Fuel Pump Relay Control Circuit
Issues with the fuel pump relay control circuit detected.
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What it means (plain English)
The computer is not getting the expected signals to control the fuel pump relay, which powers the fuel pump needed to get fuel to the engine.
What the computer is actually seeing
The fuel pump relay control circuit should have a certain voltage (typically around 12V when activated). If the signal dips below 9V or fails to activate, this code can set off.
What a healthy reading looks like
Voltage at the relay control should be between 12V and 14V while running. The relay should click when commanded from the PCM.
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 pump relay: Remove and test the relay using a multimeter. Look for continuity and proper operation. Decision: If the relay shows faults, replace it. If fine, move to step 2.
- 22. Inspect the wiring and connectors: Look for damage, corrosion, or loose connections in the relay circuit. Decision: If damaged, repair or replace wiring. If all is good, proceed to step 3.
- 33. Measure the voltage at the relay control pin: Connect a multimeter to the control pin of the relay while the ignition is on. Decision: Voltage should be present (12V-14V). If not, check PCM output. If voltage is present, move to step 4.
- 44. Check the ground connection for the relay: Ensure the ground is solid with continuity to the PCM ground. Decision: If ground is poor, repair the ground. If good, the PCM may be faulty.
Common causes
- Faulty fuel pump relay
- Damaged wiring in the relay circuit
- Faulty PCM (Powertrain Control Module)
- Bad ground connection to the relay
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code present?
It's not ideal, as it can lead to fuel flow issues causing stalling or no-start conditions, so address it soon.
Will this code come back after clearing?
If the underlying issue is not resolved, yes, it will likely return after clearing.
Why do I see this code along with other B codes?
Multiple B codes often indicate related electrical or control system issues affecting the same component or circuit.
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