P0255 – OBD-II DTC

OBD-II DTC P0255 – Injection Pump Fuel Metering Control “A” High (Cam/Rotor/Injector)

DTC P0255 meaning

DTC P0255 refers to a diagnostic trouble code that indicates an issue with the fuel metering control of the injection pump. Specifically, it signifies that the fuel metering control “A” circuit is experiencing a high signal condition. This can involve components such as the cam, rotor, or injectors, which are critical for regulating the amount of fuel delivered to the engine.

DTC P0255 symptoms

Common symptoms associated with DTC P0255 may include:

• Engine misfires or rough idling
• Decreased engine performance
• Increased fuel consumption
• Difficulty starting the engine
• Check Engine Light (CEL) illuminated

DTC P0255 causes

Several factors can lead to the triggering of DTC P0255, including:

• Faulty fuel injection pump
• Malfunctioning fuel metering control sensor
• Wiring issues or short circuits in the fuel metering control circuit
• Clogged fuel filters or lines
• Defective injectors

DTC P0255 seriousness

DTC P0255 is considered a serious issue as it can lead to significant engine performance problems. If left unaddressed, it may result in:

• Increased emissions
• Potential engine damage
• Failure to pass emissions tests
• Increased repair costs over time

How to diagnose DTC P0255

To diagnose DTC P0255, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P0255 code.
2. Check for any additional trouble codes that may provide more context.
3. Inspect the wiring and connectors related to the fuel metering control circuit for damage or corrosion.
4. Test the fuel injection pump and fuel metering control sensor for proper operation.
5. Examine the fuel system for clogs or restrictions.
6. Perform a visual inspection of the fuel injectors for leaks or malfunctions.

How to fix DTC P0255 step-by-step instructions

To fix DTC P0255, follow these step-by-step instructions:

1. Clear the DTC using an OBD-II scanner.
2. Inspect and repair any damaged wiring or connectors in the fuel metering control circuit.
3. Replace the fuel injection pump if it is found to be faulty.
4. Replace the fuel metering control sensor if it is malfunctioning.
5. Clean or replace clogged fuel filters and lines.
6. Test and replace defective fuel injectors as necessary.
7. Re-scan the system to ensure the DTC has not returned.

How to erase DTC P0255

To erase DTC P0255, follow these steps:

1. Connect an OBD-II scanner to the vehicle’s diagnostic port.
2. Turn on the ignition without starting the engine.
3. Navigate to the “Erase Codes” or “Clear DTCs” option on the scanner.
4. Confirm the action to clear the trouble codes.
5. Disconnect the scanner and start the engine to check if the code returns.

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