Tundra in Limp Mode With Code P2440 or P2442? The Air Injection Pump Problem Explained

Picture this: it's a cold morning, you start your Tundra, and a minute later the check engine light comes on and the truck feels like it's towing a house. Clear the code, it drives fine. Next cold start, same thing. Welcome to one of the best-known Tundra headaches.

What the air injection system does

For about the first 1-2 minutes after a cold start, the secondary air injection system pumps fresh air into the exhaust. That extra air helps the catalytic converters heat up faster so the truck passes emissions. After that, it shuts off. It's pure emissions equipment. It doesn't make power or help the engine run.

There are pumps (one per bank on many trucks) and switching valves that open and close the air path. The weak spot, according to Tundra Headquarters, is water. Moisture collects in the pumps and kills them, and humid air from wet pumps can corrode the valves.

The codes

Which years Toyota covered (and why it's over)

• 2007-2010 Tundra and 2008-2010 Sequoia: Toyota extended coverage on the air pumps and switching valves to 10 years from first use or 150,000 miles, up from 5 years/60,000, per Tundra Headquarters (about 477,000 Tundras).
• 2011 Tundra and Sequoia: Warranty Enhancement Program ZG6 (June 2017) covered pumps, valves and the pump inlet cover for 10 years/150,000 miles, including reimbursement for owners who had already paid.
• 2012-2013 Tundra: Bulletin T-SB-0143-14 blamed debris or ice in the switching valve and fixed it with an engine computer reflash, covered under the federal emissions warranty for 8 years/80,000 miles.

Do the math and every one of those windows has closed. Even a 2013 truck put in service in 2013 aged out of the 8-year coverage years ago. So in 2026, unless a dealer offers goodwill, this one is on you.

What it costs now

Why the huge spread? Some shops replace only the failed part. Others replace both pumps and both valves at once. Tundra Headquarters recommends testing the pumps first, the way Toyota's bulletins describe, and replacing only what failed. Valves usually get replaced as a set.

How to tell what's actually wrong

• Read the exact code. A valve "stuck open" code is a different repair from a pump circuit code.
• Check the pump fuse, relay and connectors. Tundra Headquarters lists poor harness connections and a clogged intake line as causes, not just dead pumps.
• Notice when it happens. Faults on cold, wet or freezing mornings fit the water and ice story. The 2012-2013 bulletin specifically mentions ice.
• Ask for a pump test before parts. Testing first is how you avoid a $4,000 "replace everything" invoice.

About unplugging it

Some owners unplug the pumps, which reportedly sets a check engine light without limp mode. That's a workaround, not a fix, and the system is emissions equipment. Disabling it can mean failing an emissions or inspection test, and tampering with emissions equipment can break federal and state rules. If you live where trucks get inspected, plan on a real repair.

What to ask the shop

• "Did you test both pumps and both valves, and which ones actually failed?"
• "Are you using the latest updated parts?" (One TrueDelta owner paid twice because the first repair used the original design.)
• "Does the price include clearing codes and a cold-start retest?"
• "Will the dealer consider goodwill since this was a known warranty issue?"

Is it worth fixing?

Yes for most trucks. A Tundra V8 that's otherwise healthy is worth far more than this repair, and you need the system working to pass emissions where it's tested. Fix only what failed, and ask for goodwill before you pay. More Tundra help is on the Toyota Tundra page, and for no-crank trouble see our Tundra starter guide. Warranty and bulletin details checked October 14, 2026.