Retarder pressure sensor, voltage low
â–¶ How to fix
Check the cable harness between gearbox and control unit, particularly the cables connected to pins 12 and 44 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 0 V, i.e. too low a voltage from the retarder pressure sensor.
Possible cause
Possible cause of this fault code is a short circuit to earth or an open circuit in one of the cables to pin 12 or 44 on the control unit.