Secondary air pump codes

How its codes differ

• P2440 (bank 1) and P2442 (bank 2) mean a switching valve seems to be stuck open. The valve is the part named in the code, but a failed pump is part of the story: Toyota and Lexus bulletins tie these codes to moisture in the pump or a damaged pump filter.
• The pump and valves damage each other. A valve that no longer closes lets exhaust condensate reach the pump, and a pump that breaks up inside can send debris into the valves, so when one fails the other should be checked too.
• Both banks setting together after a freezing night points more toward ice in the valves or engine computer logic than toward a failed pump; Toyota fixed several of these with a software update.

Codes

• P2440

  Secondary air switching valve stuck open (bank 1)

  Severity: Monitor

• P2442

  Secondary air switching valve stuck open (bank 2)

  Severity: Monitor

Signs it's failing

• Check engine light with P2440 or P2442
• Scratching or whistling noise from the pump for the first minute or two after a cold start
• Pump that no longer runs at all on a cold start
• On some 2014–2016 Tundra and GX 460 trucks, reduced power with throttle limited to about 25 mph

How to test it

1. Read all stored codes and the freeze-frame data, and note whether the code set after a cold night and whether both banks are stored. (Low risk)

2. Ask a dealer to check the VIN for engine computer updates and secondary air bulletins before replacing parts. (Low risk)

3. Running the pump and valves with a scan tool's active test, measuring pump current and checking the valves for exhaust leaking back are jobs for a shop. (Best left to a shop)

   Warning: The test is done with the engine running and the parts sit next to the exhaust, which gets hot enough to cause serious burns. Run the engine only outdoors or with exhaust extraction, and keep clear of the fan and belts.

After the repair

• If the pump failed, make sure the switching valves were checked too, and the other way round.
• Confirm any engine computer update from a bulletin was done.
• Clear codes only after the repair, then drive normally over several days including cold starts so the secondary air monitor can run; clearing codes or disconnecting the battery resets the readiness monitors to not ready, which fails an emissions test.