Transmission oil
â–¶ How to fix
Check whether the vehicle has been driven extremely hard without lock-up when this fault code is generated. Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
Gearbox oil temperature is too high.
Possible cause
Long and/or heavy driving without lock-up or long periods of retarder braking can cause this fault code. The fault code is set when the oil has been hotter than 126 °C for at least 10 seconds. The fault can also be caused by a valve jamming.