Question about 2003 GMC Envoy

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4.2 loosing power only during highway speeds. Engine RPMs shoot up to 3000 or more fan clutch seems to be engaged sounds like a jet

This has only occurred twice a couple months apart and is not displaying any codes

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Bad coil pack

Posted on Apr 07, 2015

Testimonial: "Your last post about the tranny cooler may have some weight. Iam going to look further into it. Thanks. Last Nov I replaced engine and tranny. The one thing I know I didn't replace was the cooler. The thing that is puzzling is that the tranny fluid is still quite transparent. This was leading me in the direction of electrical either the PCM or the fan clutch. Without any codes I am just guessing. The fact that it does not occur on a regular basis makes it even more puzzling."

  • Larry Keeno
    Larry Keeno Apr 07, 2015

    I need to describe further, the transmission will not shift correctly when this condition happens. On both occasions after I stopped for a few minutes the engine would start fine and the transmission would shift fine

  •  johnny rebel
    johnny rebel Apr 07, 2015

    its getting too hot then,maybe you need a tranny cooler or the one you have might be clogged

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I ran into this concern with my 2002 and my wife ran into the almost identical problem with her 2003. this may sound silly,, but it was the clutch fan. Extreme loss of power from time to time came first. Then a roar of the what seemed like the engine when stopping. Actually cut off after it started to roar at highway speeds, and had absolutely no excelleration from time to time. Sometimes all of the symptoms completely went away. After taking mine to the dealer several times, finally they got it right and replaced the fan clutch. When my wifes 2003 SLt started doing the exact same thing as my 2002 had done, we both knew what the problem was, and the dealer did a quick fix. $600.00. Perhaps this should have been a recall feature, but never was. Everyone that I know that has an envoy, somewhere around the 72,000 and 103,000 mile mark has had this problem and have had to have the clutch fan replaced. It may sound like the vehicle is going to have to be junked,, but that is all it needs.

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