Alternative Fuel Pump A Performance
The AFCM detects that alternative fuel pump A does not produce the expected pressure or flow for the commanded duty. Pump aging, internal leakage, or supply restriction.
Affected components
- Alt fuel pump a
- Alt fuel filter
Common causes
- High likelihood: Pump internal wear reduces output
- Medium likelihood: Fuel filter clogged
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
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.