Fuel Pump Secondary Circuit High
High voltage detected in the fuel pump secondary circuit.
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)
This code means there's an issue with the fuel pump's electrical circuit, often seen as too much voltage flowing where it shouldn’t be, indicating the possibility of a shorts or bad connections.
What the computer is actually seeing
The engine control module (ECM) monitors the voltage in the fuel pump circuit. If it detects voltage above expected levels (usually over 5 volts), it triggers this code.
What a healthy reading looks like
Fuel pump circuit voltage should be between 0-5 volts when inactive and may increase when activated, but should not exceed 5 volts under normal conditions.
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 wiring and connectors for damage or corrosion around the fuel pump circuit. If damaged, repair or replace it. Decision Point: Is the wiring intact? If no, repair or replace. If yes, proceed to step 2.
- 22. Measure the voltage at the fuel pump connector with the ignition on. If voltage exceeds 5 volts, proceed to step 3. Decision Point: Is the voltage normal (0-5V)? If yes, further diagnose the ECM. If no, check for short circuits to ground or power.
- 33. Inspect the fuel pump fuse for continuity. If the fuse is blown, replace it and retest. Decision Point: Did replacing the fuse resolve the issue? If yes, repair done. If no, inspect the ECM and further wiring.
Common causes
- Short circuit in the fuel pump wiring
- Faulty fuel pump
- ECM malfunction
- Corroded connectors
- Poor ground connection
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's advisable to fix it soon, especially if drivability issues occur, as low fuel pressure can lead to poor performance.
Will this code come back after I clear it?
If the underlying issue is not fixed, yes, the code is likely to reappear.
Why does this often pair with P0230?
P0230 indicates a fuel pump primary circuit issue. Both codes can signal problems with the fuel pump system.
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