Sensor Reference Voltage G Circuit Low
The 5 V reference G voltage is below the expected level. Usually a short to ground or excessive load from a downstream sensor pulling the rail down.
Affected components
- Control module
- Reference voltage rail
- Sensors on rail g
Common causes
- High likelihood: Reference wire shorted to ground
- Medium likelihood: Sensor on the rail shorted internally to ground
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
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.