Modified trans tune, range shift inihibited reverse

ZachM54

New member
Mar 7, 2017
13
2
3
Kalispell, MT
I've been chasing this majority of summer. Running Mark's trans tuning to up the shift points and after driving a while and go to reverse it'll just show range shift inhibited. No codes on insight and no check engine lights. There is a P0742 code on the auocal tho. Clear code and then it'll go in reverse. From my understanding it's saying torque converter isn't unlocking which it def does. Could it maybe just be a lil delayed and throwing code from a dirty solenoid or something? Stock tune very rarely will act up, it just shifts way too early. Had some nsbu switch issues last fall and this spring. Was using napa switches. Put an allison one in yesterday and still doing it. Other than the reverse issue truck shifts great

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