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I have a 2008 Sterling Bullet 6.7 cummins with the aisan transmission with 210k miles. The dealer has been no help since they have discontinued all software programming for the truck.

The problem I am having is the gear indicator light on the cluster are lighting up with squares around them. When it does that the transmission drop out of OD to D and not shift from there. We have replaced the TIPM and the TCM and I was able to get programmed by a guy who was able to build a custom program for it.

Truck did good for 400 miles and I thaught we had found the problem but its back to doing the same thing. I am thinking it has to be a wiring issue, maybe a touching wire somewhere in the harness but have no idea where to begin.

Any tips I am all ears and eyes!
 
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