Actuator for supply voltage (HSD2), low
â–¶ How to fix
Check the cable harness between gearbox and control unit, particularly the cable to pin 71 on the control unit. If no fault is found, contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The control unit has detected less than 6 V in three solenoids in the HSD2 circuit.
Possible cause
This fault code may be caused by a short circuit to earth on the cable to pin 71 on the control unit.