Secondary Air Injection System Pump Stuck Off (Bank 1)
The secondary-air pump does not run when commanded during cold start. Often a seized pump (after exhaust back-feed corroded the impeller), a blown fuse, or a failed relay.
Affected components
- Secondary air pump
- Secondary air pump relay
- Secondary air pump fuse
Common causes
- High likelihood: Pump seized by corrosion
- Medium likelihood: Pump relay failed
- Medium likelihood: Pump fuse blown
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.