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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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#71 of 74 i THOUGHT i fixed this problem by bandit79mpr Oct 07, 2009 (5:26 pm)
i own a 2003 silverado 1500hd crew cab, 6.0 automatic. i fought the reduced engine powre thing for almost a year, kept throwing the code of bad tpp, replaced it to no avail, tuned it up to no avail, new wiring harness from tpp (on pedal) to tac module to no avail, new throttle body and wiring harness to no avail........at this point i had spent almost $2000.00 and it was still running like crap, took it to the dealer for reprogramming and another throttle body (free of charge after i blew up in the mechanics face) and it ran fine for 2 days and i took it back again in may 2009 and the mechanic was gone when i went to pick up the truck, i asked the guy at the counter what he did this time and he said that the head mechanic had done "something" with the tpp but he was'nt sure what. the truck ran like a top all summer with trips to the mountains towing my camper, runnung all over the place looking for parts for my restoration projects and daily trips to work. around the middle of september the temperature started dropping into 40's and 50's at night and guess what?, that good ol reduced engine power light came on again. the mechanic that worked on the truck and "fixed" it cannot be found because the dealership has since closed down. so , does temperature affect whatever is happening? (the same tpp code is being sent) can i only drive this truck inthe summertime? my truck has 76,000 miles on it now and it is useless to me if i cannot safely drive it. i have owned,driven, and worked on chevy cars and trucks for the last 20 years and this new generation of wireless throttles have convinced me to never own another one. i think i'm gonna go buy a toyota............................ p.s. i had a little luck with mine if the light would'nt go away after 4 or 5 starts by unhooking the positive battery terminal for 5 mins or so , this usually gives me 6 or 7 trouble free starts before i have to do it again. good luck and if anybody else has this problem and it seems temperature related like mine, please let me know how you finally fix it. Replies to this message: rsht (Oct 08, 2009 4:26 am) yukon03 (Oct 08, 2009 5:30 am) bunchz71 (Oct 12, 2009 9:54 pm)
#72 of 74 Re: i THOUGHT i fixed this problem [bandit79mpr] by rsht Oct 08, 2009 (4:26 am)
Replying to: bandit79mpr (Oct 07, 2009 5:26 pm) Just wondering if you know the Trouble Code(s)? I assume something in the range of: P0120, P0122, P0220, P0222, P2135....... Replies to this message: yukon03 (Oct 08, 2009 5:30 am)
#73 of 74 Re: i THOUGHT i fixed this problem [rsht] by yukon03 Oct 08, 2009 (5:30 am)
Replying to: rsht (Oct 08, 2009 4:26 am) Greetings! I resolved my issue by simply replacing the battery. A low battery will trigger that error code. Good luck!
#74 of 74 Re: i THOUGHT i fixed this problem [bandit79mpr] by bunchz71 Oct 12, 2009 (9:54 pm)
Replying to: bandit79mpr (Oct 07, 2009 5:26 pm) My suggestion would be to look post 22 of this forum. I apologize if the picture didnt work before, my photobucket account went inactive for a while since I did not log in. I still to this day do not have any problems with my truck after I replace the harness end. You did say you replaced a lot of wires but in the picture is the one I replaced. Have someone wiggle the wires when it is not in Reduced Engine Power Mode. It may save you a lot of time and money.

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