Last post on Dec 07, 2013 at 7:23 PM
You are in the GMC Yukon
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GMC Yukon Denali, GMC Yukon XL, Car Safety, Electrical, Engine, SUV
#489 of 588 2003 - 2010 gmc Yukon reduced engine speed
Sep 25, 2012 (12:50 am)
This is the beginning of my story, I was 45 min from home when my door looks flickered on n off, gauges flashed acting weird, I had to pull over due to no power, the pedal could be all the way down and no power, reduced engine speed. I turned the truck off then on, made it home no problem, for the next 4 months it just kept repeating, turn truck off then on and good to go, the problem got worse, it got to the point I couldn't drive it a block, I went through everything and I could not figure this problem out, I was the type of guy to drop a transmission and put a clutch laying on gravel, took it to shop 1, they said o it's the throttle body, so I fixed it, still went into reduced engine, then they said it was the PCM, I had that fixed, same thing, shop 1 couldn't figure it out, I was trying to avoid a gm dealer cuz they are 2-5 times a part and 2-4 times in labor, they diagnosed the truck to tell me it was a throttle body and pedal sensor, they tried to charge me $900 to tell me something that wasnt true. They are the reason i started working on cars 17 years ago. I have restored cars from the ground up, I was angry, gm Chevy mechanics in my experience think they know it all, I put a new pedal sensor assembly on, still went into reduced engine, I took it to shop 3, that guy didn't waste my time with his opinion, he said sorry I can't figure this out, my computer was saying this was wrong when it wasn't, I know cuz I just fixed those issues. He told me I should trade it in but I woulda lost a lot of money, or do I want my problem to be someone else's problem. Finally after 9 months I took it in to a friends shop, took all the new parts in and got new ones. Still didn't work, my truck locked up, the truck wouldn't even start, after weeks of playing around I had another computer put on, started right up. It still went into reduced engine speed, I lost a lot of sleep over this.............. I had a gm tell me it's easier to sue them than do a factory recall, they admitted that there is a problem. I came to this website a year ago, I fixed everything that could cause this except the wire harness, that was my last step, sure enough when the truck was running if u grabbed the harness the truck died, the wire harness had 2 melted wires and the ground was thinning out, that finally fixed my truck, I fixed so many parts even stuff I didn't mention, I spent $4500 but that included new tensioners, belts, trans filter changed, differentials changed, battery, synthetic oil changed, new rear wiper motor, new computer, new PCM, pedal sensor, mass air flo sensor, air conditioning pump, brake pads, rotors, calipers, 1 wheel hub assembly, a new ignition, fuel parts, fuel filter, 2 bolts drilled n tapped on exhaust, ect ect, if u went to a gm dealer that would cost u well over $8000, Goodes automotive in Ottawa Illinois did all that 4 me while I had my back surgeries, it was worth it, if I bought a new vehicle I would go through all this eventually, now I'm back to driving my 2004 Yukon out of town. The truck looks brand new, I was afraid to drive before this got fixed, I didn't want to be stranded with my kids far away, the way I see it is this should be cheaper for other people since this was a first experience for them and me as we'll. I think if I caught the short in the wire harness first I wouldn't have had to replace all this extra stuff. I have never experienced anything like this in my life, I used to do complicated things on cars before, I used to work on diesel equipment, restore cars, install audio systems, the boss at work for land development, use the GPS, grades, blue prints, I just received a large amount of $s I will by a ford now or anything but a Chevy gm.
#490 of 588 2002 to 2010 GMC Yukon or Chevy reduced engine
Sep 25, 2012 (1:05 am)
I beg anybody to please check your wire harness when reduced engine happens, even if u have to grab the throttle body harness and shake it with the truck running, if the truck dies or idles weird then that's your problem. I just don't want to see this happen again to people, very very dangerous to drive with reduced engine. There is to many shady shops out there today and gm dealers, my friends that were gm techs, some didn't graduate or just finished there diploma, if gm likes you they put u through school.
#491 of 588 Re: 2002 to 2010 GMC Yukon or Chevy reduced engine [svertheen]
Sep 25, 2012 (4:49 am)
Exactly where is the wiring harness?
#492 of 588 Re: Reduced Engine Power mode [gmcustsvcsarah]
Sep 27, 2012 (10:02 am)
I tried your so-called email and it failed. I dont think you are for real. My email is Rongavaldonaol.com I will corrispiond that way. By the way I am still haveing the same Reduced engine power mode problem. and have since taken our vehicle in to the dealership ervery other week since May. still no fix.
#493 of 588 Re: 2002 to 2010 GMC Yukon or Chevy reduced engine [svertheen]
Sep 27, 2012 (10:08 am)
Ive tried that, and still no sucess. I dont like the way the harness just hangs there too much vibration could render the harness trash. Still having REP problems.
Oct 02, 2012 (1:42 pm)
Started having this problem on my 07 Suburban today. Shut it off and it runs ok now, but check engine light is still on
#495 of 588 Re: Same problem [jamendolare]
Oct 03, 2012 (8:20 am)
Good afternoon jamendolare,
Are you planning on working with your dealership to get this looked into? If you are, and if you wanted for us to check into this further, please contact us via email at socialmediagm.com (include your name and Edmunds username, phone and address, the last 8 digits of your VIN and mileage, and the name of your dealership).
Sarah, GM Customer Service
#496 of 588 Re: Same problem [gmcustsvcsarah]
Oct 07, 2012 (6:10 pm)
This is a joke. GM does a recall because of 4 accidents on 4 vehicles....I was in an accident due to reduced engine power and on this message board ALONE you see the dangerous hazard this has caused. My vehicle has been parked for ONE YEARbecause no one will help and I am still paying for the junk.and it does not run AT ALL. I would love some support from GM.
#497 of 588 Re: Same problem [donewithgms]
Oct 07, 2012 (6:40 pm)
Have a gmc denali 2005 have taken it back to dealer 2 times first time lost of power came on my wife and kids were in the car on freeway when the car lost power and they were trying to change lanes had it told to dealer they said loose connector repaired the car in about 3 hrs about a month later driving pass school when it say lost of power and turns off the hold time no power steering or power brakes trying to avoid kids the dealer came out towed the car in cause it was the same problem they said would be ready in a couple of days they called me in about 4 hrs and said it was ready so the next morning me and my wife picked it up and ask what was the problem they gave me same answer asthe last one.Not to be confuse i bought this car used from honda dealer the first incident car was still under 90 day warranty i told them each time how this doesn't seem safe for me but more so my kids and wife and they insured me it was safe now but to weeks later the same thing happened to my wife on the freeway highway patro had to help here get out of fast lane and to the side of the freeway safely.Sad to say but someone most likely traded the car in and honda sold me a lemon which is unsafe because if gmc can't fix it how can honda any ideals on how to deal with this.
#498 of 588 Re: Same problem [piznope]
Oct 09, 2012 (9:52 am)
Good afternoon piznope,
Is the dealership you've been working with one of our GM dealerships? If so, we can check into this further with you if you like. Please contact us at socialmediagm.com with more details (include your name and Edmunds username, phone and address, the last 8 of your VIN and mileage, and the name of your dealership).
Sarah, GM Customer Service