Appendix C – Allison Diagnostic Troubleshooting Codes
190
The Diagnostic Display Mode can be exited by any of the following methods:
o Press simultaneously the
(Up) and (Down) arrow buttons at the same time on the pushbutton
shift selector.
o Press any range button «D», «N» or «R» on the pushbutton shift selector (the shift will be commanded
if it is not inhibited by an active code).
o Wait until the calibrated time (approximately 10 minutes) has passed. The system will automatically
return to the normal operating mode.
o Turn off power to the TCM (shut off the engine using the ignition key).
NOTE
If clearing a code while locked in a «D» (Drive) or «R» (Reverse) position (fail-to-range), the
transmission will still be in «D» (Drive) or «R» (Reverse) when the clearing procedure is completed.
«N» (Neutral) must be manually selected.
DIAGNOSTIC CODE RESPONSE
The following responses are used in the "Diagnostic Troubleshooting Code List and Inhibited Operation
Description" table to command safe operation when diagnostic codes are sent.
DNS - Do Not Shift
Response
Release lock up clutch and inhibit lock up operation.
Inhibit all shifts.
Turn ON the CHECK TRANS light.
Display the range attained.
Ignore any range selection inputs from the shift selector.
DNA - Do Not Adapt
Response
The TCM stops adaptive shift control while the code is active.
SOL OFF - SOLenoid OFF
Response
All solenoids are commanded OFF (turning solenoids “A” and “B” off electrically cause them to be on
hydraulically).
RPR - Return to Previous Range Response
When the speed sensor ratio or C3 pressure switch test associated with a shift not successful, the TCM
commands the same range as commanded before the shift.
NNC - Neutral No Clutches Response
When certain speed sensor ratio or C3 pressure switch tests are not successful, the TCM commands a
neutral condition with no clutches applied.
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