Injection Pump Fuel Metering Control A Intermittent
The P0255 code indicates an intermittent fault in the fuel metering control circuit of the injection pump, specifically related to the cam, rotor, or injector components. This typically points to a problem with the fuel metering solenoid or actuator within the injection pump, which controls fuel delivery based on engine demand. Intermittent issues can be caused by wiring harness chafing, loose connectors, or internal pump wear, leading to erratic fuel metering and performance issues.
01. Most Common Causes
- Faulty fuel metering solenoid/actuator
- Wiring or connector issues in the metering control circuit
- Internal injection pump wear or contamination
- ECU software or hardware malfunction
02. Symptoms You Will Notice
- Check Engine Light on
- Engine hesitation or surging
- Hard starting or stalling
- Reduced fuel economy and power
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data to identify conditions when the fault occurred.
Step 2: Visually inspect the injection pump wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the fuel metering solenoid resistance and compare to manufacturer specifications.
Step 4: Check for proper voltage and ground at the solenoid connector with the engine running.
Step 5: If wiring and solenoid test OK, suspect internal pump failure and perform a pump flow/pressure test.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as intermittent fuel metering can cause stalling or loss of power, leading to unsafe driving conditions.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary: wiring repairs may be under $200, while injection pump replacement can exceed $1,000.