The Lemon IndexThe valve that lets cold-start air into the bank 1 exhaust is stuck open.
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
Failed switching (check) valve. Then: failed air pump; water or carbon in the valve.
Owners named P2440 in 91 complaints to the U.S. government, most often on the Toyota Tacoma.
Models that report it most
Complaints that name P2440, by model. Raw counts, not a failure rate: popular models get more complaints. Tap a model for its years, mileage and what owners say fixed it.
P2440 by model: P2440 Toyota Tacoma (57) · P2440 Toyota Tundra (21)
Years owners report it on most: 2012 Toyota Tacoma · 2007 Toyota Tundra · 2008 Toyota Tundra · 2012 Toyota Tundra · 2011 Toyota Tundra · 2007 Toyota Sequoia
The details
What P2440 means
The valve that lets cold-start air into the bank 1 exhaust is stuck open. Exhaust moisture can then reach and damage the air pump.
Can I drive with P2440?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
48% of the owner complaints that name P2440 also say the car loses power or goes into limp mode. A complaint can describe more than one problem, so this doesn't prove the code caused it.
Common causes of P2440
- Failed switching (check) valve
- Failed air pump
- Water or carbon in the valve
A shop should confirm the cause with a scan and tests before replacing parts.
What owners describe
- Loses power or goes into limp mode: 48% of complaints
- Warning lights and electrical faults: 7% of complaints
- Stalls or shuts off: 5% of complaints
- Transmission slips or shifts hard: 3% of complaints
Share of complaints naming the code whose text also mentions each problem.
Model years that report P2440 most
2012 Toyota Tacoma (55), 2007 Toyota Tundra (13), 2008 Toyota Tundra (3), 2012 Toyota Tundra (3), 2011 Toyota Tundra (2), 2007 Toyota Sequoia (2).
Related codes
P2441 P2442 P2443 P2444 P2445 P2433 P2432 P2431
Quick answers
What does P2440 mean?
Secondary Air Injection System Switching Valve Stuck Open (Bank 1). The valve that lets cold-start air into the bank 1 exhaust is stuck open. Exhaust moisture can then reach and damage the air pump.
Can I drive with P2440?
Drive on, get it checked. You can usually keep driving. Have the code read at your next service or within a few weeks.
What causes P2440?
Failed switching (check) valve; Failed air pump; Water or carbon in the valve.
Counts: NHTSA owner complaints whose text names P2440. A complaint is an owner's report, not a diagnosis. Meanings: the standard SAE J2012 definitions in our own words; manufacturer codes only where verified for that make. General information, not repair advice for your car.