Fault on torque limiter between engine and gearbox
â–¶ How to fix
Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
The Allison fault code number is: P0614.The control unit only permits reverse gear and 2nd gear.The fault code is cleared automatically, when the vehicle has completed 40 start-up cycles without the fault being detected again.
Diagnostic depth
Detection
Engine does not respond to gearbox request for torque reduction.
Possible cause
Engine does not support this function.