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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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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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| I want to thank everyone for the fantastic information. I have a 2001 Yukon and have been experiencing reduced power intermittenly on a daily basis. It only happens at startup. I shut it off, wait a few seconds, start it back up and then give it a good rev. 8 out of 10 times that does it. The other two takes another cycle. It runs great until I shut it off again. The idiot light comes on occasionally as well. If I run it pretty hard, it usually shuts off. So far my mechanic has replaced the catalytic converter, computer, and performed a fuel system flush. Luckily it is a "mom and pop" establishment and they have not charged me for the computer, fuel flush, or any of the time they have taken to diagnose it. I'm sure they feel that charging me for a cat which did not correct the problem was enough. I'm going back armed with the information you all have provided on the loose ground wire diagnosis. Hopefully that will do it. I will let you know. | |
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I have a 2003 Silverado 2500 HD with a 6.0 liter engine. I recognize that I have a different machine, but I would think that there are similar engine components between the vehicles. I have been experienceing Reduced Engine Power message several times over the past 4 days. Local parts store diagnostic check said Throttle Position Sensor is bad. Sensor is not available at parts stores... only through dealership. Parts dept at dealership said TPS only comes as a complete package with a new Throttle Body Assembly. I purchased it and installed it only to have Reduced Engine Power message displayed again. I got truck home (at 15 MPH!) and started to examine wiring harness that plugs into the TPS. On my truck, the yellow wire was worn through and is shorting out. A simple wiring connector was the solution, rather than a $260 part. I encourage anyone to check wiring first.
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Replying to: azchevfan (Sep 24, 2007 4:29 pm) |
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Replying to: bunchz71 (Aug 27, 2007 8:40 pm) I just had the problem again!!! ! unbelievebly fustrating. are you saying that you replace this connector ACD# PT1572 and the wiring to fix the problem???? It was not the brown or yellow wire on the other side?? I am ready to dump this thing. Btw did the wiring come with this connector or is this the price for just the connector?? Thanks, John |
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Replying to: heymilton (Oct 06, 2007 3:08 am) This is what I replaced. Click on the link below and see the plug-in. The connector comes with about 15" or so of "ALL WHITE WIRES". You need to replace one at a time so you do no get them crossed. It comes with 8 wire conectors also. I am not saying that your problem was the same as mine, but its possible. The main reason I went ahead and changed out the whole plug was because the wire was broke off about 1-1/16 from where the wire went into the connector and it made it hard to get a good solder job on the broken wire. I would recommed again wiggling wires with the engine running and have someone sit in the vehicle and let you know when it goes into Reduced Engine Mode. Its best to do it this was that way you know which wires you moved to create the error. Let me know if you need more help. I ll help if I can. http://198.208.187.182/internet/ViewPartImage.jsp?acdelcoPartNumber=pt1572
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