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Yukon "Reduced Engine Power message"

74 messages,  Last post on Oct 12, 2009 at 9:54 PM

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What is this discussion about? GMC Yukon Denali, GMC Yukon XL, Car Safety, Electrical, Engine, SUV

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#27 of 74 Re: REDUCED ENGINE POWER - PROBLEM [stephc1] by bunchz71 Sep 11, 2007 (5:33 pm)
Replying to: stephc1 (Sep 11, 2007 4:00 am) Since I have replaced the plugin where my broken wire was, I have not had ANY problems. It was obviously my problem. My recommendation to anyone that has this problem very intermittently, is to start the vehicle while it is not in Reduced Engine Power Mode and have someone sit in the vehicle, while you wiggle all the wiring, plugs etc on the throttle body. This is the way I solved my problem. The plug in that i had to replace was not cheap, but its worth it to know that it is not going to go into reduced engine mode while a semi is on my ass on the interstate.
#28 of 74 Reduced Power by siemsen Sep 17, 2007 (7:43 pm)
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.
#29 of 74 Reduced Engine Power by azchevfan Sep 24, 2007 (4:29 pm)
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. Replies to this message: bunchz71 (Sep 25, 2007 4:49 pm)
#30 of 74 Re: Reduced Engine Power [azchevfan] by bunchz71 Sep 25, 2007 (4:49 pm)
Replying to: azchevfan (Sep 24, 2007 4:29 pm) looks like you had the exact same problem as I did. It was even the yellow wire that was broke first. The yellow wire was broken with previous owner, this time with me, it was the wire beside it. I dont fully understand the reason for the breaking of wires there. The only thing that I can figure is that its right by the oil filler cap. Maybe it just gets bumped a lot while adding oil etc. Was your plugin like $120??
#31 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by heymilton Oct 06, 2007 (3:08 am)
Replying to: bunchz71 (Aug 27, 2007 8:40 pm) hey bunchz71   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 Replies to this message: bunchz71 (Oct 07, 2007 11:31 pm) heymilton (Oct 18, 2007 9:39 am) bunchz71 (Oct 18, 2007 9:50 pm) yukon03 (Apr 14, 2009 5:53 am)
#32 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [heymilton] by bunchz71 Oct 07, 2007 (11:31 pm)
Replying to: heymilton (Oct 06, 2007 3:08 am) Hey,   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 Replies to this message: heymilton (Oct 18, 2007 9:39 am) bunchz71 (Oct 18, 2007 9:50 pm) yukon03 (Apr 14, 2009 5:53 am)
#33 of 74 Re: update on the reduced engone power thing.. BEWARE!!!! [bonddog] by a1cobler Oct 17, 2007 (1:12 pm)
Replying to: bonddog (Sep 05, 2006 1:06 pm) Just wanted to alert everyone to another thing to check besides the Idle Control Wires and contacts. My 2003 Yukon XL had quit several times too by loosing power right in the middle of 70 mph on the highway. Received the Reduced Engine Power message on the last time it quit. While looking for a dealer to take my truck to I found this forum, which gave me a clue for my mechanic to look at. Here's the deal. In addition to replacing your Idle Control Body you can also have your mechanic take a loose the idle control body and check to see if it is clogged up. My idle control wires and contacts were fine. However the control body itself was extremely gummed up over 4 yrs of wear. My mechanic took it apart and used some carbuerator cleaner to thoroughly clean it out. Put everything back together and I have been good since. Cost me a few dollars for an hour worth of his time. Replies to this message: beaudoin (Oct 17, 2007 1:46 pm)
#34 of 74 Re: update on the reduced engone power thing.. BEWARE!!!! [a1cobler] by beaudoin Oct 17, 2007 (1:46 pm)
Replying to: a1cobler (Oct 17, 2007 1:12 pm) Hey Bonddog,I dont want to burst your bubble on this but being a tech, and being very familiar with these issues,I just want to say that an Idle control valve does not have the capabilities of making the reduce power message come on. It is strictly for an idle control of the engine,the reduced power light and I have worked on this problem several times is usually caused by rust build up under the front abs sensors....I suspect that you will see your problem re-occur. hank
#35 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by heymilton Oct 18, 2007 (9:39 am)
Replying to: bunchz71 (Oct 07, 2007 11:31 pm) Alright here is my latest. After this thing died and I could not get it going again. It was stuck in reduced enging power I finally had to make some drastic moves. The dealership wanted to replace the tac module on the firewall. But after I thought I had fixed it when I replaced the brown and yellow wire ends that connected to the trottle body and had 2 months of success I fiqured it had to have something to do with that. I ended up replacing the throttle body. The cheapskate in me found one in a junkyard on a totaled out yukon. It cost me 175 shipped to the door. Replaced it in about 20 minutes, and it fired right up. Runs like a champ.   I am hoping this solves the problem and not just another teaser for a couple of months. Replies to this message: bunchz71 (Oct 18, 2007 9:50 pm)
#36 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [heymilton] by bunchz71 Oct 18, 2007 (9:50 pm)
Replying to: heymilton (Oct 18, 2007 9:39 am) Did you disconnect the battery for any reason during the swap-out ? If so this may have cleared out the code and started back up with no problems after the code was cleared. Hopefully you have fixed your prob. I still have not had any trouble with mine since i replaced the harness. Sounds like there is about 50 things that can make the Reduced Engine Power. lol

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