Alternative Fuel Pump A Compression Stroke Valve Control Circuit High
The control circuit of the compression stroke valve in alternative fuel pump A reports a control circuit high condition. Pump compression stroke cannot be commanded as expected.
Affected components
- Alt fuel pump a compression stroke valve
- Wiring harness
- Afcm
Common causes
- High likelihood: Control wire shorted to B+
- Medium likelihood: Open valve coil
- 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
- 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.