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GMC
Envoy
Drivetrain
Transmission
Fluid
Transmission
2003 GMC ENVOY
170 MILES • 6 CYL
MIKE BOLTON
MEMBER
1 POST
Reverse quit otherwise drives well. Transmission fluid looks like it's never bin changed no colour and looks thin
Jul 28, 2017 at 7:43 AM
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STRAILER
✓
Experienced Mechanic
55,612 POSTS
Hello,
It sounds like you have a shift selector switch that is out. This switch sits on the side of the transmission (diagrams below)
There are several fuses the control the transmission Here are some guides to help you.
https://www.2carpros.com/articles/how-to-check-a-car-fuse
and to check the switch
https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester
Here is a guide to show you how to drop the pan and get the transmissions serviced.
https://www.2carpros.com/articles/how-to-service-an-automatic-transmission
Please run some tests and get back to us we are interested to see what it is.
Cheers, Ken
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Jul 29, 2017 at 5:03 AM
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