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GMC Yukon Reduced Engine Power message

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  • Just returned from a deployment where my car sat for about 4 months. When I finally got back into it, it drove fine for a bit and then I started getting "service suspension" message and the check engine light was on. I took it into Autozone to get some supplies and had them hook up the diagnostics. Error codes P449 and P045 came up relating to the gas cap and possible solenoids or vapor canister. Basically the gas cap wasn't tight or I was topping off the fuel and some went into the vapor canister... no big deal, just tighten the cap and disconnect the negative terminal on the batt for about 15 seconds and the computer will reset the check engine light. NOTHING addressed the suspension issue. So driving to work this morning and at a stop light my dash started chiming and "stabilitrak disabled", "traction control disabled", and "reduced engine power" came up. Took off from the light and it was rough. I pulled into a parking lot and looked up some stuff on the net. I was letting my car sit while off when I heard a "click" so I tried starting it and the warnings were gone but the check light was still there. But it ran fine so I continued on to work. About a mile down the road, it all happened again as I took off from another stop light. So I pulled over and called a tow truck. I was researching stuff and was going to have it towed to the house where I would replace the throttle body sensor, clean the throttle body, replace it, or whatever. Mind you, it started up no problem. Then the tow truck got there and it wouldn't wouldn't turn over at all! He started telling me it was the starter! So I changed my mind and had it delivered to the GMC dealer service center where I await a diagnosis...
    I've read everything from it's a dirty throttle body to the computer needs to be reprogrammed. Anyone else experience this series of issues? I feel like I'm looking down a rabbit hole and I'd rather not fall in regarding the issues you all below have run into. - Vince
  • I have a 2009 Yukon with the same Engine Power Reduced and runs terrible. I have been an avid Yukon owner for the last 12 years. I'm now done. I am trading my current yukon in and will never purchase another GMC product knowing they do not stand behind there vehicles.
  • Glad to discover this forum. I thought I was alone with this problem. My wife is scared to death to ride with me anymore, fearing that the feared "Engine Power Reduced" message will flash up once again telling us what we already know!

    After having the both the throttle body and the ECM (both rebuilt) replaced by my local garage due to first a complete failure to idle and then a rough idle and this issue, I took it to my local GMC dealer. After having it for 3 days they still couldn't 'duplicate' the 'condition'. I volunteered to show them exactly what happens upon the first start-up of the morning. Sure enough, happened with the 'technician' in the truck less than a mile from the dealership. Could they fix it? Did they even indicate that they had done something as simple as perform the search I just completed on the web? Of course not! They printed out the trouble codes for me and washed their hands like it was Easter and I was you-know-who. But at least I have most of a vehicle to drive. My service display gives me these codes about, oh, ONCE A DAY!

    Please, someone from GMC, get in touch with Brogden in Olathe, KS and tell them what's going on here. If there is a fix, will you please let me buy it? Or are you keeping your dealerships in the dark on this issue? Is this some sort of poison-pill secret corporate-level-planned-obsolescence built in to these trucks to get us to trade up to a newer model? Well, it won't work in my case. I'm on a fixed income and this is my last SUV, ever. I'm sick of it and my wife's scared of a truck she used to love because it has such great seat heaters.
  • littlewoodylittlewoody Posts: 2
    edited December 2013
    Laura M. Please read my post of earlier this evening (587). If there's a fix for this, I need it before I try to pull my 32' trailer to AZ with my '03 Denali. Thanks.
  • Has someone found a solution to this because the GMC dealer keeps charging me money to "fix" the issue but it's still happening. If everybody is having the same issue, then clearly it's has to be an issue with the vehicle and a recall should be done! It's very dangerous and I have been afraid for my life many of times because of this issue. The GMC dealer replaced my throttle body, no such luck. Took it back and they replaced some ground wires, still no fix. Took it back a 3rd time and they said it was my TAC module, they replaced it, still NO FIX! Each time costing me hundreds of dollars! I refuse to keep taking it back paying money and it's not solving the issue! Isn't that illegal? I'm confused on how you make a vehicle, but you have ZERO idea on how to fix it when something goes wrong. And clearly it's not a one person issue, so it's something faulty in the makeup! I'm so irritated! Any suggestions? Has anyone that had this issue, fixed theirs completely?
  • The only solution I have found is to buy Ford. You're right, this should be taken care of, but it isn't and it's dangerous. GM's answer is to put some very nice social media reps on this forum in hopes of keeping people calm. We still have our Tahoe, but replaced my Silverado with an F150. The Tahoe will be the next to go to a Ford.

    Good luck djswifey.
  • I tried everything!!
    I didn't get any very nice social media reps contact me!
    I too, had to (guiltily, because I had to give someone else my problem) trade it for a Toyota.
    I couldn't take it any more!
  • zwupzwup Posts: 1
    I have the exact problem here. I thought when I could not start it at all that it was related to the security system. The security light stays on and cant lock or unlock doors unless the key is in and on.

    Usually resets between half an hour up to two hours.

    Tonight it went into reduced power mode. I made it home about 3 miles from town but live in a mountain area. I was down to 15 to 20 miles an hour and lucky to not get hit. Well maybe it would be better if I get pasted then I can junk this piece of crap and by a real vehicle. NOT GM!!!!

    I have been GM almost 100% but after seeing how they build cars now no more GM for me....

    I have had it at dealer and 4 outside repair shops... so far about $1500 in and it is as bad as ever.
  • I have a 2007 Chevy Avalanche with high mileage. This reduced engine power issue started to occur about 6 months ago. The issue would seem to take place in spurts. It wouldn't occur for a few weeks and then it would happen several times over a few day period. My wife wouldn't drive the vehicle so I became very adept at removing the battery cable waiting a few seconds and then reattaching. This would always correct the issue for a while but became very annoying as it would seem to happen at the most inconvenient times.

    The issue started when the vehicle had about 175,000 miles on it and at 197,000 miles I decided to order the direct replacement throttle body from Rockauto. I didn't decide to change the throttle body until I read all of the comments listed here. It seemed to be the most logical fix for the 2007 model year as compared to many who have had the wireharness type of causes. The throttle body cost me $167 including a new gasket (which you won't need) and shipping. The replacement is very easy and took me 30 minutes to do myself. I'm writing this now after almost a full month of no issues. Since my vehicle has high mileage, the replacement of the throttle body which was relatively dirty has improved the responsiveness of the vehicle. So far so good... If anything changes I'll post another note.

  • nukstrnukstr Posts: 4
    edited December 2013

    FINALLY FIXED, "SERVICE STABILITRAK & TRACTION CONTROL DIAGNOSTIC PROBLEM: "SERVICE STABILITRAK", "SERVICE TRACTION CONTROL", "HARD SHIFT 1-2 GEARS"-(STABILITRAK TURNING OFF-CLUNK NOISE) "STABILITRAK OFF",

    "TRACTION CONTROL OFF"

    CAUSE:

    FUEL WAS 45% ETHANOL @ 85-(COSTCO GAS)-COMPUTER WENT INTO LIMP MODE CAUSING (AFM) TO GET STUCK AND NOT RESET COMPUTER.

    SOLUTION: DRAINED & CLEANED GAS TANK- CHANGED FUEL FILTERS (*ONLY IF NEEDED) CLEANED INJECTORS- RESET COMPUTER- FILLED GAS TANK WITH NO ETHANOL- (http://pure-gas.org/index.jsp)

    TOTAL AMOUNT WITH TAX: $444.86

    REFERENCES (STABILITRAK CLUNK NOISE): http://chevroletforum.com/forum/silverado-fullsize-pick-ups-21/2010-silverado-stabilitrak-question-47580/ (AFM)-Definition: http://en.wikipedia.org/wiki/Active_Fuel_Management (ETHANOL): http://en.wikipedia.org/wiki/Common_ethanol_fuel_mixtures (GAS STATIONS WITHOUT ETHANOL): http://pure-gas.org/index.jsp

  • hockeyrefhockeyref Posts: 3

    2003 Denali XL, 195,000 miles. Problem same as everyone else here. without warning, check engine light, reduced power and stability system shut down. code 1516. can clear DTC code to resume, but this is a HUGE safety issue.. Cleaned throttle body, added additional ground strap, check TB wires...nothing has corrected problem. GM is at fault here and they know it...contact me if info needed for possible class action. I'll participate.

  • jessebell82jessebell82 Posts: 1
    edited January 9
    hello all ive have to battle with idling around for weeks in my 03 2500 silverado and reduced engine power and after reading from these pages in this site ive finally figured out my issue! it was the combination of both the pedal and the module it plugs into. now she runs great I just want to thank you all for posting up your solutions
  • lalaleezalalaleeza Posts: 10

    Ok, I have a 2004 Tahoe LT and have had it for several years. I love it. I have never had a problem with it until the last few weeks. While driving down the road it will give you the dreaded "reduced engine power" message. It is intermittent and will not do it all the time. I am experiencing the same issues as every other poster on here and it will idle down to a crawl and will not accelerate. Well, last night I went to the river to do a little gigging. I couldn't get up the boat ramp!!! Every time I went to accelerate, it would roll backwards toward the river!!! I have had it looked at a million times, and no one can tell me how to fix it and what to do. I am assuming GM is aware of this issues because this thread was started YEARS ago. Why has there not been a fix yet? I am concerned because I am a single mother of 3 young boys and CANNOT have this dangerous problem continue with my children in the car! I am scared to drive it and it now sits in my driveway which is a real problem because it is our only vehicle!! What do I need to do?! I don't think a known problem should be put on the consumer if GM knows and has known about this!! I need help!

  • lalaleezalalaleeza Posts: 10

    Ok, so I called the GM consumer complaint line and was given a "Case number". The woman told me on the phone that there was no active recall on this issue however "special coverage" was issued for the year make and model of my vehicle. She also said that because I was not the first owner of this vehicle that the special coverage did not apply to me because I was out of the perimeters of the coverage. All she could do was set me up an appointment at a GM dealer but I would have to pay the diagnostic fee. I have already done that several times and each time they tell me that my car is not "throwing a code" so they cannot tell me what is wrong. This is highway robbery. I am a single mom of three that invested in this vehicle because of Cheverolet's reputation of safety and longevity for the safety of my children. I got the error message again today to bring my children to school and crawled into the parking lot late and at about 4 mph. No one can seem to tell me what the problem is to fix it. If GM has known about this problem enough to issue "special coverage" then why are they so willing to just turn a blind eye. GM knows that they have a problem and will not fix it. I am beside myself. The lady on the phone told me to purchase a new vehicle if I can't get it fixed. Well, if I cannot afford a diagnostic fee every week I sure as hell cannot afford a new vehicle. This is ridiculous! The safety of myself, my children and others is at stake here. No one at GM will own up to the fact that they have an issue and won't fix it. Billions of dollars of yours, mine and every other tax payers money was used to bail out the auto industry yet they stand by and tell you there is nothing they can do to fix it. The CEO and CFO's of these auto makers are making millions of dollars per year yet I make just enough to scrape by for me and my children and yet they sit there and do nothing. I am sure that they even get their choice of BRAND NEW VEHICLES every year to drive around while I am stuck trying to drive around a car that is malfunctioning because that is in my budget. I took GM's word on their reliability of their vehicles, and safety and longevity of having a "Chevy" for "generations". THAT MY FRIENDS IS JUST FLAT OUT FALSE ADVERTISING..... If anyone knows how to fix this issue without costing me thousands please any info would be great. I just need my reliable car to be just that.... reliable!

  • hockeyrefhockeyref Posts: 3
    edited January 13

    Update: Replaced Throttle body this weekend. $165 with shipping from Amazon...so far so good, been error code free with HWY driving. checked all wire harnesses while truck was running, pulled, wiggled etc...no code. keeping fingers crossed.

  • FY Folks, a inexpensive scanner can clear the p1516 and any other DTC's to keep you running. This is not a fix but will allow you to resume normal operation once the code is cleared. well worth the investment and has saved me thousands in diagnostic reading fees and towing.

  • tesbartesbar Posts: 1

    We have a 2010 GMC Yukon and just yesterday experienced the REDUCED ENGINE POWER problem!!! So far it has been our first issue with the vehicle, and from what I am reading we have the potential to have many more issues. I cannot believe there is not a recall on this matter. I am lucky enough to have been close to home when it occurred as many were not. We are an active family with four young boys. We chose this vehicle for both the size and what we thought was safe.

  • jordan40jordan40 farmersville, nyPosts: 109

    i would do an engine over haul. but with young kids that might be the worst choice. i would get a chevy suburban any year i think its a bit bigger, some what safer and no problems that i know of. i own three. one is a 2010 one is a 2012 and the other is a 2013

  • jordan40jordan40 farmersville, nyPosts: 109

    @lalaleeza said: Ok, so I called the GM consumer complaint line and was given a "Case number". The woman told me on the phone that there was no active recall on this issue however "special coverage" was issued for the year make and model of my vehicle. She also said that because I was not the first owner of this vehicle that the special coverage did not apply to me because I was out of the perimeters of the coverage. All she could do was set me up an appointment at a GM dealer but I would have to pay the diagnostic fee. I have already done that several times and each time they tell me that my car is not "throwing a code" so they cannot tell me what is wrong. This is highway robbery. I am a single mom of three that invested in this vehicle because of Cheverolet's reputation of safety and longevity for the safety of my children. I got the error message again today to bring my children to school and crawled into the parking lot late and at about 4 mph. No one can seem to tell me what the problem is to fix it. If GM has known about this problem enough to issue "special coverage" then why are they so willing to just turn a blind eye. GM knows that they have a problem and will not fix it. I am beside myself. The lady on the phone told me to purchase a new vehicle if I can't get it fixed. Well, if I cannot afford a diagnostic fee every week I sure as hell cannot afford a new vehicle. This is ridiculous! The safety of myself, my children and others is at stake here. No one at GM will own up to the fact that they have an issue and won't fix it. Billions of dollars of yours, mine and every other tax payers money was used to bail out the auto industry yet they stand by and tell you there is nothing they can do to fix it. The CEO and CFO's of these auto makers are making millions of dollars per year yet I make just enough to scrape by for me and my children and yet they sit there and do nothing. I am sure that they even get their choice of BRAND NEW VEHICLES every year to drive around while I am stuck trying to drive around a car that is malfunctioning because that is in my budget. I took GM's word on their reliability of their vehicles, and safety and longevity of having a "Chevy" for "generations". THAT MY FRIENDS IS JUST FLAT OUT FALSE ADVERTISING..... If anyone knows how to fix this issue without costing me thousands please any info would be great. I just need my reliable car to be just that.... reliable!

    if you want take it to your neiborhood repair shop not the big dealership. you woll get to know the mechanics and might get discounts.

  • I have a 2004 Yukon Denali and am having similar problems with the reduced engine power issue. Mine do differ in that it doesn't happen while driving or at least not so far. Last night we drove about 120 miles to my daughters game and it ran fine all the way there. After about 3 hours we went to start it and come home and it immediately went in to the REP mode and the stability issue also. I disconnected the battery for 10 minutes and then started it up and the same thing happened. I ended up leaving it sit and we caught a ride home with friends. The issue has happened before but always disconnecting the battery has got it going again. While thinking about it on the trip home I realized that I had used the cruise control last night and the previous time that it happened. I never use it but for some reason I was talking and with out thinking set it and did not even think of the problem. Also when it goes into this REP crap the dash says I driver One, for the last couple months it has said driver Two and I had no problems. I only have one set of keys so I know it should stay on one of the setting and not change between them. Last summer on a trip the ac decided to blow hot on the drivers side but worked every were else and the heated seats would come on the driver side, I could turn them off but they came back on at random times. That for some reason stopped happening. I have done all the experiments that I can find on the web and have replaced both hubs and sensors, replaced ground wires....does any one else have an idea? I am driving back this am to hopefully get my Yukon back. It stinks going an extra 300 miles on a Saturday and not being able to say I can fix it in the end.

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