P2A79 — Alternative Fuel Hydraulic Pump Pressure Sensor Circuit Intermittent/Erratic
The alternative fuel hydraulic pump pressure sensor signal drops out or jumps intermittently. Loose connector or noisy ground.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Alt fuel hyd pump pressure sensor
- Wiring harness
- Afcm
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Sensor connector not seated
- Noisy ground reference
- Connector with intermittent contact under vibration
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- Reduced-power or limp mode may occur
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
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.