P2440: Secondary Air Injection System Switching Valve Stuck Open (Bank 1)
Severity: medium
What it means: The engine computer sees the secondary air injection switching valve on bank 1 staying open when it should be closed. The system pumps fresh air into the exhaust for a short time after a cold start to heat the catalytic converters.
Safe to drive? Usually yes for short-term driving, but some trucks drop into reduced power after a cold start. Get it fixed before an emissions inspection.
Common symptoms
- Check-engine light after a cold start
- Reduced power on some vehicles
- Often set with P2442, P2444 or P2445
Likely causes, ranked
- Air switching valve stuck from moisture, debris or iceShop
- Failed air injection pumpShop
- Engine computer logic (some vehicles need reprogramming)Shop
- Wiring or relay faultShop
Vehicle-specific notes
- 2012–2013 Toyota Tundra: 5.7L (3UR): Toyota bulletin T-SB-0143-14 says debris or ice in the air switching valve can set P2440 or P2442, and calls for an ECM reprogram with revised logic. · Source
- 2012–2013 Toyota Sequoia: 5.7L (3UR): same Toyota bulletin T-SB-0143-14. ECM reprogram for P2440/P2442 from debris or ice in the air switching valve. · Source
What it means: The engine computer sees the secondary air injection switching valve on bank 1 staying open when it should be closed. The system pumps fresh air into the exhaust for a short time after a cold start to heat the catalytic converters.
Severity: Medium. Safe to drive? Usually yes for short-term driving, but some trucks drop into reduced power after a cold start. Get it fixed before an emissions inspection.
DIY or shop?
Usually a shop job. Check for bulletins and Toyota warranty extensions before paying for valves or pumps.
Before you replace parts
- Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
- Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
- Clear the code only after a repair, then confirm it stays off after a few drives.
- Check your VIN for recalls and service bulletins.
Safety / mechanic note
Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.