Question about 1999 GMC Suburban

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Not supported function with PCM

I have a 1997 GMC Suburban k1500 (5.7L). When taking it in for its bi-annual emission test, it failed the test due to a message from the computer dealing with the oxygen sensors stating that it was a non-supported function. The garage that's working on the vehicle reflashed the computer thinking the programming had gotten messed up with no luck. They did manually check and found (2) malfunctioning oxygen sensors. One non-working and one with real slow response. But they stated that would result in the computer saying that it was a non-supported function. They supposedly called the gmc tech desk as well as the emissions tech desk and no one could figure it out. They now want to replace the entire PCM. Does this seem legitimate?

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Hi!

I suggest instead of getting entire PCM replaced you may please swipe your GMC 1997 GMC Suburban K 1500 with another latest version. Because the replacement will cost you a lot and there is no warranty or guarantee that the Suburban will function normally after the entire PCM replacement.

Please do accept this solution and revert for further assistance.

Thanks
Rylee

Posted on Jun 30, 2009

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Technical Description:
EVAP Control System Canister Vent Solenoid Circuit Malfunction
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