My first post on Duramax Diesels:hello:. I've been reading almost all day on other posts and suggestions on how to diagnose the shift inhibited issue. I've learned a lot today and thanks to everyone who help others on this forum. I have narrowed my plan of action down to a couple things and I would appreciate it if someone would agree or direct me on a different path. I got the shift inhibited warning and the service engine light on my truck yesterday morning. I got the normal slipping etc. I put the shifter in drive and drove down the road and the transmission would not shift out of 1st gear. I pulled over at the first safe place to do so. I shut the engine off, waited about a minute, restarted the engine and drove off. The transmission shifted like a new truck and it did so all the way home, approx 125 miles with multiple stop/start at stop signs and lights. It drove like a new truck. So, here we go.
1) Does the perfectly shifting transmission indicate nothing wrong internally?
2) Should I lean toward taking the most widely suggested advice and replace the NSBU switch then the ignition switch?
3) Say heck with it and take it in to the dealer?
I used my AutoCal and pulled these codes: P0700,0846,0871,0875
I would appreciate any advice:thumb:.
1) Does the perfectly shifting transmission indicate nothing wrong internally?
2) Should I lean toward taking the most widely suggested advice and replace the NSBU switch then the ignition switch?
3) Say heck with it and take it in to the dealer?
I used my AutoCal and pulled these codes: P0700,0846,0871,0875
I would appreciate any advice:thumb:.
. It has 120,000 miles and it does see a lot of garage time too. I have a company car so the truck is more of a garage ornament than anything else. Did I mention that before yesterday, the truck sat in the garage without starting it for two months? I wonder if that could have caused this.... Hmmm.
