Fuel Pump Secondary Circuit Performance
The ECM detects that the secondary fuel pump control circuit (typically used for high-load enrichment) does not respond as expected. Pump output, relay, or driver fault.
Affected components
- Fuel pump
- Fuel pump relay secondary
- Ecm
Common causes
- High likelihood: Secondary fuel pump relay aged
- Medium likelihood: Wiring or connector fault
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
- This code can affect emissions
- Reduced-power or limp mode may occur
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.