P2442: Secondary Air Injection System Switching Valve Stuck Open (Bank 2)
Severity: medium
What it means: The engine computer saw exhaust pressure pulses reaching the secondary air system on bank 2 when the air switching valve should have been closed, so it judges that valve to be stuck open.
Safe to drive? Usually yes for short trips, but some Toyota V8 trucks drop into limp mode (about 25 mph per Toyota's bulletin). Get it diagnosed soon.
Common symptoms
- Check-engine light
- Limp mode on some Tundra and Sequoia V8s
- Often appears with P2440 (bank 1)
- May set after freezing weather
Likely causes, ranked
- Air switching valve stuck from moisture or carbonShop
- Failed secondary air pumpShop
- Air system pressure sensor or wiring faultShop
- Air injection control driver or ECM faultShop
Vehicle-specific notes
- :
What it means: The engine computer saw exhaust pressure pulses reaching the secondary air system on bank 2 when the air switching valve should have been closed, so it judges that valve to be stuck open.
Severity: Medium. Safe to drive? Usually yes for short trips, but some Toyota V8 trucks drop into limp mode (about 25 mph per Toyota's bulletin). Get it diagnosed soon.
DIY or shop?
Reading codes and checking connectors is DIY. Valve and pump replacement on the Tundra V8 usually means removing the intake, which is shop work for most owners.
Vehicle notes
- 2007–2010 Tundra and 2008–2010 Sequoia: Toyota extended coverage on the air injection pump and valves. 2014–2016 Tundra (1UR-FE): Toyota bulletin for P2440/P2442 in freezing weather.
Before you replace parts
- Read all stored codes, including detail (INF) codes on Toyota hybrids.
- Check your VIN for recalls, service bulletins and extended coverage.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. A code points to a circuit or system, not always a specific part.