2008 Toyota Tundra - P0418 Secondary Air Injection System Pump A Circuit

Question

My 2008 Tundra is in limp mode and it's throwing P0418. It won't let me go over about 40 MPH. This happened right after a big rainstorm. I can hear a loud vacuum cleaner sound coming from the engine bay when I first start it up in the morning, which then turns into a screeching noise.

I've checked the fuses and they look okay. I've read that these air pumps are a huge problem on the 5.7L engines and it's a super expensive fix at the dealer because they have to pull the intake manifold.

MountainMechMo · Answer

If you don't want to spend $2000 on pumps, look into a bypass kit. There are several companies that make a plug-and-play module that fools the ECU into thinking the system is working. It's for 'off-road use only' but it's a common way to deal with this P0418 headache.

CumminsCowboy · Answer

✅ Confirmed fix: The air injection pumps sucked in moisture, causing the motors to seize and the switching valves to get stuck open. Replaced both air pumps and both air switching valves. To prevent this from happening again, I installed the updated 'chimney' intake snorkels from Toyota that relocate the pump air intake to a higher, drier location in the engine bay.

2008 Toyota Tundra - P0418 Secondary Air Injection System Pump A Circuit

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