Fuel Pump Secondary Circuit High
The voltage on the secondary side of the fuel pump circuit is higher than expected. Typical of a stuck relay or short to supply voltage that keeps the pump powered when it should be off.
Affected components
- Fuel pump relay
- Fuel pump wiring
Common causes
- High likelihood: Pump relay stuck closed
- Medium likelihood: Wire shorted to supply voltage
- Low likelihood: Connector pins corroded - high contact resistance
Possible symptoms
- Check engine light on
- Hard start, no start, or stalling under load
- Power loss especially at high load or rpm
- Possible long cranking time
Diagnostic notes
- The malfunction indicator lamp may illuminate
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.