• Faulty low pressure sensor
• Low pressure sensor side harness is open or short-circuited
• Poor electrical connection in low pressure sensor circuit

How to Fix P255F 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

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

P255F Meaning

The Powertrain Control Module (PCM) monitors refrigerant pressure through the A/C pressure sensor. The PCM provides a 5V reference and a low reference to the sensor. Changes in A/C refrigerant pressure cause the sensor signal to the PCM to vary. When pressure is high, the signal is high. When pressure is low, the signal is low. The PCM sets the OBDII code when the sensor signal falls outside factory specifications.

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 P2560 trouble code may include:

• Cooling system warning light on
• Check engine light on

What are some common causes of the code?

Causes

of this P2560 code may include:

• Low coolant level (most likely)
• An air pocket in the cooling system
• Faulty coolant level sensor or switch
• Defective or damaged coolant level sensor/switch wiring

What are the troubleshooting steps for P2560?

The first step is to simply check the coolant level. If it is actually low (which is likely), refill the coolant and monitor it closely to see if it drops again.

The second step would be 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.

If the coolant drops low and you add coolant, and it happens again and again, that indicates there is a problem. Perhaps the head gasket is faulty or there is a coolant leak somewhere.

If there is an air pocket in the cooling system, it can give you different codes like this one. If you recently changed the coolant but did not properly bleed the air from the system, do so now.

There is a slight possibility that this code is erroneous, but it is usually an informational code logged to record a low coolant level. This code may be set as a permanent code, which cannot be cleared from the vehicle’s system.

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