P2445
Secondary Air Injection System Pump Stuck On (Bank 1)
The secondary-air pump continues to run after the cold-start window, when the ECU has commanded it off. Usually a stuck-closed relay welding the pump permanently to battery voltage.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Pump relay stuck closedCommon
- Drive line shorted to supplyPossible
- Carbon or debris buildup preventing free movementLess likely
Parts involved
- Secondary Air Pump
- Secondary Air Pump Relay
P2445 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.