problem with fire truck having 4000 series transmission

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New member
Nov 16, 2012
Im posting this on behalf of my dad. I hope someone out here can help him pls.
He is having problem with a fire truck having 4000 series Allison transmission 4th gen. It shows "CAT EYE" on shift selector. If i install brake out box J-39700 the vehicle works okay and no DTC . If i remove brake out box J-39700 and connect the vehicle harness to TCM again there is CAT EYE display on shift selector. Shift selector sometimes displays CAT EYE and sometimes diaplays all segment.TCM is brand new
He hasnt been able to identify the problem..
Pls if anyone can help pls do reply
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