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P2440 Secondary air injection system switching valve stuck open, bank 1

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Secondary air injection system switching valve stuck open, bank 1, readable through chat.

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System
Emissions control
Component
Secondary air switching valve

Symptoms

  • Check engine light on
  • Limp mode limiting throttle input on some trucks
  • Cold temperatures can trigger it

Common causes

  • Engine control software not the latest
  • Debris or ice in the air switching valve
  • Damaged or blocked air tube
  • Blocked or deformed vacuum hose to the pressure sensor
  • Air injection control driver or its power and wiring
  • Air pump heater circuit or pump fault

Guides for this code

Pencil sketch of a Toyota Tundra in a garage
Diagnostics & Repair

P2440 and P2442 on a 2015-2016 Toyota Tundra: Causes and Repair

JC Landry · Oct 27, 2026

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Answers come from the factory manual for your make, model and year, with the page cited. Join the waitlist and we will email you when a spot opens up.