Vacuum Pump Control Circuit A Low
The electric vacuum pump control circuit reads stuck low — short to ground or low-side driver stuck on. The pump may run continuously, drawing current and overheating, until the ECM disables the channel.
Affected components
- Vacuum pump
- Wiring harness
Common causes
- High likelihood: Control wire shorted to ground
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.