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R.J. wrote at 2006-09-16 22:49:09
I told earlier of replacing the throttle body sensor as a result of getting a check engine light and a readout on the Driver Info Center of "Reduced Engine Power." I then said a few thousand miles later I got the same problem. This time, it was a wire that had come loose in the throttle body sensor, so they replaced the wiring assembly and the harness for the throttle body sensor, and all is well again.



The Reduced Engine Power is actually a safety feature on many GM vehicles now. The way I understand it to be, it allows you to be able to take your vehicle safely to a service center of some sort, rather than being simply stalled somewhere. "Reduced Engine Power" can be any number of things, including, but not limited to, the throttle body assembly, coolant system/fluid, etc.


Equinox wrote at 2007-08-09 21:41:37
R.J. Maybe that's GM's spin, but in reality this "Reduced Engine Power" issue is NOT a safety feature. It's flat out dangerous! I have experienced this on a fast moving freeway, where I found myself desperately trying to make my way to the shoulder at a very slow moving pace and another time heading up a mountain road with no turnout and impatient drivers behind. In either situation, I didn't feel too safe. This was someone's design decision that sooner or later may end up as a big financial liability for GM.


trevor wrote at 2007-11-05 02:00:37
I have a 2003 chevy tahoe and I had the same problem.

This message is supposed to prevent over heating.

In my case I had to replace a few grouning wires and other wiring. This solved the problem. I have heard of other cases where the entire throttle assemply had to be replaced.




Ty wrote at 2008-09-12 13:22:56
Well I just went through this two days ago. And it was my 05 Chevy Truck not having any oil. Try a oil change.


Jack wrote at 2010-06-30 19:57:02
2003 Suburban  Had the reduce engine power warning come up on my Suburban, and yes it can be a problem when you suddenly lose power and speed in traffic.  Dealer is replacing the throttle body assembly, $695 repair.  Hoping this solve the problem, really do not want to have the engine power reduced again while under way.


unknown wrote at 2010-12-21 02:34:01
I had the same thing happen to me, i drive an 03' Tahoe.  It has been cold lately so, I've started the truck up and let it run for at least 5 minutes in the morning, but it will sometimes, stall, like want to stop on it's own when I come to a stop.  A couple times I've pressed the accelerator and nothing will happen, instead I start to go slowing backward.  When this has happen I have to put it in park and shut the engine off, then restart.  Then just recently today, I was getting ready to drive home, when I started the truck "reduced engine power" appeared on the dash.  When driving down the road, I couldn't accelerate, or it would take 5 minutes to get from 20 - 40mph.  What is this from? I need HELP.I then began to think that the engine was overheating??


tezski wrote at 2013-01-20 20:01:14
Hey. I have an 04 model and I went an bought a new fuel pump relay fuse(the wrong one) hook the battery back up and that's when I notice the check engine warning light along with the fish bowl symbol u describe (in which by the way is ur stability traction control sign) and it also read egine power reduced. I went and got the right one(take out and match up to the exact one in which they will as u regular gas or flexfuel) flexfuel is either or but if that's the one need then get it, trust me a couple extra bucks will save u a trip back. After putting the right new one in I reset everything by hooking back up the ground battery cable and they went off. So check and see if u need a new fuel pump relay. AND if so make sure to unhook ground before removing fuel pump relay fuse located in fuse box under the hood check manual. Also it could be ur carburetor is going bad. Check both. Goodluck


tezski wrote at 2013-01-20 20:01:57
Hey. I have an 04 model and I went an bought a new fuel pump relay fuse(the wrong one) hook the battery back up and that's when I notice the check engine warning light along with the fish bowl symbol u describe (in which by the way is ur stability traction control sign) and it also read egine power reduced. I went and got the right one(take out and match up to the exact one in which they will as u regular gas or flexfuel) flexfuel is either or but if that's the one need then get it, trust me a couple extra bucks will save u a trip back. After putting the right new one in I reset everything by hooking back up the ground battery cable and they went off. So check and see if u need a new fuel pump relay. AND if so make sure to unhook ground before removing fuel pump relay fuse located in fuse box under the hood check manual. Also it could be ur carburetor is going bad. Check both. Goodluck


DWickEd wrote at 2014-01-29 15:51:32
I will will stay with the engine reduced power message i was receiving for the longest time, i ended up with cleaning the throttle body while it was intact to motor as described on youtube.. With that done my engine quit having rough idle, it quit dying on me, the message went away and engine power was restored. Also my battery voltage/amp meter on dash went up to the normal 14 mark.  However i was using walmart batteries at the time, and they dont last long once the truck drains them. few months later i get the message again, and truck would putts along, until i pulled over stopped the motor and opened up my truck door and close it to reset the cpu. 2 days ago i went and got an interstate battery with 800 ccc and the gauge is almost pegged out at 18 or 19, still didnt help me.  Yesterday i took it to get an oil change, and instantly the check engine light went off, i post again if i have any other trouble and solutions  


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Mark Bisig

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I have been working on Chevrolets since 1979 and do all minor and major repair of these vehicles. I work at a large Chevrolet dealer. I can answer questions on engines, transmissions, drive-line, A/C, PCM, drivability. I will do my best to answer and get back to you fast.

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26 years working at a car dealer

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