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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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#60 of 74 Re: 2003 Yukon XL - Reduced Engine Power/slow to kick over [skewter] by rsht Apr 03, 2009 (6:30 am)
Replying to: skewter (Apr 02, 2009 12:40 pm) From your description, it sounded to me that there May be a couple of areas you want to check; but before you do anything, I suggest you barrow a good battery charger to fully charge your battery first. Upon fully charged your battery, try to start the engine and then turn it off and back on to see if your clock still resets to 12:00? If it does, you may have a problem with wiring/connection to the ignition switch... As far as the battery charge, how old is the battery? Have you checked the battery fluid/acid level in each cell (be careful, not to smoke or have spark around when checking)? Its possible that you may have a bad alternator like bunchz71 said in the previous post. You can do a primitive check with a volt meter from the battery terminals with ignition off (~12.6VDC) and with the engine running (~14VDC); but the best is use a proper battery/alternator tester, perhaps your local AutoZone, Advanced Auto or similar can help and ID if its the battery or the alternator is due for a replacement. Replies to this message: skewter (Apr 04, 2009 4:37 pm) yukon03 (Apr 14, 2009 5:56 am)
#61 of 74 Re: 2003 Yukon XL - Reduced Engine Power/slow to kick over [rsht] by skewter Apr 04, 2009 (4:37 pm)
Replying to: rsht (Apr 03, 2009 6:30 am) Well - I changed the battery and things are back to normal so far- i checked the alternator and it was running great. the battery was dead dead dead. I hope that was the problem, knock on wood. I appreciate all your responses and if i run into any more issues- i will be back on this board - you guys are great! thanks- Replies to this message: yukon03 (Apr 14, 2009 5:56 am)
#62 of 74 Re: REDUCED ENGINE POWER - PROBLEM SOLVED [bunchz71] by yukon03 Apr 14, 2009 (5:53 am)
Replying to: bunchz71 (Oct 07, 2007 11:31 pm) I am just now experiencing this issue as well and I do not think it is my battery or my alternator. Where did you purchase this harness connector?
#63 of 74 Re: 2003 Yukon XL - Reduced Engine Power/slow to kick over [skewter] by yukon03 Apr 14, 2009 (5:56 am)
Replying to: skewter (Apr 04, 2009 4:37 pm) Greetings! How did you check the alternator? Did you remove it from the vehicle or check it while it was running? I checked my battery with a voltage meter while it was off (12.3v) and when it was on (14.3). The battery is 29 months old and is a Duralast from Auto Zone! Still have the warranty receipt and was getting ready to head up there and get it replaced until I checked the voltages. Would the harness cause the false/positive voltage check! I am grasping for answers to get this fixed the first time as we are going camping next week and I use my Yuk to pull or pop up camper and I am a little stressed right now!! Any assistance will be greatly appreciated!
#64 of 74 Re: FOUND THE PROBLEM!!!!!!!!! [stephc1] by yukon03 Apr 14, 2009 (6:31 am)
Replying to: stephc1 (Sep 17, 2006 5:38 am) Can anyone tell me where the ground wires are on my 2003 Yukon!! I have read almost every post on this site regarding the Reduced Engine Power situation and I have come to the conclusion by troubleshooting my Yukon and just watching the alternator gauge meter fluctuate that this might fix my problem as well!! The battery and the alternator are fine on my vehicle. If someone could please send me a pic of the ground wire location and that computer/battery harness wire everyone is referring to I would greatly appreciate it!!! My Yuk has been sitting in the driveway for two weeks now because I am afraid to drive it in fear of getting stuck or involved in an accident!! Going camping next week with the pop camper and need to have this problem resolved by then!!Thanks for all of your support, this forum rocks!!!!!! Replies to this message: rsht (Apr 16, 2009 3:54 pm)
#65 of 74 Reduced Engine Power repair results? by yukon03 Apr 14, 2009 (6:38 am)
Are you having anymore issues with the Reduced Engine Power problem after you changed the battery?
#66 of 74 Re: FOUND THE PROBLEM!!!!!!!!! [yukon03] by rsht Apr 16, 2009 (3:54 pm)
Replying to: yukon03 (Apr 14, 2009 6:31 am) See post #22 from bunchz71, and the provided picture from him/her may give you an idea of the wiring...
#67 of 74 Help! Reduced Engine Power Warning by wendygee Jul 07, 2009 (5:02 am)
Hello! I have a 2004 Chevy Avalanche and my Reduced Engine Power Warning flashed. Upon conducting a diagnostic check the following popped up: P0120 Throttle/Pedal Pos sensor A clef malf P0156 025 clef malf 2/2 P0157 025 clef low volts 2 2 P0332 knock sensor 2 clef low input bank 2 P0496 Evap high purge flow fault P2135 Throttle/pedal position sens/SW A/B voltage correlation I HATE the idea of going to a dealer to have the issue taken care of because I am hoping it's either faulty wiring or a sensor and in owning cars for over 20 years I have yet to have a good experience with taking my car/truck to a dealer to have it repaired. Does anyone have any suggestions, guidance, or direction? Even if I could get my hands on an Avalanche electrical schematic I may have a shot at troubleshooting this issue? the biggest problem is that the engine will not accelerate higher than 20 miles per hour once the warning comes on, and it comes on sporadically so it needs to be taken care of ASAP. Help anyone? Thank you!!! Replies to this message: rsht (Jul 12, 2009 7:07 am)
#68 of 74 Read Previous topics by bunchz71 Jul 07, 2009 (9:17 pm)
I would suggest to try and read some of the earlier post in this forum on this topic. Lots of good info. Thanks,
#69 of 74 Re: Help! Reduced Engine Power Warning [wendygee] by rsht Jul 12, 2009 (7:07 am)
Replying to: wendygee (Jul 07, 2009 5:02 am) Wendygee, I saw your post a few days ago and was not able to suggest anything until now... Basically, from your list of trouble codes and what I can find is to begin your trouble shooting from the Throttle Pedal position sensor for proper resistance reading and if its physically secured in place and etc. Sorry, I could not find the service manual for your particular model year, so, you may have to check that in your local library or GMC Service Department for the sensor spec and location for trouble shoot. Good Luck!   As far as the Knock Sensor and other codes may be triggered by the pedal sensor, so zoom in on the pedal sensor first.

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