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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

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

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#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.
#42 of 74 Re: GMC Yukon "Reduced Engine Power message" [stephc1] by problems2 Jan 01, 2008 (1:38 pm)
Replying to: stephc1 (Sep 01, 2006 5:07 am) I have a 2003 Yukon XL Denali the Traction Control Light comes on the the Message Reduced Power comes on the it stalls and i can stop and restart it will run fine the rest of the day. Is there any new suggestions is it still ok to drive or need a immediate fix. This has just started since it has got cold and i nedd to put brakes on the rear could this be part of problem Replies to this message: bmcg (Jan 18, 2008 7:15 am)
#43 of 74 Re: GMC Yukon "Reduced Engine Power message" [problems2] by bmcg Jan 18, 2008 (7:15 am)
Replying to: problems2 (Jan 01, 2008 1:38 pm) Exact same problem just started for me for me...On startup, Traction Control Light comes on and the message Reduced Engine Power comes on. Engine is limited to 2000rpm. The 1st time this happened I shut the truck off, turned it back on, and it's fine. Other time I tried 3 starts with no luck, an hour later...I tried it again, and it's fine. Vehicle is an '03 Escalade. Any input would be appreciated, Thanks
#44 of 74 Traction Control Reduced Power/Stablity brake syst by problems2 Jan 21, 2008 (1:49 am)
Well i have finally solved my problem we replaced the throttle body and the wiring harness and took all grounds loose sanded them the tightened them back. I got this from a message a fellow left on this site and it worked for me not had this problem for two weeks and i was having it daily.   Thanks to all
#45 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by momtofour Mar 29, 2008 (12:50 pm)
Replying to: bunchz71 (Aug 07, 2007 9:10 pm) I cannot thank you enough for taking the time to post all of this information; I especially appreciate the photobucket picture, so I could locate what everyone was talking about. I went outside immediately, gently wiggled the wiring harness, restarted my 2003 Chevy Suburban... the REDUCED ENGINE POWER message was GONE... okay the engine light icon is still on, but I can drive my car now to the parts store... and thank you also for providing the part info and numbers and pictures... this has saved me a bunch of additional time...   I thought we were going to be involved in a horrible accident today on the highway... YES, this happened on the highway and we had an 18-wheeler baring down on us with no where to pull off... I did have the forethought to put on my hazards, and most people were able to change lanes and pass us... but the 18-wheeler could not move over, and for some reason was refusing to slow down at a more reasonable speed... he was inches from my bumper before he finally changed lanes... I had 3 of my 4 children with me, all under the age of 5 in carseats... I was so scared...   I cannot believe GM has not recalled or addressed this problem proactively... They will be hearing from me via certified letter...   So thank you EVERYONE, but most especially, you... you covered all the bases for us... and lastly, I'm sure you saved us a bundle of money, something we cannot afford to be frivolous with these days...   Laura (mom2four)
#46 of 74 engine light by moe1954 Apr 23, 2008 (3:53 pm)
I have a 2004 Yukon. My engine light has come on about 4 times sense I bought the thing. I keep taking it back to the dealer and they run dynostic on it and say that the fuel cap is not put on right. The last time I went there they put a new cap on it but the new cap goes on to easy and it dosn't seal good. It dosn't have the same seal in it the last cap I had, and now the light is back on. I guess I will put it in the repair shop if you cannot help me with this. I don't know if I should keep buying fuel caps or is there some wiring somewhere I can check. I don't know where to locate this. Thank you. Replies to this message: rsht (Apr 24, 2008 5:57 am)
#47 of 74 Re: engine light [moe1954] by rsht Apr 24, 2008 (5:57 am)
Replying to: moe1954 (Apr 23, 2008 3:53 pm) Not sure if you still have the old fuel cap? Some times the pressure relief valve inside the cap may be partially stuck, use a paper clip to gently push (through the little pin hole in the center of the cap) on valve to make sure it moves smoothly; as far as the cap seal (if you still have the old one), I would clean the seal and its contact surface on the filler opening. If all failed, personally, I would then hook-up an ODB-II scanner (your local AutoZone store can do it for free if you don't have a scanner) to see what is/are the trouble code(s) that associated with the Check Engine light... If the problem is with the fuel cap, the Check Engine light should go off fairly soon after the cap is on tight (~5-clicks...).   Just for reference, one time I left the cap off, my Check Engine light came on before I was even out of the gas station parking lot. After I put the cap back on, less than a mile, the Check Engine light went off by itself...
#48 of 74 hi by flex4 May 15, 2008 (1:52 am)
i have yukon XL 2001 model some time when i drive a car showing message REDUCED ENGINE POWER so you can help me on this Replies to this message: rsht (May 15, 2008 3:41 am)

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