Question about 2003 GMC Yukon

2 Answers

Reduced Engine Power error on display

I am getting a "Reduced Engine Power" display on my 03 Yukon 5.3L and I have read that there are several things that can cause this error. Need to find out have to nail down the right troubleshooting tool to fix it the first time around. Please help ASAP!!!

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  • 4 more comments 
  • ranger110654 Apr 14, 2009

    I checked the battery with the car off and it read around 12.3 volts, and 14.50 when the engine was running. Are you talking about the little Red Box that is incorpated into the battery harness? If that is the problem what is the technical name for that part? Thank you so much for your quick reply!!!

  • ranger110654 Apr 14, 2009

    Okay, more info to pass along! I just started it up, sluggish as usual, but no error. However, the alt gauge was fluctuating between 10-12 volts consitantly! Would that harness cause this type of sympton? I don't want to pull my battery out or alternator just to be checked just to find out they are okay. Need to fix it the first time around! Also, the harness connector I have been reading about is a ACDELCO PT1572. Do you know if Auto Zone or Advanced Auto carries this part?

  • ranger110654 Apr 14, 2009

    Is this a plug and play repair?

  • ranger110654 Apr 14, 2009

    Just got off the phone with AutoZone and the ACDELCO part number PT1572 is not in their system!

  • ranger110654 Apr 14, 2009

    No Sir, no Kragens in Florida!!!

  • ranger110654 Apr 14, 2009

    I found it and it's $157 flipping dollars! I have learned more about this problem so I need to know if you can send me a pic of the ground wires and that harness as well.

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Its your connetor at the throttle. try putting some die electric grease in the throttle connector and check the wires there to see if they are broken or open.good luck.

Posted on Apr 19, 2009

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Check your main wiring harness, This seems to be a pretty common problem with this vehicle. The main wiring harness is located in the engine compartment near the battery. Check the wires out very well. The other thing that you can check which would cause this is your battery and make sure that it does still have about 12 volts DC

Posted on Apr 14, 2009

  • 3 more comments 
  • Jeremy Reddick
    Jeremy Reddick Apr 14, 2009

    Yes sorry should have been more descriptive. It is your power wiring harness it contects to your computer control there should be 8 wires running out of it?

  • Jeremy Reddick
    Jeremy Reddick Apr 14, 2009

    Autozone does carry the part. This problem with your alternator is still caused by the same thing. You can try to start and stop the car three times then take your key out reinsert the key and then dont start it but take it to the last click right before it starts two times and then start the car

  • Jeremy Reddick
    Jeremy Reddick Apr 14, 2009

    lol, yes but at the sam time it is a diagnostics. It will tell me if you need to replace the acdelco

  • Jeremy Reddick
    Jeremy Reddick Apr 14, 2009

    Do you have a Kragen?
    If so they have the part and the number in there system


  • Jeremy Reddick
    Jeremy Reddick Apr 14, 2009

    Dang, cause they have the part. The name is a connectorem I would check the dealership then



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