Vacuum Pump Control Circuit B High
Voltage on the secondary vacuum pump control line is above the expected window. Typical causes are a short to battery or an open motor that lets the driver float high.
Affected components
- Vacuum pump b
- Wiring harness
Common causes
- High likelihood: Control wire shorted to a B+ supply
- Medium likelihood: Open motor winding or worn brushes
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.