The P0255: Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector) code indicates an intermittent issue in the fuel metering control system for the injection pump, specifically related to Control A. This system is crucial for regulating the amount of fuel injected into the engine, and an intermittent connection can lead to irregular fuel delivery, affecting engine performance. This issue could be caused by intermittent connections in the wiring, a faulty injection pump, or a malfunctioning Powertrain Control Module (PCM).
P0255 – Quick Overview
| Meaning | P0255: Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector) |
| Is it serious? | Yes, this code can be serious as intermittent fuel metering can cause engine performance issues, including stalling, rough idling, and potential engine damage if not addressed. |
| Possible causes | – Intermittent connection in the injection pump fuel metering control A circuit – Faulty injection pump fuel metering control A – Wiring or connector issues – Faulty PCM |
| How to diagnose? | – Inspect the injection pump fuel metering control A for intermittent operation. – Check wiring and connectors for loose or corroded contacts. – Perform a wiggle test to identify intermittent faults. – Replace or repair any faulty components. |
P0255 Meaning
The P0255: Injection Pump Fuel Metering Control A Intermittent (Cam/Rotor/Injector) code indicates that there is an intermittent issue in the circuit for the injection pump fuel metering control A. This can lead to irregular fuel delivery, causing problems such as rough idling, poor fuel efficiency, or even engine stalling. The intermittent nature of the fault makes it particularly challenging, as the issue may come and go, complicating diagnosis.
Step-by-step diagnostic guide
Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.
| Action | Description | Tools Needed |
|---|---|---|
| Check for Other Codes | Use an OBD-II scanner to check if there are any other related codes present. These might give additional clues about the problem. | OBD-II Scanner |
| Inspect the Injection Pump Fuel Metering Control A | Visually inspect the injection pump fuel metering control A for any signs of damage, corrosion, or loose connections. Ensure it is securely attached and functioning properly. | Flashlight, Safety Gloves |
| Perform a Wiggle Test | While the vehicle is running or the ignition is on, gently wiggle the wiring and connectors leading to the injection pump fuel metering control A to identify any intermittent faults. | Flashlight, Multimeter |
| Inspect Wiring and Connectors | Carefully check the wiring and connectors leading to the injection pump fuel metering control A for any signs of wear, corrosion, or breaks. Look for loose or corroded contacts that could cause intermittent operation. | Flashlight, Multimeter |
| Repair or Replace Damaged Wiring/Connectors | If any wiring or connectors are found to be loose, damaged, or corroded, repair or replace them. Ensure all connections are secure and free from contaminants. | Wire Strippers, Electrical Tape, Replacement Wires/Connectors |
| Check the PCM (Powertrain Control Module) | Inspect the PCM and its connections for any signs of damage or intermittent faults. If the PCM is suspected to be faulty, it may need reprogramming or replacement. | OBD-II Scanner, Multimeter |
| Clear the Code and Test Drive | After completing the necessary repairs, clear the P0255 code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return. | OBD-II Scanner, Vehicle Owner’s Manual |
| Recheck for Codes | After the test drive, re-scan the vehicle to ensure the P0255 code has not reappeared. If the code returns, further diagnosis may be required. | OBD-II Scanner |
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I test OBD-II scanners and make DIY Engine diagnostics guides to help you solve your car problems without having to depend on the mechanic. A lot of them will try to scam you or are just no help at all. About Juraj Lukacko