Control system performance
â–¶ How to fix
Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Reply signal from PS1 does not correspond to what the signal should show.
Possible cause
The following can be incorrect: Low gearbox oil levelC1 or C2 may be stuckGear shift solenoid SS1 may be faultyPS1 may be faulty or stuckShort circuit to earthWorn out or faulty oil pump