Vacuum Reservoir Pressure Sensor Circuit Low
Sensor signal voltage below the lower limit — usually a short to ground or open reference. The ECM disables vacuum pump control until the input recovers.
Affected components
- Vacuum reservoir pressure sensor
- Sensor wiring
Common causes
- High likelihood: Signal wire shorted to ground
- Medium likelihood: Missing 5 V reference at the sensor
- 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.