Alternative Fuel Rail Pressure Regulator Inlet Pressure Too Low
The measured inlet pressure of the alternative fuel rail pressure regulator falls below the calibrated minimum. Tank near empty, pump output insufficient, or upstream restriction.
Affected components
- Alt fuel rail pressure regulator
- Alt fuel pump
- Afcm
Common causes
- High likelihood: Alt fuel tank near empty
- Medium likelihood: Alt fuel pump output low
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.