Vacuum Pump Control Circuit B Low
Voltage on the secondary vacuum pump control line is below the expected window. Usually a short to ground or a shorted motor winding.
Affected components
- Vacuum pump b
- Wiring harness
Common causes
- High likelihood: Control wire shorted to ground
- Medium likelihood: Internal short in 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.