Question about 2003 GMC Envoy

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2002 GMC Envoy is having a tough time shifting at 85,000 miles. It also starts & idles at higher RPMs. The car is also much noiser from the engin & fan. What is wrong - the trans., motor needing a tune-up, bad gas, etc?

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  • 760Locksmith Aug 21, 2008

    I have an 03 SLT 4wd Auto ... Its having a simalar prob... It kicked a service light, has a massive lack of power almost like its in 3rd gear when accelerating from a stop, makes a grunting kinda grinding sound not metalic though. While accelerating under moderate throtle its reluctant to shift unless the throtle is slamed and released and slamed again. However, seems to shift fine at minimal throtle... I scanned it with an obd II handheld unit and it gave me error codes : 756 & 172. I erased the Memory and the codes havent returned, however, the prob still remains... 756 is a shift solinoid error, 172 is a misfire / Rich Bank... Any Ideas?

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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.

Posted on Dec 01, 2008

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Replace fan clutch

Posted on Dec 17, 2008

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Check for fan clutch problems.

Posted on Oct 23, 2008

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