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  1. T

    Reduced Power

    Ok. Replaced the throttle body wiring harness. Also replaced the T.A.C. module.. Seen the date on my battery of 8/16. So just to make sure I replaced the battery. Still will not come out of reduced power mode. To recap. Plugs and wires were changed. Still random miss fire. All coils were...
  2. T

    2003 Yukon Reduced Engine Power

    Ok. Replaced the throttle body wiring harness. Also replaced the T.A.C. module.. Seen the date on my battery of 8/16. So just to make sure I replaced the battery. Still will not come out of reduced power mode. To recap. Plugs and wires were changed. Still random miss fire. All coils were...
  3. T

    2003 Yukon Reduced Engine Power

    I did see that. We had already replaced all the grounds prior to seeing that. That helped rule that out. Thank you for sending me the info. Everyone that has replied has been a big help.
  4. T

    2003 Yukon Reduced Engine Power

    I have been having issues with my 03 Yukon. Runs like crap, no power and goes into Reduced Engine Power mode frequently. I have changed plugs, wires and all coils a week ago dure to random misfires. I previously replaced the throttle body with a new tps on it and the accelerator pedal module. No...

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