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This thread may also yield some direction..read Ronmars post
https://www.steelsoldiers.com/threads/m1078-lbcd-and-transmission-shifting-problems.218490/
https://thecampingadvisor.com/allison-transmission-fault-code-list/
I've used this for trans codes. There may be another more specific list for lmtv but this is Allison's. 4212 is solenoid shorted to battery, seems like wiring issue.
I have/had the same trans shift to 5 problem. Same...
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