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Yukon "Reduced Engine Power message"

74 messages,  Last post on Oct 12, 2009 at 9:54 PM

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What is this discussion about? GMC Yukon Denali, GMC Yukon XL, Car Safety, Electrical, Engine, SUV

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#51 of 74 reduced engine power/traction control lights by drew36 Aug 07, 2008 (12:40 pm)
I've had a 2005 Express 3500 for awhile now and about 1 year ago I popped a deer on the way to work. This took out the left front quarter along with all the electronics in that area, this was the first I saw of theses lights but a module mounted on that side was busted. Got the van fixed and no problem for 15-20,000 miles. The above mentioned lights came on and all the symptoms as stated from everyone are exactly the same . Shut the engine off and restart works for now. This has happened twice since the wreck on smooth roads with no rain or harsh conditions. One dealer charged to "reprogram" the computer and then told me they would start by replacing the in tank fuel filter, 500+ bucks.I think I will start by checking the engine grounds and the mounting of the fuse box which is oddly enough on the left side under the hood where the deer left his mark. It sounds like these people have a good lead on this problem and several solutions . If you have this same trouble please go to the first post and read all entries ,you'll most likely find your answer.
#53 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by chucka4 Aug 24, 2008 (11:27 am)
Replying to: bunchz71 (Aug 07, 2007 9:10 pm) 2001 Yukon V8 reduced engine power error   SPOT ON WITH THE HARNESS!!!!!!! My wife called today with the "reduced engine power" alarm. She restarted it and got it home. I found this website and this post. Took note and went to the connector. moved it around an got the same error. went and looked......YELLOW WIRE WAS BROKE!!!. Now, it looks to be about a 8 strand wire which was bent at the connection. I think that they should have used wire with more strand and made it longer to reduce the "KINK". I soldered a long piece in with more strands. Problem fixed.    THANK YOU GUYS!!!!!!!!!!!!!!!!!!!!!!
#54 of 74 2003 GMC SIERRA 2500HD by 096torrer Nov 09, 2008 (8:07 pm)
I have an issue with my truck, the check engine came on along with the reduced engine power warning light? Any ideas what to look for?
#55 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by 096torrer Nov 17, 2008 (4:54 pm)
Replying to: bunchz71 (Aug 07, 2007 9:10 pm) Does anyone have a photo of what a throttle actuator control (TAC) module is on a 2003 GMC SIERRA 2500HD
#56 of 74 2003 denali XL "Traction Active" by eddy17 Nov 20, 2008 (5:47 pm)
Help from a start "traction active" displays on dash and you can hear down by the gas pedle inside slipping grinding noise ? and no power not a good thing when your in an intersection ,if I let off the gas and hit it again it takes off , or I have pushed the button on the dash "stability system disabled " and leave it off . is this anything to do with the brown with white stripe plug in under the hood .thanls
#57 of 74 REDUCED ENGINE POWER by edlynaquino Nov 20, 2008 (8:19 pm)
I also encountered this REDUCED ENGINE POWER on my 03 YUKON XL. I pulled over. Turned the engine off.Waited a few minutes, then turned it on again and turned it off twice. On the third try, the idling went back to smooth and no more REDUCED ENGINE POWER message.This only started when my battery was dying. After replacing the battery with the engine running, the AC don't seem to blow cold air anymore. I dont even hear the AC compressor kick in. You might be wondering why I had the engine running while replacing the battery because I thought I would need a code to unlock my stereo lock.Please help
#58 of 74 2003 Yukon XL - Reduced Engine Power/slow to kick over by skewter Apr 02, 2009 (12:40 pm)
OK I have read most of the posts on this and I did a couple of things suggested like the grounding wire, and the wires on top-just jiggled em. It seem to work but I am still having some issues with it starting. The latest is; when turning the vehicle on, it kicks over slow, like it has a low battery, or low charge. The clock will not keep its time so whenever you turn the vehicle off and then start it again, it always goes to 12:00. Could this mean I need a new battery? and why would the reduced engine power lignt come on ever so often? just need some help - dealers are ripoffs and I do not have a mechanic I can trust or the $. thanks in advance Replies to this message: bunchz71 (Apr 02, 2009 7:17 pm) rsht (Apr 03, 2009 6:30 am) skewter (Apr 04, 2009 4:37 pm) yukon03 (Apr 14, 2009 5:56 am)
#59 of 74 Re: 2003 Yukon XL - Reduced Engine Power/slow to kick over [skewter] by bunchz71 Apr 02, 2009 (7:17 pm)
Replying to: skewter (Apr 02, 2009 12:40 pm) Maybe to me sounds like you have an alternator going out. If the battery is weak, and not fully charged, your ignition system may not get getting the full voltage that is recquired to function properly. Any warning lights on the dash on, other than Reduced Engine Power ?
#60 of 74 Re: 2003 Yukon XL - Reduced Engine Power/slow to kick over [skewter] by rsht Apr 03, 2009 (6:30 am)
Replying to: skewter (Apr 02, 2009 12:40 pm) From your description, it sounded to me that there May be a couple of areas you want to check; but before you do anything, I suggest you barrow a good battery charger to fully charge your battery first. Upon fully charged your battery, try to start the engine and then turn it off and back on to see if your clock still resets to 12:00? If it does, you may have a problem with wiring/connection to the ignition switch... As far as the battery charge, how old is the battery? Have you checked the battery fluid/acid level in each cell (be careful, not to smoke or have spark around when checking)? Its possible that you may have a bad alternator like bunchz71 said in the previous post. You can do a primitive check with a volt meter from the battery terminals with ignition off (~12.6VDC) and with the engine running (~14VDC); but the best is use a proper battery/alternator tester, perhaps your local AutoZone, Advanced Auto or similar can help and ID if its the battery or the alternator is due for a replacement. Replies to this message: skewter (Apr 04, 2009 4:37 pm) yukon03 (Apr 14, 2009 5:56 am)

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