Fuel Pump Secondary Relay Circuit Low
The fuel pump relay circuit is not receiving sufficient voltage.
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 computer is not getting the right voltage from the fuel pump relay, meaning the pump might not get enough power to run properly.
What the computer is actually seeing
The engine control module (ECM) expects to see about 12 volts when the fuel pump relay is energized, but it detects low voltage (typically below 9 volts).
What a healthy reading looks like
Voltage should be around 12-14 volts at the relay when the fuel pump is on.
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 vehicle's battery voltage: should be 12-14 volts. If low, charge or replace the battery.
- 22. Inspect the fuel pump relay. Ensure it's seated properly and check for burnt contacts.
- 33. Verify the signal wire from the ECM to the relay for continuity. Should be less than 5 ohms.
- 44. Check the power and ground at the fuel pump relay: verify you have battery voltage on one terminal, and good ground on another.
- 55. Test the fuel pump: apply direct battery voltage to the pump; if it doesn't run, replace the pump.
Common causes
- Faulty fuel pump relay
- Corroded or damaged wiring
- Bad connector at the fuel pump or relay
- Weak battery or poor ground connections
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as it can lead to a no-start condition.
Will this code come back after clearing?
If the underlying issue isn't fixed, yes, it will return.
Why does this code pair with P0230?
P0230 indicates a general issue with the fuel pump relay circuit, so both codes can appear if there's a fault in the relay or wiring.
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