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To exit the diagnostic code function:
Any of the following methods may be used.
1. For a pushbutton shift selector, press the N (NEUTRAL)
range button.
2. For a bump lever shift selector, press the DIAGNOSTICS
range button until back to range display.
3. Wait approximately 10 minutes and the system will
automatically return to normal operating mode.
4. Turn off the vehicle engine ignition switch.
Drive the vehicle and check for code recurrence. If codes continue to
recur, bring the vehicle to an Allison Authorized Service Network to
diagnose and repair the problem causing the codes.