Vacuum Pump Control Circuit A Range/Performance
The vacuum pump control circuit is electrically intact, but the pump response does not match the model — pump runs longer than expected to reach setpoint, current draw rises (mechanically tight) or vacuum does not build at all. Aged motor brushes, dry vanes or a leaking line are typical causes.
Affected components
- Vacuum pump
- Vacuum lines
Common causes
- High likelihood: Aged motor brushes or dry vanes
- Medium likelihood: Leaking vacuum line
- 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.