Fuel Pump Primary Circuit Malfunction
There's a problem in the fuel pump circuit that powers the fuel pump.
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 getting the power it needs to work, so your engine might not get the fuel it needs to run.
What the computer is actually seeing
The Engine Control Module (ECM) detects a voltage issue in the fuel pump relay circuit. It expects to see between 9-16 volts when turning the pump on but sees either no voltage or erratic voltage levels.
What a healthy reading looks like
When the fuel pump relay is activated, the voltage at the fuel pump connector should be between 9-16 volts.
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.
- 1Check the fuse for the fuel pump and replace if blown.
- 2Test voltage at the fuel pump connector with key on. It should be 9-16 volts.
- 3Inspect fuel pump relay and replace if faulty. Use a multimeter to check continuity.
- 4Check wiring for shorts or breaks between the relay and pump.
- 5If all wiring and relays are good, test the fuel pump for operation.
Common causes
- Blown fuse for the fuel pump
- Faulty fuel pump relay
- Wiring issues in the fuel pump circuit
- Bad fuel pump
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, it can cause engine stalling or failure to start due to lack of fuel.
Will the code come back after repairs?
If repairs are done correctly and the circuit issues are resolved, it should not come back.
Why does this code sometimes pair with P0231?
P0231 indicates a similar issue with the fuel pump circuit too, often either a relay or circuit failure.
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