2001 Chevy blazer 2 wheel drive 4.3 V6 transmission shifts fine then it stops won't come out of first . I unplug battery for a bit then plug it back in and it runs fine for a bit ?
When I drive it after plugging battery up it runs fine till I turn it off restart and then it won't shift out of first ? Unplug battery repeat and then runs good till shut off restart won't shift out of first ?
Cars & Trucks
Answers & Comments
The first step would be to attach a dealer scan tool, and see what is being sent/commanded. If there is a full command set from the outside, a pressure test would be the next, to see if pressure is rising in the proper areas. No computer command from the outside, would mean checking the related input sensors, such as the lever position switch, throttle position sensor, MAP sensor, air flow meter and the power control module. This requires a digital lab scope and a data recorder.