2004 GMC Envoy Transmission problem
I am trying to find out the solutions to the following symptoms. SES light came on,
transmission quit shifting. 2nd and 3rd gear only gears work, but have to shift manually.
When car sits for a time transmission works fine at first but after driving 4-5 minutes
problem start up again. Drove two days ago SES light not on transmission is fine. Today
problem is back. Ignition interlock device hasn't worked since buying car 7 months ago.
To help us find a solution, we need to know why the SES light is on, so we need you to post the codes that you can get scanned at any local auto parts store or borrow a scanner from a friend. Why haven't you fixed the ignition interlock yet?
Sounds a lot like an ignition switch dropping a voltage leg. Look into a switch. Really easy to tell by checking voltages
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