P0255
Stop drivingThe engine's computer detects an intermittent fault in the fuel metering control circuit for the 'A' fuel injection pump. This means the system controlling how much fuel goes into the engine is not working consistently.
Code P0255 means your engine's fuel metering control circuit has an intermittent fault. Common causes: Wiring issues (40%), fuel metering valve (35%), injection pump (20%). Drivability: No, stop driving. Repair cost: $150-$800 DIY, $300-$1500 professional.
Can I Drive With P0255?
No, stop driving
Immediate repair needed
Stop driving immediately if: Any engine performance issues, stalling, or if the Check Engine Light is flashing.
Symptoms of P0255
- 1Engine stalls unexpectedly
- 2Engine cranks but won't start
- 3Significant loss of engine power
- 4Rough idling or misfires
- 5Engine runs erratically
- 6Increased fuel consumption
Common Causes of P0255
Parts most likely causing this code, ranked by probability
Damaged, corroded, or loose wiring and connectors in the fuel metering control circuit cause intermittent signals, triggering the code.
40% of P0255 cases are fixed by repairing wiring or connectors
The valve or actuator responsible for regulating fuel flow to the injection pump is failing intermittently, leading to inconsistent fuel delivery.
35% of P0255 cases are fixed by replacing the fuel metering control valve
An internal fault within the fuel injection pump itself, specifically with its control components, causes intermittent operation.
20% of P0255 cases are fixed by replacing the fuel injection pump
A rare internal fault within the engine's computer can incorrectly interpret or fail to control the fuel metering circuit.
5% of P0255 cases are fixed by replacing or reprogramming the PCM
Check These First (Before Buying Parts)
- Visually inspect the wiring harness and connectors leading to the fuel injection pump and the fuel metering control valve for any signs of damage, fraying, corrosion, or loose connections. Pay close attention to areas where wires might rub against engine components.
- Ensure your battery terminals are clean and tight, and the battery has a full charge. A weak battery can sometimes cause intermittent electrical issues.
How to Diagnose P0255
- 1Visually inspect all wiring and connectors leading to the fuel injection pump and its metering control valve for damage, corrosion, or looseness.
- 2Check for any obvious fuel leaks around the injection pump and fuel lines.
- 3Using a scan tool, monitor fuel pressure readings and the fuel metering control valve's commanded vs. actual position while the engine is running (if possible) or cranking.
- 4Perform a continuity and resistance test on the fuel metering control valve circuit wiring from the PCM to the valve.
- 5Test the resistance and operation of the fuel metering control valve itself, following manufacturer specifications.
- 6If all electrical checks pass, consider testing fuel pressure and volume from the low-pressure fuel pump to ensure adequate supply to the injection pump.
P0255 on Popular Vehicles
Ford F-Series (Powerstroke)
2003-2024P0255 on Powerstroke engines frequently relates to the Fuel Injection Control Module (FICM) or the fuel metering valve on the high-pressure fuel pump. Check FICM voltage and wiring carefully.
60% fixed by addressing FICM or metering valve issues
Chevrolet Silverado/GMC Sierra (Duramax)
2001-2024Duramax engines with P0255 can have issues with the CP3/CP4 fuel pump's fuel pressure regulator or the wiring to it. Corrosion in the harness connectors is a common culprit.
55% fixed by replacing FPR or repairing wiring
Ram (Cummins)
2003-2024For Cummins engines, P0255 often points to the Fuel Control Actuator (FCA) on the CP3 fuel pump or its electrical connector. Inspect the connector for damage and test the FCA's resistance.
65% fixed by replacing FCA or repairing connector
Frequently Asked Questions
What does P0255 mean?
P0255 indicates an intermittent problem with the fuel metering control circuit for your engine's 'A' fuel injection pump. This circuit is responsible for precisely regulating the amount of fuel delivered to the engine.
Can I drive with P0255?
No, stop driving. This code points to a critical issue with fuel delivery. Driving with P0255 can lead to sudden engine stalling, severe power loss, and potentially cause engine damage due to incorrect fuel mixtures. Get it fixed immediately.
Will P0255 clear itself?
No, P0255 will not clear itself. This code signifies a hard fault in a critical system. The underlying issue must be diagnosed and repaired before the code will clear, either automatically after several drive cycles or by using a scan tool.
How do I fix P0255 myself?
Start by inspecting all wiring and connectors to the fuel injection pump and its metering valve for damage. If wiring is good, you'll need a multimeter to test the circuit's continuity and the resistance of the fuel metering control valve. If the valve is faulty, replacing it is the next step. If the pump itself is failing, replacement is a more involved job.
How much does it cost to fix P0255?
DIY repair costs for P0255 typically range from $150 to $800, mainly for a new fuel metering control valve or wiring repair. Professional shop repairs can cost $300 to $1500, depending on whether it's a wiring fix, valve replacement, or a more expensive fuel injection pump replacement.
P0255 keeps coming back - why?
If P0255 keeps returning, it often means the initial diagnosis missed the root cause. Common reasons for recurrence include: an intermittent wiring issue that wasn't fully resolved, a faulty fuel metering valve that was overlooked, or a failing fuel injection pump that was not replaced. A thorough electrical diagnosis is crucial.
Will P0255 fail emissions/smog test?
Yes, P0255 will cause your vehicle to fail an emissions or smog test. The Check Engine Light will be on, and the intermittent fuel metering issue directly impacts engine combustion and emissions, preventing the vehicle from passing.
What's the difference between P0255 and P0251?
P0251 indicates a general malfunction of the 'A' fuel injection pump, meaning the pump itself isn't performing as expected. P0255 specifically points to an *intermittent* fault in the *control circuit* for that pump's fuel metering, suggesting a wiring, sensor, or actuator issue rather than a complete pump failure.
P0255 on Ford Powerstroke?
On Ford Powerstroke engines, P0255 often points to issues with the Fuel Injection Control Module (FICM) or the high-pressure fuel pump (HPFP) metering valve. Inspect the FICM harness for corrosion or damage, and test the metering valve's electrical integrity. These engines are sensitive to fuel system integrity.
Questions to Ask Your Mechanic
Did you check the wiring harness and connectors for the fuel metering control valve and injection pump for corrosion or damage?
Good answer: Yes, I performed a thorough visual inspection and tested continuity and resistance on the circuits. I found no issues with the wiring itself.
What were the live data readings for fuel pressure and fuel metering valve position when the fault occurred?
Good answer: I monitored those parameters with a scan tool. The fuel pressure dropped intermittently, and the commanded vs. actual metering valve position showed discrepancies right before the engine stalled.
Repair Cost Estimate
DIY Repair
Parts only
$150-$800
Shop Repair
Parts + labor
$300-$1500
Save $150-$700 by doing it yourself
Difficulty
intermediate
Time
2-6 hours
Professional recommended - This code requires advanced electrical diagnostic skills, a good scan tool, and potentially specialized knowledge of high-pressure fuel systems. While some basic checks are DIY-friendly, pinpointing the exact intermittent fault often requires professional expertise.
Cost of Waiting
Ignoring P0255 can lead to your engine stalling at high speeds, creating a dangerous driving situation. Continued intermittent fuel delivery can also cause severe engine damage due to lean conditions, potentially requiring costly engine rebuilds or replacement. A $150 wiring repair now prevents a $5,000+ engine repair later.
While You're In There...
A clogged fuel filter can restrict fuel flow, potentially stressing the injection pump and contributing to intermittent fuel delivery issues. It's a low-cost maintenance item often overlooked.
If you are disconnecting fuel lines to access the injection pump or metering valve, replacing the O-rings or gaskets prevents future leaks and ensures a proper seal.
Tools You'll Need
- OBD-II scan tool with live data capability
- Digital multimeter
- Wiring diagrams for your vehicle
- Basic hand tools (wrenches, sockets, screwdrivers)
- Electrical contact cleaner
P0255 is a serious code, but it's a common issue on many direct injection and diesel engines. With careful diagnosis, you can pinpoint the exact problem and get your vehicle running reliably again.
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Your Next Steps
Step 1: Perform a thorough visual inspection of all wiring and connectors related to the fuel injection pump and its metering control valve. Look for chafing, corrosion, or loose pins. Repair any damaged wiring or connectors.
Step 2: If wiring is good, use a multimeter to test the resistance of the fuel metering control valve itself. Compare readings to your vehicle's service manual specifications. If it's out of spec, replace the fuel metering control valve.
Step 3: If the valve tests good, you'll need to perform more advanced electrical diagnostics, including checking for proper voltage and ground at the valve connector, and testing continuity of the circuit back to the PCM. If all electrical checks pass, the fuel injection pump itself is the likely culprit.