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SUVs GMC Yukon Yukon "Reduced Engine Power message"
74 messages, Last post on Oct 12, 2009 at 9:54 PM
You are in the GMC Yukon Forum. Your Hosts are steve_ & tidester
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 Hello to all. I am new at this, this is the first time that I have looked at this site. I just took my truck into the shop today for the second time in three weeks for the reduced engine power coming on. When it happens, it runs like shit. the first time I tool it is they sais that the machine told them to replace the throttle positioning sensor, well guess what, it told them the same thing today. One more time and do I have what they consider a lemon. Any feedback, what do I do.
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By the way I have a 2006 Chevy crew cab LT Silverado 
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Replying to: hershbbk (Apr 15, 2007 8:13 am) |
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| I started this thread last August 2006. Since they replaced my Throttlebody I have not had the "Reduced Engine Power" problem. It's been 9 months now and trouble free. It turned out it was the throttlebody all along but the GMC mechanics did a lousy job of fixing it the first few times in that they didn't notice that they had crimpped some wire when they installed it causing it to malfunction. Believe it or not some newer Corvettes have experienced this problem too. | |
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Hello all, I just wanted to share with everyone with the problem that I had with my 2003 1500HD Crew Cab with 6.0 Liter. My truck would go into reduced engine power off and on. Sometimes one a week, sometimes 5 times on a 20 mile trip. My problem was a broken wire on the plug in going in to the throttle body. In the picture is the plug in that had caused me all of my pain and grief....... My problem was very intermittent and was hard to diagnose. I started vehicle and with all codes clear. I wiggled the wiring harness in the picture and vehicle spit and sputtered, throwing it into reduced engine power mode, and then smoothed out to a smooth idle. I disconnected the plug and pulled wires out of plug end and found a broken wire. Mine was a brown wire with white stripe. BUT, what was interesting, was that this vehicle had apparently had the smae problem with previous owner, becuz there was another wire (yellow wire) right beside the one that I found broken already soldered up and taped from where it had apparently happened before. This was my problem and not my truck is running great, and actually even idles better that before. Hope this helps with any problems that anyone else is having. I know this problem can be very irritating. http://i184.photobucket.com/albums/x191/bunchtst/BrokenWire.jpg |
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Replying to: bunchz71 (Aug 07, 2007 9:10 pm) Frustrated I told them to look at it and fiqure it out. I searched out the best mechanic and he was knowledgeable and worked on it. Said it was a bad ground , charged me 80 bucks and I was on my way. Problem was 5 miles down the road i got reduced engine power again. Turned around and took it back to them. long story short they had it for a week and said they could not fiqure it out . they wanted to throw parts at it starting with a 400 dollar one. I read your thread and told them to check out the wires at the throttle body, they told me they already did, and refused to look at them again. I went and got the truck and decided to go with your suggestion , took apart the cannon plug and found NO broken wires. Decided to replaced the metal contact pins themselves. cut them off and went to a different dealership to parts and look thru a ton of contact until i found the exact ones. replaced them and soldered them just in case and I HAVENT HAD THE PROBLEM SINCE. Im guessing it was just a bad contact pin, just enough to trip the computer. Thanks for the info , your time writing your thread probably saved me hundreds of dollars. FYI I have never taken a vehicle in my entire life to a dealership for repair , they are thiefs. Look and ask around for a local repair shop with a good reputation. you will save alot of money, and I am NOT talking about a Firestone or something like that, more of a mom and pa shop BTW,,,,,,,,,,,,I am a american airlines aircraft mechanic for the last 20 years
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Replying to: heymilton (Aug 23, 2007 4:49 pm)  the chevy dealership. I about freaked when he told me how much it was. But I figured, this will fix my truck and I wont have to worry about this annoying problem. If you do want to replace yours as I did, here is the part number. AC Delco ACD# PT1572 GM# 88986255 Hope this helps.
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I have continually had the same messages displayed on my 2004 Yukon XL. (Reduced Engine Power/Stability Control Disabled/Service 4 Wheel Drive along with the check engine light.) Yesterday for the first time it would not go over about 20 mph. First time it happened the dealer said it was the battery. It was okay for a few weeks, lights on again, but went out the following day. Then it happened a third time, took it to another shop and now is back in the shop again. I will be getting him the information everyone has posted. Have those who thought they had the problem resolved still doing okay, no more lights & messages? By what I have been reading, many people are having the same problems. How do I report this problem to GM? Would a letter writing campaign to GM help this matter? Of course, this problem started about 4000 miles after warranty expired.
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Replying to: afw (Sep 11, 2007 3:46 am) When I contacted GM they really just did not care. This issue shows up in the TSBs but what it comes down to is this: Until it kills someone, they won't do anything. I'd really like to know if this has been the cause of any serious accidents. If GM knows, they aren't talking. Best of luck to you. I know how frustrating this problem is and I don't wish it on anyone. 
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Replying to: stephc1 (Sep 11, 2007 4:00 am) |
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