Powertrain, generic (extended)

P2442 AIR System Switching Valve Stuck Open (Bank 2)

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

P2442 is the stuck-open fault of the bank 2 secondary air valve: with the pump on and the valve commanded shut, air still passes, or exhaust flows back towards the pump. Lexus applies it to the 2010–2013 GX 460 with the 1UR-FE engine; bulletin L-SB-0028-14 replaces the bank 2 air switching valve and the pump, because a damaged pump filter sheds debris. Toyota's T-SB-0033-17 does the same for the 2012 Tacoma 4.0L V6 (1GR-FE) when P2440, P2442 or P2445 are stored. Subaru lists P2442 for the 2011–2015 WRX STI. Hot exhaust gas passing an open path can melt hoses and ruin the pump, so the fault should not be left for long. Bank 1 uses P2440, the stuck-closed counterpart is P2443.

Likely causes

Bank 2 valve held open by debris from the pump filter
Valve seat or diaphragm damaged by heat or condensate
Actuator does not close the valve

Symptoms

  • Check engine lamp after a cold start
  • Pump noise or later pump failure
  • Melted or brittle air hoses

Repair estimate

DifficultyMediumDIY possible
Parts and labour€120–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

secondary air switching valvesecondary air pump

Related codes

P2440P2443P2445P0492

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.