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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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#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
#37 of 74 Re: FOUND THE PROBLEM!!!!!!!!! [stephc1] by twidget2 Dec 04, 2007 (2:18 pm)
Replying to: stephc1 (Sep 17, 2006 5:38 am) GREATTTTTTT!!!!   My wife called on her way home and had the "REDUCED ENGINE POWER" message and the check engine light was on, 2003 GMC Sierra 1500, she did not think she would make it home, just a few blocks away. I checked the net and found this post and started checking at the battery and almost right away found that the negitive battery lead was not tight where it connects to the block, it was not arcing loose, just not snug, a 1/2" wrench to thighten the bolt and the engine idle returned to normal, the message and check engine light is off and it drives normal. Thanks for the help!!!
#38 of 74 Reduced engine power by 07classic1 Dec 14, 2007 (3:13 pm)
I have an 07 1500 Sierra Classic with the 4.8 that just started having this problem. The first time was just before thanksgiving but after shutting it down it fired up and ran right so I just pulled the codes and they read that the TPS was "out of range". The check engine light turned off after messing with a few things: gas cap + intake. The thing is the problem just resurfaced again. I've got an appointment with the dealer as its still under warranty. From the sounds of things they are going to jerry rig a fix so can anyone provide any info that might help save me from constant trips to the dealer?
#39 of 74 Re: 03 Yukon XL DEAD :( [stephc1] by danny57 Dec 29, 2007 (11:39 am)
Replying to: stephc1 (Sep 13, 2006 3:47 pm) it seems that everyone is talking about yukons. my son has a 2000 pontiac firebird with a 3.8 liter v6 engine. he has had the car for 16 months. he had problems with the engine so i bought another 3.8 v6 and now we are seeing the "reduced engine power" light come on. what gives? Replies to this message: chipjumper (Dec 30, 2007 7:33 pm)
#40 of 74 P1516 by chipjumper Dec 30, 2007 (7:30 pm)
guys, after sifting through many posts and many different forums (like gm-trucks.com) i have come to this conclusion:   -Replace wire harness to throttle body (get the AC Delco OEM harness) probably    This is from GM:   The PCM detects that the commanded and actual throttle positions are not within a calibrated range of each other. The above condition is met for less than 1 second.   Step 1. Tighten ground G103 located next to the right cylinder head (passenger side) just below the head and mounted into the block. The ground uses a 13 mm bolt head mounted vertically to the engine block just above the bell housing. G104 located behind the left cylinder head has also been found to cause this concern.   Inspect throttle body torque. If the throttle body is improperly torqued to the intake manifold, remove throttle body and retorque the throttle body mounting nuts per SI in a two step process: 45 lb. / inches. on the 1st pass, and then 89 lb. / inches on the final pass.   Verify all electrical connections especially right at the TAC module. There have been reports of the plastic retaining tab in the connector missing causing poor contact especially on rough roads   Road test vehicle to determine if code re-sets/condition re-occurs. If not return it to customer.   Step 2. If condition is not corrected using above procedure, or re-occurs, replace throttle body assembly.
#41 of 74 Re: 03 Yukon XL DEAD :( [danny57] by chipjumper Dec 30, 2007 (7:33 pm)
Replying to: danny57 (Dec 29, 2007 11:39 am) In regards to the person with the 2000 Firebird ---   I didn't know that car came with a Driver Information Center (DIC). Are you sure you're just getting a "Service Engine Soon" light or can you actually read, "Reduced Engine Power"?   Those cars didn't use electronic throttles, at least I didn't think so.

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