Why does my 04 Sierra Denali stop accelerating while im on the freeway and on the console it says "reducing power to engine"?

Asked by Nov 25, 2013 at 01:22 AM about the 2004 GMC Sierra 1500 4 Dr Denali AWD Extended Cab SB

Question type: Maintenance & Repair

When "Reducing power to engine pops up on the console, the accelerator doesn't work
so i pull over and turn off the trucks engine and wait a minute and the truck goes back
to normal. At first the Check Engine light would go on then turn off but now its stayed
on. I had the truck hooked up to the computer and they cant find the problem. I've
heard that i have to change the trucks computer?? By the way my truck is the
Quadrasteer Sierra Denali 2004..

2 Answers


If the computer detects a problem in the throttle system it will not allow the engine to accelerate and will show reduced power and possibly set a check engine light. Clean the throttle body of carbon and you should be good to go. www.youtube.com has a couple videos walking you through it.

1 of 1 people found this helpful.

Tom's answer is good. You need to see if you can get a code from the check engine light, try auto zone for a free reading, or buy a service manual and learn how to check it yourself.

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