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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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#44 of 74 Traction Control Reduced Power/Stablity brake syst by problems2 Jan 21, 2008 (1:49 am)
Well i have finally solved my problem we replaced the throttle body and the wiring harness and took all grounds loose sanded them the tightened them back. I got this from a message a fellow left on this site and it worked for me not had this problem for two weeks and i was having it daily.   Thanks to all
#45 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by momtofour Mar 29, 2008 (12:50 pm)
Replying to: bunchz71 (Aug 07, 2007 9:10 pm) I cannot thank you enough for taking the time to post all of this information; I especially appreciate the photobucket picture, so I could locate what everyone was talking about. I went outside immediately, gently wiggled the wiring harness, restarted my 2003 Chevy Suburban... the REDUCED ENGINE POWER message was GONE... okay the engine light icon is still on, but I can drive my car now to the parts store... and thank you also for providing the part info and numbers and pictures... this has saved me a bunch of additional time...   I thought we were going to be involved in a horrible accident today on the highway... YES, this happened on the highway and we had an 18-wheeler baring down on us with no where to pull off... I did have the forethought to put on my hazards, and most people were able to change lanes and pass us... but the 18-wheeler could not move over, and for some reason was refusing to slow down at a more reasonable speed... he was inches from my bumper before he finally changed lanes... I had 3 of my 4 children with me, all under the age of 5 in carseats... I was so scared...   I cannot believe GM has not recalled or addressed this problem proactively... They will be hearing from me via certified letter...   So thank you EVERYONE, but most especially, you... you covered all the bases for us... and lastly, I'm sure you saved us a bundle of money, something we cannot afford to be frivolous with these days...   Laura (mom2four)
#46 of 74 engine light by moe1954 Apr 23, 2008 (3:53 pm)
I have a 2004 Yukon. My engine light has come on about 4 times sense I bought the thing. I keep taking it back to the dealer and they run dynostic on it and say that the fuel cap is not put on right. The last time I went there they put a new cap on it but the new cap goes on to easy and it dosn't seal good. It dosn't have the same seal in it the last cap I had, and now the light is back on. I guess I will put it in the repair shop if you cannot help me with this. I don't know if I should keep buying fuel caps or is there some wiring somewhere I can check. I don't know where to locate this. Thank you. Replies to this message: rsht (Apr 24, 2008 5:57 am)
#47 of 74 Re: engine light [moe1954] by rsht Apr 24, 2008 (5:57 am)
Replying to: moe1954 (Apr 23, 2008 3:53 pm) Not sure if you still have the old fuel cap? Some times the pressure relief valve inside the cap may be partially stuck, use a paper clip to gently push (through the little pin hole in the center of the cap) on valve to make sure it moves smoothly; as far as the cap seal (if you still have the old one), I would clean the seal and its contact surface on the filler opening. If all failed, personally, I would then hook-up an ODB-II scanner (your local AutoZone store can do it for free if you don't have a scanner) to see what is/are the trouble code(s) that associated with the Check Engine light... If the problem is with the fuel cap, the Check Engine light should go off fairly soon after the cap is on tight (~5-clicks...).   Just for reference, one time I left the cap off, my Check Engine light came on before I was even out of the gas station parking lot. After I put the cap back on, less than a mile, the Check Engine light went off by itself...
#48 of 74 hi by flex4 May 15, 2008 (1:52 am)
i have yukon XL 2001 model some time when i drive a car showing message REDUCED ENGINE POWER so you can help me on this Replies to this message: rsht (May 15, 2008 3:41 am)
#49 of 74 Re: hi [flex4] by rsht May 15, 2008 (3:41 am)
Replying to: flex4 (May 15, 2008 1:52 am) Have you had the chance to read Message #22 from "bunchz71" on this topic of discussion? He/she posted a link to a picture on where the bad connection was that caused the "Reduced Engine Power" message. Your Yukon is a couple of years older, so the position of the wires/connector may be in a different location.. Hope you locate the trouble maker easily with the information from this forum.
#50 of 74 Pontiac G6 ENG Reduced power by ea4president May 17, 2008 (9:05 am)
This morning I went shopping, came home everything was fiine, I tried to go back out a couple hours later, and I got a "ENG REDUCED POWER" message. I tried to turn it off and restart the car maybe that would fix it... nope. The car still ran so I tried to go around the corner, the first time i stopped at a stop sign I had to restart the car. Then the message didn't appear anymore. I continued to a gas station, got the same message when i got back in the car, and called for service. If anyone has any clue how this happens or how to fix it please let me know.
#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!!!!!!!!!!!!!!!!!!!!!!

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