Toyota Tundra Air Injection P2440 / P2442 Fix

By the Radman Auto Repair team, independent auto repair in Etobicoke since 1999 · Updated November 2026

The 5.7 V8 in 2007–2014 Toyota Tundras and Sequoias has a secondary air injection system that pumps air into the exhaust for a minute after a cold start to warm the catalytic converters. When the pump or switching valves fail, often from moisture, the truck sets codes and goes into limp mode.

Symptoms

What Causes It

Before You Start

• Park on level ground, set the parking brake and chock the wheels. Never work under a car held up only by a jack: use rated jack stands.
• Let the engine and exhaust cool before you touch them; coolant systems are under pressure when hot.
• Wear safety glasses and gloves, and disconnect the 12V battery before unplugging electrical parts or working near airbags.
• Check for open recalls on your VIN (Transport Canada or the manufacturer’s site) before you buy parts: a recall repair is free at the dealer.
• Work on a cold engine; the valves sit near the exhaust.

Step-by-Step: Tundra Air Injection Pump

1. Scan the codes. Read the codes and freeze-frame data.
2. Check your VIN. Ask a Toyota dealer about extended coverage for the air injection system.
3. Listen at cold start. Listen at a cold start for the pump running for about a minute.
4. Inspect the pump. The pump is behind the front bumper on the driver side; check its hoses and connector.
5. Check the valves. Check the switching valves on top of each bank for moisture and corrosion.
6. Replace the parts. Replace the pump and both switching valves, with new gaskets.
7. Clear the codes. Clear the codes so the truck leaves limp mode.
8. Cold start test. Test at the next cold start; the codes should not return.

When to Stop and Bring It In

• You have extended coverage: let the dealer do it.
• Codes return after replacing the parts.
• There are other codes or misfires.
• Bolts are seized near the exhaust. See check engine diagnosis.

Not sure, or out of time? Radman Auto Repair in Etobicoke does this repair every week. Book online or call (416) 742-4521.

Also Known As

Owners search for “Tundra limp mode”, “Tundra air injection pump”, “P2440 Tundra”, “Tundra secondary air injection” or “Sequoia P2442”. Toyota calls it the secondary air injection system.

Frequently Asked Questions

See also Toyota Repair & Service, Check Engine Light Diagnosis, Exhaust Repair, DIY Repair Guides by Manufacturer.

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