Vacuum Pump Control Circuit A High
The vacuum pump control circuit reads stuck high — short to battery voltage or open coil/return. The driver cannot pull the line low to start the pump.
Affected components
- Vacuum pump
- Wiring harness
Common causes
- High likelihood: Control wire shorted to battery voltage
- Medium likelihood: Open pump motor winding
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.