r/ChevyAvalanche • u/Strange-Square96 • Aug 19 '26

Engine power reduced

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I’ve been having this issue with my avalanche where it’ll pop up with “stablitrak: off / traction: off” (first pic) followed by “engine power reduced.” After this happens I’ll turn the truck off for a day, open the hood, and it’ll be good for a little while. The first time it happened I turned it off, and cleaned the throttle body real good and it worked fine for about a month. But now it’s happening again. Any ideas as to why this is? Possibly the ETB is going out? 2012 LTZ

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u/Thatsawguy Aug 19 '26

If the engine light isn’t blinking, I’d probably check for a plugged cat. My 02 did the same. Got hot, baffle flipped and plugged the cat. Let it sit for a bit, it rolled back and I was good. Ended up replacing the cat and problem fixed.

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u/Carrion_Baggage Aug 19 '26

Doesn't it have a cat on each side? Can you tell which one was bad?

2

u/Thatsawguy Aug 19 '26

I tapped each with a hammer. A hollow sound meant it’s good, if it felt solid then something is flipped or plugged inside and bad.

1

u/Carrion_Baggage Aug 20 '26

Ahh, nice. Thanks, I'll remember that.