Oil temperature sensor, voltage low
Check that there is no damage or short circuit on the external cable harness. Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
The Allison fault code number is: P0712.The control unit uses default values for temperature.For the fault code to be set, the engine must be running and must have been hotter than 20ºC for 20 seconds if the engine has been running for less than 10 minutes.The fault code is cleared automatically, when the vehicle has completed 40 start-up cycles without the fault being detected again.
Diagnostic depth
The control unit has detected that the sump oil temperature has been higher than a calibrated value for more than 2.5 seconds.
A possible cause of the fault may be damage to the cable harness or a short circuit of pin 54 to ground.