Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

GMC Yukon Reduced Engine Power message



  • gmcustsvcgmcustsvc Posts: 4,251
    Looking forward to any updates, alsindiana. If you would like any assistance, be sure to contact us at (include your name and contact information, the last 8 digits of your VIN and mileage, and a summary of the situation so far).

    Sarah, GM Customer Service
  • gmcustsvcgmcustsvc Posts: 4,251
    Looking forward to any news, died01! If you want for us to check into anything, please email us at (include your name and contact information, the last 8 digits of your VIN and mileage, and a summary of the situation).
    Sarah, GM Customer Service
  • My 2007 is having these same problems. It says reduced engine power and only accelerates to 20 mph. Today it completely shut off/ stalled. Dies anyone know the cause and if it's been recalled?
  • gmcustsvcgmcustsvc Posts: 4,251
    If we can check for any open recalls on your vehicle, or help you work through getting this checked out by a dealership, please email us at with more information (include your name and contact information, the last 8 digits of your VIN and mileage, and a summary of the situation).
    Sarah, GM Customer Service
  • rfl2rfl2 Posts: 1
    I have a 2010 Yukon Denali and it just happened to me for the first time this morning. Dealer already fixed it for free under a special warranty code issued by GM for this specific issue. They seemed to know exactly what it is.
  • 2007 Yukon Denali XL 109k. Started doing the same last March. Usually all the dials go crazy, Stablitrak shuts off, check engine light comes on. Sometimes reduced power mode, sometimes not. Usually this occurs in drive thrus, oddly enough, but it's happened on the highway at 70mph a few times, too. I'd say it occurs once a month or so, usually in waves. Neither the GM dealers in Aransas Pass, TX or Boerne, TX could tell me anything about the issue or resolution, and my home dealer in Boerne, which is usually fantastic, just keeps telling me they'll need a few hours minimum just to start diagnosing the possible issue. Frustrating. Happened again two nights ago and Internet searching brought me here.
  • doysterbar1doysterbar1 Posts: 4
    edited February 2013
    I own a 2010 Yukon xl with 42,000 miles and the same thing happened to me on interstate tonight . All the same codes and reduced power as everbody else. I had to drive 40 miles on side of road hoping my children wouldn't be killed. WTF GM, Issue a recall before somebody dies!! Over 550 posts with same issue just on this site, think you have a problem maybe ?
  • gmcustsvcgmcustsvc Posts: 4,251
    We're sorry to hear that you had this experience out on the interstate over the weekend, doysterbar1. Let us know if we can check into this further by sending us an email at with more details (including your name and contact information, the last 8 digits of your VIN and mileage, and a summary of the situation).

    Sarah, GM Customer Service
  • There is special coverage for vehicles under 120,000 miles called "Throttle Position Sensor Replacement" that covered my Incident. I am hopeful this fixes the problem.
  • How'd you find that out? My dealer never mentioned that to me and guess what I just went over that mileage a month ago and had this problem way before 120,000 miles!!!!
    Anyone notice that the burnt out running light might be linked everytime mine burns out I have issues somewhere else.
  • I was contacted by Brandon from Gm as a result of this site. There is also a bulletin that came out on Nov 8, 2012 concerning a variety of vehicles from 2008 to 2011 adressing this problem and how to fix it. it is bulletin #11-06-04-007c diagnosis and repair the Engine control module. good luck
  • There is a throttle control module on the drivers side mounted on the firewall close to the brake booster if you unplug the big plug from it and the plug from the throttle body you can use an ohm meter to make sure the wiring is good from one end to the sure to set the ohm meter to check for a short so it will beep if the wire is good from end to end if no beep check that wire to see if it is broken at the throttle body plug end.I find that the wire is usually broken where it goes into the plug. the dealer can get you a new connector harness but it is close to $200.00 i would check with the local salavge yards you should be able to get one around $30.00 then all you need to do is splice the wires matching the colors and put heat shrink over the connections.
  • I've been watching the reduced engine power problem, and it happened to my 2009 Yukon this week, with the family in the truck, 400 miles from home.
    It has happened 6 times since, and I wish GM would just recall this and fix it. I am not a mechanic.
  • Did they ever replace your Throttle position sensor cover ? There is a bulletin on it . You are covered for 120,ooo for 2008 -2011. I listed the bulletin number on above posts. good luck
  • gmcustsvcgmcustsvc Posts: 4,251

    We're sorry to hear about that you and your family encountered these troubles so far from home. Let us know if there is anything you would like for us to look into for you. We can be emailed at (include your name and contact information, the last 8 digits of the VIN and mileage, and a summary of the situation).

    Sarah, GM Customer Service
  • devoz71devoz71 Posts: 1
    Hey, I am a gm technician 14years know, It upsets me to read all of these story's, I myself have seen several gm recalls over the years and I can not figure out why gm has not made this a recall (yes there are several bulletins and special policy's from gm concerning this issue) but both gm and most dealers know exactly what the problem is (99%of the time) and yes it is dangerous , the problem is on gm trucks/SUV (2007-2011) there are two throttle position sensors housed inside the cover on the side of the throttle body (they must "agree" with each other) and if they don't --reduced engine power is the default (usually p2135 dtc), the issue is the clearance between the plastic cover and the sensors is to tight causing one sensor to contact it and get stuck, this is why 80% of the time this concern happens in cold weather conditions, the new designed tps/throttle body cover and an ECM reprogram will and does fix this issue, I have never had one return after this repair, and I see 5-10 of these a WEEK!! In the winter (Canada)----c'mon gm make this a recall!!!!
  • Hello peps, I have that stupid "reduced engine power" display on my 2003 gmc sierra 1500 hd. I have tried these things; Checked wires at the TB, tested ok; Tested wires at the pedal, tested ok; cleaned and sanded a ground location" only one I could find; Disconnected battery; Connected a wire from neg of battery post to the TB and no change. The wires i did a tug test and actually looked at every one conected to the TB. I am at a loss and do not know what to do. Any other suggestions. There are 2 things i haven't tried yet, The fan wiring as well as the ABS sensor ground or something like that, lol. I am not a mechanic by any means but i do know enough to get me by and to save myself some $. please help
  • Hey i have a 2003 gmc sierra 1500 hd with about 230000 kms on it. The other day the reduced engine power displayed while i was driving on the hwy. It dropped in power and i could only get up to 40 km/h. I got home and shut the truck off and turned it back on right away. It went away for a briefe second and I was able to rev the truck up. It came back on and has been on ever since. I cleaned the TB and checked for broken wires at the TB and the pedal. I didnt see anything, but thats not saying that its not there. My truck runs like [non-permissible content removed] all the time know. When you are checking to see if your mass air flow sensor or you cylinders are working you take off the wires. If the truck doesnt change how it is running then you know that that particular cylinder is the problem. The truck runs like [non-permissible content removed] and I take the wiring off of the TB and it runs the same. Do you think that that is my problem.
  • The only way i found the broken wire on my buddies 2004 z71 was by using my ohm meter.i set the meter to check for a short it will beep if there is no break in the unplug the throttle body plug and the big plug at the throttle body control module mounted on the firewall above the brake booster on drivers side.i found the green wire was broken inside the plug at the throttel body.i have also seen the yellow wire broken in or around the wiring plug at th T.B..I f the wires all check good then i would try replacing the TB.It could also be the pedal position sensor.
  • kbrock1kbrock1 Posts: 1
    I have a 2010 GMC Yukon. It has 42,000 miles on it. We got it with just a couple hundred miles. I was sitting in park today when the check engine, stabilitrak and reduced engine power light came on. The engine made a horrible noise and the whole car shook. I immediately turned the engine off and sat there a few minutes stunned. When I started the car up after a few minutes, only the check engine light remained on. I have made an appointment to have it looked at. I thought, I will google this and see if there have been similar issues and WAS I SURPRISED at the amount of people posting the same thing! I can't believe there is no recall for this!!!
  • I of course am having this same issue with my 2010 GMC Yukon XL, I took it into the dealer, and my vehicle is out of the 3 year 36,000 mile warranty, I only have the Power Train Warranty left, I have 47,000 miles on the vehicle. Thi reduced engine power, check engine, stabilitrak issue happened twice within the past 5 days and after it happened the second time we took into the dealer to get it checked out. When I got the call today from GMC Service department I was not surprised to hear them say that it was indeed the Throttle Body. I was quite surprised to hear that GM has extended coverage on the throtle body and it will be replaced under warranty. So this was a nice surprise, Thank you GM for realizing this is a problem and offering extended warranty on the part/labor. It has yet to be determined whether this has solved the problem, hopefully it has and all is well.
  • gmcustsvcgmcustsvc Posts: 4,251
    Great to hear that your repair is going to be covered under warranty. Feel free to reach out to us with any future questions or concerns you may have.

    Amber N.
    GM Customer Care
  • UPDATE - I just got the vehicle back from the dealer service department and it turns out that the Throttle Positioning Sensor was replaced not the "Throtle Body", however it was covered under warranty and it seems to be working fine now, I just hope this was the problem and is fixed for good.
  • bigprofittbigprofitt Posts: 2
    GM Customer Care

    I have a 2004 Chevrolet Tahoe. For about a year now I have been trying to get my Reduced Engine Power issue resolved. I have had my Tahoe looked at by two GM dealers....Dale Earnhardt in Newton, NC and Randy Marion in Mooresville, NC. Dale Earnhardt said I needed to replace the entire wiring harness for around $900. Randy Marion said they could not find anything wrong with my Tahoe. So far I have replaced the throttle body replaced four time, the wiring harness going to the throttle body, the accelerator pedal, and the control module on the fire wall. I have had the wiring harness checked by two vehicle electrical specialists. I have spent around $4000 on this issue with no resolution. I do not want to get rid of this vehicle as I inherited it from my mother when she passed away two years ago. I am a disabled Marine Corps veteran and do not have an unlimited budget to spend on such issues. Any help would be greatly appreciated. Please Please Please help me. My wife drives this vehicle with my 6 year old daughter. This issue is a huge safety risk. I pray that GM will do the right thing here. Thanks for your time.
  • Ditto to the gentleman in message #558. I have a 2005 Denali and have replaced 3 throttle bodies, 2 wiring harnesses, 2 accelerator pedals and 7 days ago got stranded on vacation in Myrtle Beach, SC and had to rent a car for 4 days. The GM dealer called 'Detroit' and they said the wiring harness needed replacing. $800 for car repairs and $249 for car rental we went 70 miles before the reduced engine light came on again and the car slowed. We've been to 5 different GM Dealers, over $5,000 in repairs with not results. We have 4 GMC vehicles now, have owned 5 GMC's in the past. Can't believe a company as large as GM can build something that's unrepairable. No wonder the government had to bail them out. If anyone can help us, it would be greatly appreciated. Need to get in running in order to sell it.
  • pperdikispperdikis Posts: 1
    Maybe you can help me out. I have a 2003 Yukon Denali 6.0 liter engine. I have 300k miles on it. Recently the reduced engine power has been coming on. It gets worse when the ac is running. I have read all the blogs. Some fixes are dry gas and premium gas. Others is to replace the map sensor. I have taken off the engine cover thinking that it is touching, but no luck. One thing I have noticed is when it is about to happen the temperature gauge pings all the way to the right and the reduced power happens. Any help with this would be great. This is driving me crazy.
  • My 2008 Savana 1500 5.3 AWD van with 65000 miles . The reduced engine power stadila track low engine oil and po107 po641. When clearing codes the engine stops and only way to restart is to disconnect battery and reconnect and it might start. I have replaced the electronic throttlebody and the plug at the tb, replaced the map also.
  • campcrewcampcrew Posts: 1
    We are also getting the check engine and reduced engine power. We had it in to a dealer multiple times and they could not correct it. I replaced some of the wiring to no avail. What we found worked is replacing the gas cap. We can go for a year or so now before it comes on again. We have a spare gas cap with us and just hop out and replace it and off we go. I would be interested in hearing if this works for others that have this issue.
  • ive had this issue now for 4 months and ive been to the dealership 2 times now and they know nothing nor can they find anything. every downhill turn or bump on a turn my traction/stabiltrak light comes on and it stalls out on me for a few seconds but regains power after it becomes stable again. ive heard tbs,steering wheel sensor, wheel speed senor to where its costing a ton of money guessing. you would think with this many issues everyone is having that GM would look farther into this and train the shops to fix the problems and take care of the expense since we pay the high price to own a GM product. i dont even have 20,000 miles on my truck and its a pain to drive with this issue.
  • I have a 2000 Yukon has ran great until yesterday I have noticed for a couple months my Track light would stay on as if I turned track control off and I wasn't able to turn it back on. We'll it would only do that once in a wile but truck was still running fine Yesterday on the Way to get my daughter from school The reduced power light came on and I could not move . I did like everyone else and shut truck off and back on and the reduced power like was gone but now I had the service engine light on I went back home did a goggle search for the problem and found these forms . I tried tighting the battery cable to the engine block started it back up the service engine light went away I ran the codes and it came up with P1286. p1125 and p1285 I cleared the codes in hoping I fixed it but on the way to take my daughter to school today it did it again.. Has ANYONE fixed the problem for good yet if so Please let me know . and any help would be greatly appreciated.. Thank you David
Sign In or Register to comment.