Alternative Fuel Pump B Compression Stroke Valve Control Circuit/Open
The control circuit of the compression stroke valve in alternative fuel pump B reports a control circuit/open condition. Pump compression stroke cannot be commanded as expected.
Affected components
- Alt fuel pump b compression stroke valve
- Wiring harness
- Afcm
Common causes
- High likelihood: Open in valve control wire
- Medium likelihood: Open valve coil
- Low likelihood: Pin pushed back out of connector body
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.