Secondary Air Injection Pump Stuck On (Bank 2)
Bank 2 secondary air pump runs continuously. Either a stuck-on relay or a shorted control output keeps the pump powered when it should be off.
Affected components
- Secondary air pump b2
- Secondary air relay
Common causes
- High likelihood: Relay stuck closed
- Medium likelihood: Driver stage shorted on
- Low likelihood: Carbon or debris buildup preventing free movement
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
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.