P2447: Secondary Air Injection System Pump Stuck Off (Bank 2)
Severity: low
What it means: P2447 means the engine computer told the bank 2 secondary air pump to run, but it didn't run or didn't make enough air pressure. The secondary air system blows fresh air into the exhaust after a cold start to cut emissions.
Safe to drive? Usually yes. It's an emissions fault, but it will fail an emissions test and on some Toyota/Lexus models turns on the VSC lights.
Common symptoms
- Check engine light after a cold start
- VSC, TRAC or slip lights on some Toyota/Lexus models
- Pump not heard running for the first minute after a cold start
Likely causes, ranked
- Failed secondary air pumpShop
- Blown fuse, bad relay or pump driverDIY or shop
- Stuck or water-damaged air switching valveShop
- Wiring problemShop
Advertisement
Vehicle-specific notes
- 2008–2015 Lexus LX 570: Owners report P2447 with P0419; one dealer charged $1,750 for pump, valves, driver and connector. Read the full answer · Source
DIY or shop?
Fuses and relays are DIY. Pump and valve replacement is a shop job for most owners.
Before you replace parts
- Read all codes; secondary air codes often set in pairs (pump and valve, or both banks).
- Check fuses and relays for the air pump circuit.
- Command the pump on with a scan tool or apply power to test it, and listen for it running.
- Inspect hoses and the air switching (check) valves for water, blockage or sticking.
- Check your VIN for recalls, service bulletins and extended coverage.
Safety / mechanic note
Verify with a mechanic. With VSC/traction control switched off, the vehicle has less traction help on slippery roads. A code points to a circuit or system, not always a specific part.
Advertisement