Fuel Pump Control Module Performance Problem
There's a performance issue with the fuel pump control module.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
The fuel pump isn't responding as it should. It might be running too weakly or not at all when the engine needs fuel.
What the computer is actually seeing
The engine control module (ECM) expects a certain voltage and feedback from the fuel pump control module (FPCM) during operation. If the voltage to the FPCM is outside the 0.5 to 4.5 volts range when powered on, it'll trigger the P1263 code.
What a healthy reading looks like
FPCM signal voltage should be between 0.5V (off) and 4.5V (fully operational) with a normal response time under 50 milliseconds when requesting fuel flow.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the fuel level in the tank. Ensure it's above 1/4 full to eliminate fuel starvation as an issue. If low, fill the tank and recheck for codes.
- 22. Visually inspect wiring and connectors to the fuel pump control module. Look for corrosion, damage, or loose connections. Replace or repair as needed.
- 33. Use a multimeter to check voltages at the fuel pump control module. You should see around 12V when the engine is in the 'run' position. If there's no voltage, trace wiring back to the fuse panel.
- 44. With the engine running, measure the output voltage signal from the fuel pump control module. If it's outside the 0.5V to 4.5V range, replace the module. If normal, the pump itself may be faulty.
Common causes
- Faulty fuel pump control module
- Bad connection or damaged wiring to the fuel pump
- Weak or failing fuel pump
- Low fuel level affecting pump operation
Typical repair cost
$$
Related codes
Frequently asked questions
Can I drive the vehicle with this code?
Yes, but you may experience poor engine performance, and it’s best to fix this soon to avoid stalling or misfires.
Will this code come back after resetting it?
If the issue isn’t resolved, it’s likely to return as the problem persists.
What other symptoms might I see?
You may notice engine stalling, lack of power during acceleration, or difficulty starting the engine.
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