Vacuum Pump Control Circuit B Range/Performance
The secondary vacuum pump does not produce the expected vacuum within the commanded run time. Leak in the pump line or worn pump diaphragm reduces output.
Affected components
- Vacuum pump b
- Vacuum lines
- Vacuum sensor
Common causes
- High likelihood: Worn diaphragm or vanes inside the pump
- Medium likelihood: Cracked vacuum hose or loose connection
- Low likelihood: Sensor element aged beyond calibration window
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.