Last post on Dec 10, 2013 at 10:02 PM
You are in the GMC Yukon
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GMC Yukon Denali, GMC Yukon XL, Car Safety, Electrical, Engine, SUV
#485 of 592 Reduced engine speed, stabilitrk system ect,
Sep 22, 2012 (8:21 pm)
Repost - my message was taken off for putting a phone # of the automotive shop, sorry to anybody offended
Sorry if this isn't the right place. To all who have trouble with reduced engine speed, my 2004 Yukon sat for 14 months, the computer kept saying this was wrong, I fixed everything as it said was wrong, it was all bull crap, everything I fixed kept sending my truck into reduced engine, I almost caused a few scary accidents when I pulled out into traffic. Finally the truck security locked up my truck, wouldn't start, gauges flashing, I put a new throttle body, computer, pedal sensor, the other computer that controls door locks ect, mass air flo, everything electrical, it still went into reduced engine, there was only one thing left to do, I was so pissed off after 14 months, I left the truck running, I grabbed the wire harness to the throttle body ect. The truck died. There were 2 wires melted and the ground wire thinned out, what happened was there was a short in the system and it took out the computer, I didn't have to put all these other parts on but I left them on so I don't have to go through this again. During these 14 months after applying new parts it could run for 5 min to a couple of days before it went into reduced engine speed, it cost me over $4000 to do all this, check your wire harness first so u to don't go through this, and stay away from gmc certified mechanics, I took my vehicle to them and they played guessing games, I took this Yukon to 4 shops, gm mechanics this would of costed me about $8000. Mike Goodes automotive of Ottawa, illinois gave me good prices and will to anybody else, my truck was the first for him to figure out, so basically I was the lab rat, now this should be a cheap easier fix for other people. My Yukon started out to where It would go into reduced engine speed, I could pull over, restart my vehicle and drive normal. As time went on it got worse till finally it wouldn't start due to the security crap, I did everything I could possibly due right, it was tiring and frustrating. Now I been driving out of town far away with no problems, to many people including gm thought they knew what my problem was, gm charged me $900 for nothing
#486 of 592 Re: Stabilitrak On, Traction Control and Check Engine Lights All Flashing [svertheen]
Sep 22, 2012 (9:31 pm)
Worst case scenario depends who u works on it, I did some work myself and had it at a lot of shops, the gm dealer tried to charge me $900 just to look at it to tell me it was the throttle body which was just put on by me, I refused to pay and didn't, I took it to other shops and paid them a $100 each for advice and diagnostic, they all had different opinions, guessing games, it cost me $4000 ish to replace all electrical n fuel things except fuel pump. I went to Goodes automotive in Ottawa illinois because he was cheaper by the hour and someone I trust, this has been a experience for him, keep in mind I'm very experienced in working on cars, diesel equipment and small engines, everybody I took this vehicle to was confused, I had to stop working on my Yukon due to a major back surgery, I had to fix it because I couldnt get any money for a broke down yukon or dare sell my headache to someone else. I wanted it fixed so I didn't have to buy another vehicle and go through another nightmare. I also still had a loan on it. My truck still looks brand new so it was worth the $4000 I put into it. If you go to a gm dealer you would of spent $8000 for what I had done, I can't describe in words how difficult this was, I thought I was going to eat $30,000 Yukon and give up till I discovered the wire harness was also a big issue contributing to reduced engine speed. The wire harness gmc makes are garbage. Another thing to watch out for is where u go for parts, I like car quest, napa, advanced, some things from auto zone, oreilleys, ect. If u do go to gm you will pay 2-4 times more for a part than the places I mentioned, my mechanic was $70 an hour to where gm is at least twice that price or close to $180 an hour, I can't afford guessing games for this problem and parts from gm. I buy a manual on all my vehicles to completely tear down and rebuild. I needed help due to medical problems, it was nice to find the automotive shop I went to, there were times I needed parts for my Audi A6 Quattro. I needed new ball joints but you have to by the a arms complete, I found them for $400 and he found it and put it on for $$212.00, check your wire harness FIRST, then go to a autozone if that doesn't work and they will diagnostic the check engine for free, keep in mind 1 bad part can show multiple problems so it can be confusing where to start. I would of rather put in a clutch, transmission, engine ect instead of all I did for reduced engine speed, don't be fooled by shops for this particular problem, I would be happy to help any body with this problem if u like to face book me, Shawn vertheen, all my info to reach me is there, I don't want to give my email address or phone number do to them removing my last post, I understand why they did.
#487 of 592 Re: Stabilitrak On, Traction Control and Check Engine Lights All Flashing [cinderrella]
Sep 24, 2012 (6:09 am)
Good morning cinderrella,
Sorry to hear that your trip was interrupted in this way. Were you planning on visiting your GM dealership for a diagnosis? There will likely be a diagnostic fee involved (which varies from dealership to dealership). Let us know if we can look into this further with you by emailing us at socialmediagm.com (include your name, contact information, and the last 8 digits of your VIN).
Sarah, GM Customer Service
#488 of 592 Re: Reduced Engine Power mode [rongavaldon]
Sep 24, 2012 (7:38 am)
I filed a complaint with the National Safety Transportation Board.
My truck is a 2007 Yukon XL, bought it new. Nothing but problems.
#489 of 592 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 592 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 592 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 592 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 592 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