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GMC Yukon Reduced Engine Power message

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    donewithgmsdonewithgms Member Posts: 24
    Please let me know what the dealership says about it breaking 2 days after it was "fixed". My 2007 Yukon XL, got a new throttle body on a Monday and was back at the dealership on a Wednesday. Same Reduced engine power and stabilitrak off lights came on.

    The dearlership assured me that the problem was completely unrelated to the fix on Monday, but I don't trust the dealerships. It was of course an additional $500 to fix.
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    dan01371dan01371 Member Posts: 1
    I just had the same problem on my 2004 1/2 ton Chevy Suburban. I checked the wire harness going into the throttle body, and one of the wires was broken inside the casing. GM really should be recalling this due to the wires being of such low quality that they are breaking so easily. Anyway I rewired the broken one and the truck runs perfectly now. Just had the problem 2 days ago and had it fixed in less than an hour yesterday. Super easy fix.
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    teamradoteamrado Member Posts: 16
    Took my 03 in on Aug. 16th and was told might be a battery issue ( weak not holding charge) so they changed battery and checked wiring per GM bulletin. Cleared codes and returned truck on Aug. 19th. Had " Reduced engine power " on the 22, 24,26, and 27th of Aug. Cost me $342.00 first visit and still have REP. Truck back to dealer on 29th and they called to say they found corrosion of wiring harness to throttle body and problem fixed. Same one they checked the first time as per GM but I guess they missed it!Picking truck up today so time will tell.
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    pssdatgmcpssdatgmc Member Posts: 17
    after tighting the battery and dry gas with premium. Still has not done it again.. knock on wood..
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    pssdatgmcpssdatgmc Member Posts: 17
    alls I did wah put in dry gas and start burning premium gas.... Don't count on GMC
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    teamradoteamrado Member Posts: 16
    Your point about GM is well taken. Picked truck up yesterday at 11:30 am from dealer and had Reduced engine power again this morning on my way to work. Told me they replaced the wiring harness to TAC module. From this point on they can change what ever they want but if it dosen't fix the problem they will get no money from me. See me in court. They have GM rep's who visit this forum but offer what in help. Just about done with their product's.
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    gmcustsvcgmcustsvc Member Posts: 4,252
    ntilghman,

    I apologize for the problems you are experiencing with your vehicle. By chance have you contacted GM Customer Assistance? If so, could you please email me your case number? I would like to look further into your situation.

    Thank you,
    Caron, GM Customer Service
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    annickannick Member Posts: 1
    What a nightmare!! Purchased brand new GMC truck for my business. I transport very expensive show horses (up to 1 million dollars!) all over the country. I only have maximum 4 to 5 horses and my trailer is not that heavy. I drive approximately 70,000 to 80,000 miles per year. Started having problem around 75,000 miles. The truck believes that the fuel filter needs to be change and goes to reduced engine power mode. When this happen, I have to pull over as quickly as possible and stop the truck. I usually wait until it get smart again... can keep driving until the next time (at the beginning from 1/3 of a mile to hundreds of miles!) First I though that it was only in hot weather and pulling the horses but discovered a month ago that it does it in cool weather and without pulling anything. Very dangerous for me and my client's horses, when in the middle of Los Angeles, in traffic, you truck travels 20 miles per hour and you need to find a place to stop on the highway. If anything would happen to those horses I could get sued. Many expenses at dealership to try to fix the problem. Every time after "fixing the problem" I went back on the road to find out that the hard way that it is still there...My husband had to miss work to bring me another truck in order to finish my trip so many times, sometimes hundred of miles from home. Spent within 6 months close to $20,000 to try to make it run right. The engine blew up when I had 150,000 miles. Replaced it and now has 50,000 miles on the new engine, injector, injector pump and it is doing it again. GMC should step up and take responsibility! Had to have the truck towed because it did it 5 times within 15 miles. This time it would shut the engine and lock the power steering. I almost crashed twice. Called AAA and had it tow and is now parked in the garage and still owe $19,000 on it. It is dangerous and can't trust it. I know that I am not the only one and maybe we should do something about it. I know of two people that spend thousand of dollars in expenses without results. HELP
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    pssdatgmcpssdatgmc Member Posts: 17
    Have you tried puting in dry gas and filling on premium ethinol free gas. worked for me so far so good. Than you sue them for the negligence.. I'm on board with you.. I will never ever buy another GM poduct and make sure all of the people I know are familure with these cases. Hope you get it fixed.
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    pssdatgmcpssdatgmc Member Posts: 17
    Caron you prob. won't find these I believe I was getting false numbers. 75979895950 and 7197985950 good luck communicating with these reps. They barely speak english never mind understanding it. They told me noone within the GM corp have any idea whatsoever - what makes that light come on. what a joke.
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    teamradoteamrado Member Posts: 16
    No haven't tried the gas suggestion yet. Picking the truck up after work today from GM dealer. They installed a new throttle body on Wed. and have been driving the truck today. They say they have no issues yet. So far I have a new battery, wiring harness and throttle body. I have no issue with the dealer that I take the truck to as they have always been very good with me in the past. My issue is with GM and how they refuse to identify an on-going issue that has such a potential to create a fatal situation for someone. They basically leave the consumer and the dealers on their own. Great company values!
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    gmcustsvcgmcustsvc Member Posts: 4,252
    annick,

    I would like to look further into your situation. Could you please email me your VIN?

    You can get my email by clicking on gmcustsvc.

    Thank you,
    Caron, GM Customer Service
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    gmcustsvcgmcustsvc Member Posts: 4,252
    Steve,

    I was able to locate your case with GM. I see your fear is to take your vehicle to the dealer for them to throw parts at the vehicle. Unfortunately the only way we can find out why the light came on is to have it diagnosed by a GM dealer. We are not talking about throwing parts at it, just seeing what codes come up so we can find the root problem. You can ask the service people to diagnose the vehicle and call you with it before they begin to perform the repair. The dealers are the technical eyes for GM. They are independently owned and operated; however, they work closely with GM to provide information on causes to concerns, maintenance history etc. I understand your frustration with your situation. As all major companies or corporations, we have standard operating procedures. If you would like to take the vehicle to the dealer please contact me directly so we can work on reopening your case for you.

    Thank you,
    Caron, GM Customer Service
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    yukon11yukon11 Member Posts: 2
    :mad: I have had my 2001 GMC Yukon since 2003 with little to no problems until recent. On 08 Sept 2011 I was traveling to Washington DC at a speed of about 75 mph when all of sudded I started to lose power. Light came on saying "reduced engine power". I pulled over looking to for a shop when all of a sudden everythig returned to normal. I then pressed on to DC with no issues. As I started my trip home from DC, I started getting the same indication I received on my trip there. I checked all my connection to my battery but and everything seem to be normal. I shut down the truck as I did my check. I then restarted and all indication of trouble was once again gone . Today Sept 12, I was headed to back to washingtone but before I pressed on I went to auto zone and had them do a system check and everything came back good ( i.e battery, alternator, starter). I got on the interstate and no less the 5 minutes into the drive I started receiving Reduced Enging Power and a max speed of 20 mph. I will be taking it to the shop tomorrow but from the looks of all the other posting GMC doesn't have an idea of the problem is. If anyone know what the problem could you please list it. :mad:
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    znetrepznetrep Member Posts: 1
    I had this same problem a couple years back. It was a cabling issue. They had to replace the electrical wires in the engine area. Don't know exactly what. The code was intermittent and had to drive around town for the issue to come up so the dealer can read the code. I can probably look up my old invoices to track down the issue. I have a 2003 Yukon XL. Let me know.
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    paco51paco51 Member Posts: 10
    To solve the problem just change. The harness or Chech the pins and wires in the harness that connects to the throutle body good loock
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    teamradoteamrado Member Posts: 16
    If you read my above posts you will see I just went through the same issue. First they checked my connections to throttle body and replaced my battery. Same issue so they replaced the wiring harness to the throttle body. Same issue so they replaced the throttle body. Currently the truck has gone 11 days and no Reduced engine power issue. My son has it at college so it has been driven very little so time will tell if the issue is resolved or not. Total bill for this, $1225.00 dollars. Did anyone from GM offer to offset the cost, not a chance. I have 5 GM vehicles currently dating from 1967 to 2007 and can tell you the ones from 2003 and newer are junk. Will be off shore next as much as I hate to but the quality and customer service from GM is far below standard. Good luck
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    pssdatgmcpssdatgmc Member Posts: 17
    Alls I did was put dry gas in along with premium gas and it has not done it again since. Bet most people get ripped off at the GM dealer. If I would have brought it in I'm sure they would have not put dry gas in .. they would have charged me hundreds if not thousands. Good Luck all dealing with GM they don't care.
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    pssdatgmcpssdatgmc Member Posts: 17
    I put in dry gas and premium gas weeks ago and it has not done it since. Good luck hope this helps.
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    pssdatgmcpssdatgmc Member Posts: 17
    Try dry gas and premium gas. Check ground cable to battery. Hope this helps and good luck.
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    pssdatgmcpssdatgmc Member Posts: 17
    MIne was doing the same thing . I put dry gas in and premium gas tightned my neg. cable to battery and has not done it since. good luck
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    pssdatgmcpssdatgmc Member Posts: 17
    Try dry gas and premium gas. and tighten neg cable on battery worked for me. hope this helps.
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    momof4scmomof4sc Member Posts: 3
    I am more than ready to get in on a class action lawsuit! This is ridiculous how many cars are having this issue! I have filed a complaint at http://www.nhtsa.gov/. As long as we pull over

    My Reduced Engine Power problem started yesterday. I have a 2003 Suburban and can only go 2-3 miles before losing power. I have 4 kids that I run back and forth to school and activites and this is DANGEROUS! My issued started yesterday where, thankfully, I was a few yards from my driveway. Each time it happpens, I can pull over, turn the car off, wait 10-15 seconds and then it cranks back up with no problem. The problem is within 2-3 miles, it happens again. I am having to drive everywhere with my hazard lights on. I only have one car so parking it is not an option but I am scared to death to drive the kids around! I have read all of the posts and have written a list of possible solutions, which my husband will try this evening. We're going to start with the easiest and least expensive and go from there. Wish me luck!
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    momof4scmomof4sc Member Posts: 3
    EVERYONE **PLEASE** go to https://www-odi.nhtsa.dot.gov/ivoq/index.cfm and file a complaint! We have to do something about this!!
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    teamradoteamrado Member Posts: 16
    Not only does everyone need to file a complaint but we all need to post a link to this forum on other sites. This is only one of many sites where people are experiencing the same issues with GM. Collectively we have a better chance for a resolution or recall if we group together.
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    momof4scmomof4sc Member Posts: 3
    edited September 2011
    I hope someone is still reading who can help. As suggested, we wiggled the wires but none of them caused the reduced engine power message. However, when we unhooked the pigtail itself, we got the message. Could this mean that it is the actual pigtail that needs to be replaced? If so, is this a dealership only part?
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    phiwifephiwife Member Posts: 4
    After, you put in the dry gas, how long did it take to work?
    I had a full tank of regular gas in so I didnt want to use the premium at first but it didnt fix the problem. I was desperate so I added a few gallons of premium & the Reduced Engine Power went away & I drove about 20 miles & parked. 2 hours later I go back in & it started all over :-(
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    orlaorla Member Posts: 1
    step#1. disconnect batt neg cable
    step#2.take off plastic cover on top of the eng
    step#3. you well see asmall blackthing like asmall can with elect conntion &soled plasic tube hooked on it just behind throttle body.
    step#4. unsecrew the bolt holding this thing and pull it up.
    chek the (O) ring coller blue. replace it if nassary.
    step#5. put it back by bushing dowen on it hard to make it fit in place.bolt it tightly.
    step#6. put eng cover back on----.connet batt cable and start your new engine !!! :)
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    phiwifephiwife Member Posts: 4
    My hubby took it to our mechanic. He found a loose spark plug wire & a few blown fuses!! Truck is running like new!! :blush: :shades: :)
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    tblazer503tblazer503 Member Posts: 620
    Problem with a class action lawsuit is that there have to be thousands of documented cases of one issue causing problems etc. Unfortunately, imo, all these reduced engine power messages pop up after several years of wear, oil changes, other people sticking their hands in the engine, etc.

    The bulk of the reduced engine problem messages seem to be tied to one of 4 things (give or take)
    1. Broken wire for the connector to the Electronic Throttle body, This included bad pins/broken pins, bad connections, broken wires, etc
    2. Bad Electronic Throttle Body, Seems to be in older models with higher mileage
    3. Bad Grounds for the fuel pump system, or Electronic Throttle body
    4. ... bad gas? o.O new one on me

    I think the biggest flag for me is that most folks don't list their mileage down, but the ones that do, the mileage and age is for a well used vehicle at 75k miles and 4 or 5 years of age. If the mileage is that high, and a wire is damaged in all that time, its a PITA yes, frustrating, yes, but that is much better than a tranny going out...
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    jb04jb04 Member Posts: 4
    i have a 2003 Denali about 2 months ago i was received the engine power reduced warning
    I replaced my accelerator position sensor, it seems to clear up that problem but now i'm
    dealing with the traction active warning and high rpms
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    teamradoteamrado Member Posts: 16
    I would guess that you have never been travelling down a busy two or three lane highway and had a reduced engine power failure. If so you would not use the term frustrating as this is frightening and extremely dangerous. Does age and mileage have something to do with this condition probably. Do you read about older Ford or Dodge trucks with high mileage experiencing the same issue, I don't. How many connectors were on vehicles in the 90's and do they all fail, don't think so. This was new technology for GM and obviously they didn't get it right. They warranty the power train for 100k miles today so your standard of 75k miles means nothing. I don't think anyone here is looking for a free hand out but for GM to fix something that they know is an issue and a safety one at that.
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    barnesbw3barnesbw3 Member Posts: 13
    What are the other sites? I am at the end of my rope? My truck is dead....it's a 2007 Yukon...reduced engine power...all the above. I've filed all of the right claims...Esis GM. I was in an actual accident because of REP. Come to find out, the DEALERSHIP did not document correctly all of my 20 plus times bringing it in and yes...I only brought it in for REP...the wrote things like customer states check engine light on. Customer states emission light on. Cant duplicate problem. Totally sccrewed me and GM says all of my REP claims are alleged even though I have a non running vehicle and the dealership could never fully repair the truck.
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    jonesey_101jonesey_101 Member Posts: 7
    I went through this with my mechanic..he was a retired GM specialist... he was so frustrated. He read everything and tried all of the least expensive suggestions. Then he changed the throttle body and so far it no longer reduces power.
    I understand what you are talking about... it was scary..dangerous and costly repair something that I believe GM knows about. And could safe all consumers of their product a lot of stress, expense and possibly even lives of them or their families if they would come clean.
    I hope this helps
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    jhc17jhc17 Member Posts: 1
    I have read the posts regarding the fix for reduced engine power. I will try to calmly explain this to the "certified mechanics" at the shop I soon will no longer be going to. I bought my Tahoe back in 2006, in 2007 reduced engine power, an indepenent mechanic replaced the throttle body and pig tailed some wires. It happened again in 2008 but this time they could not get a code unless it was in the reduced engine power state. They replaced all the wiring from the throttle body to where ever it goes. 2009 happens again and they replace the throttle body (2 throttle bodies in 3 years). Now August of 2011 again reduced engine power and the dealership again wants to replace the throttle body. 3 throttle bodies in 4 years at my expense is too much. The service manager's reason for this is that "SOME PARTS ARE GOOD AND SOME PARTS ARE BAD", can you believe that crap. We have filed a complaint with GM division and getting no-where fast. The service department will not even look into something else that may be causing the problem because the "COMPUTER SAYS THE THROTTLE BODY IS BAD", diagnostics grabs a code p0220. I just wanted to share my misery with anyone who is having similar problems. I will check out the ground wires and clamps also ask about crank shaft position sensor and valve position sensor. That is what I have come away with from this forum.
    Thanks, will be in touch JC
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    rwolfgangrwolfgang Member Posts: 1
    I am taking my 2009 Tahoe (38K) in today for the same issue. Reduced Engine Power, Service Stabilitrack message. Based on the info in this forum and others I've read, I'm not getting the warm fuzzy feeling that this will be an easy repair.
    We bought this vehicle for it's size and the fact that we travel for our daughters' sporting events. It left us haning last weekend on the way to a tournament. Upsetting and dangerous.
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    jonesey_101jonesey_101 Member Posts: 7
    Yes I know. mine did me that way in the dead of winter. I would have to pull off the highway turn the key off and sit there for a while then it would crank and go for a little while then I would have to do the same thing over again in a 30 mile spand I had to pull over 7 times. (Christmas time so you know how frustrating that was) Anyway my mechanic is a retired GM specialist he couldn't believe it was the throttle body so he tried every less expensive thing he could before he finally gave in a replaced the throttle body. So far so good...
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    datsamoredatsamore Member Posts: 10
    Might want to look at this http://www.youtube.com/watch?v=U2DjMcM_Quk

    I looked, tested and looked and could find proof that I have a bad wire.
    I drove it today, no problem. I am wondering if by completely disassembling both connections that I may have produced a secure connection ultimately.
    I'm keeping my fingers crossed!
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    gmcustsvcgmcustsvc Member Posts: 4,252
    rwolfgang,
    I apologize for your frustrations. Can you please email me you VIN, current mileage, involved dealer, and your complete contact information? As well as anything you hear from the dealer? I look forward to your email.
    Christina
    GM Customer Service
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    coachcwilliscoachcwillis Member Posts: 2
    My 2003 Surburban has right at 195,000 miles on it. I recently had to put a fuel pump on it. Since then I have no fuel guage and now I am getting the Reduced Engine Power warning. I read above that it could be the ground for the fuel pump system? Should I take it back to the mechanic and have him check the ground?
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    coachcwilliscoachcwillis Member Posts: 2
    My 2003 Surburban has right at 195,000 miles on it. I recently had to put a fuel pump on it. Since then I have no fuel guage and now I am getting the Reduced Engine Power warning. I read above that it could be the ground for the fuel pump system? Should I take it back to the mechanic and have him check the ground?
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    idavis1idavis1 Member Posts: 1
    I just had my throttle body replaced because of the reduced engine power and stalling and not restarting right away. They replaced the throttle body and I drove it the next morning. Check engine light came on again until I arrived then it turned off, they reset the relearner curve and said I was good to go, until I tried to start the car and it wouldn't. They checked it out again and said that it was the fuse box because when he tapped it it died. Said it caused my throttle body problem. It caused a short in my cigarette lighter too they had to disconnect it to put a fuse in to get the computer reader to work. , but that should be fixed once I get a new fuse box. I pick it up tomorrow, so we'll see. I hope this helps.
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    richardgmrichardgm Member Posts: 2
    This weekend I was on my way to the Penn State game during the snow storm when my 2009 Tahoe with 37,000 miles lost power and warned of Stability Control off and reduced engine power. Reduced!? How about none at times. It happened on top of a mountain on a busy highway with lots of trucks. I had to pull over several times and do the wait and restart as others have. I could not wait where I was on the narrow siding with traffic flying by in the snow. This was a dangerous situation. At one spot, I almost slid down into the guard rail. I am a loyal american and GM car buyer. I have had serveral GM products including a corvettes. I understand things fail, but it deeply concerns me about the number of similar problems. My plan was to have my kids use this vehicle when they start driving in a few years because I expected this new vehicle would last and be reliable. I not longer that confident. I'm terrified to think what may happen if the engine loses power at a bad time (like with me) when they are driving! It is in the shop now waiting for a diagnosis. I'm hoping they (GM) can ensure me this is not a design flaw and that it is not likely to happen again. I'm not holding my breath.
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    gmcustsvcgmcustsvc Member Posts: 4,252
    Looking forward to an update on the diagnosis. Email Christina if Customer Assistance can help you work with your dealer.

    Best,
    Sarah
    GM Customer Service
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    richardgmrichardgm Member Posts: 2
    Just got my diagnosis. Apparently, some control or sensor wires came dislodged and made contact with the drive shaft which broke or shorted them. This is good news, I think, because it is unlikely to happen again. I would like to learn more to see how it happened in the first place. I don't go four wheeling or anything to force that kind of damage. I did have an oil change a few days before but was told the location of the wires does not make it easy to accidentally move or dislodge them. So I'll need to find out more details when I pick up the Tahoe about how this can happen. This seems related to some of the other problems with connectors and wiring. I'll try to post a follow up if I find out more. Sarah, thanks for your response. My service has been very good and I'm satisfied with the result.
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    gmcustsvcgmcustsvc Member Posts: 4,252
    Excellent! Thank you for the update – I’m thrilled to hear that you had a good experience with service and are satisfied.

    Best,
    Sarah
    GM Customer Service
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    aksterlingroseaksterlingrose Member Posts: 1
    Hey all, my 03 Yukon all of a sudden flashed the Reduced Engine Power message and the engine light came on. Limped into a mechanic to put it on the computer... Long story short, and most of you know how it goes, since you're all experiencing, or have experienced this, but anyways... He said that it was the throttle positioner, or could be the module something or other... (sorry, my husband is the mechanically inclined one in this family....) Anyways - Hubby ordered what he thought it needs.... He got the Throttle positoner body (does that sound right?) and was installing it tonight, when he realized something.... Does anyone having this problem have a K&N Filter? He thought maybe the oil from the filter getting into this Throttle body might ruin it? Any thoughts?
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    teamradoteamrado Member Posts: 16
    My 03 Silverado has a K&N filter. Been on for about 5 years. Had reduced engine power until the throttle body was replaced.
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    breze022breze022 Member Posts: 8
    I've found that its been a few different things on my 2003 Yukon denali after spending 4500 bucks replacing the theas throttle body starter and all my ignition module it was the passive alarm module when I would drive my truck and then go back to start it.it wouldn't start the reduce engine power
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    llyons3llyons3 Member Posts: 4
    I am really worried after reading the previous posts. My 2010 Yukon with 23,000 miles just flashed the check engine light, stability traction control warning and reduced engine power warning today. I have noticed the past few days, that it would stall when I was stopped and then pushed the gas to go. I had Onstar run a scan on Thanksgiving day and they found nothing. Three days later, it goes haywire and starts shaking and reducing the speed to 35 miles an hour. Thank God I was in town and could easily get parked in a nearby driveway. I again had Onstar run a scan and several codes were read then. I had my husband follow me to the local dealership where it now sits until tomorrow when I will be on the phone with them to have this corrected. A vehicle just over 1 year old with only 23,000 miles should not be having these problems!
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