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Just bought my wifa an envoy several months back. On her way home the CEL came on. I went out to pull the code but can not find the diagnostic port under the dash like on our trucks. Does anyone know where it is. I am a member on the envoy forum, but posted a question several months back that still has not been answered.
 

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IIRC it might be covered up by a small plastic shield under the steering wheel somewhere.

I have seen them in the glove box on a few GM vehicles :cool:



 
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