AIR System Pump Overspeed Bank 1
The secondary air injection (AIR) pump on bank 1 exceeds the calibrated maximum speed. Indicates load lost or supply voltage too high.
Affected components
- Secondary air injection pump b1
- Wiring harness
- Ecm
Common causes
- High likelihood: Pump impeller damaged - load lost
- Medium likelihood: Supply voltage above nominal
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.