Alternative Fuel Rail Pressure Regulator Pressure Sensor Circuit High
Voltage on the inlet pressure sensor signal line of the alternative fuel rail pressure regulator is above the expected window. Wire shorted to B+ or sensor open.
Affected components
- Alt fuel rail pressure regulator
- Alt fuel pump
- Afcm
Common causes
- High likelihood: Signal wire shorted to B+
- Medium likelihood: Open pressure sensor
- Low likelihood: Connector pins corroded - high contact resistance
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.