Control module for RAM memory
â–¶ How to fix
Renew the control unit.Contact an Allison dealer.
What you'll see
No driver-visible symptom recorded.
System reaction
Yellow warning lamp comes on.The fault code is stored in the memory.The control unit returns to the boot software.The control unit prevents a gear being engaged.
Diagnostic depth
Detection
The control unit has detected that the memory pattern written to the control unit during the test is not the same as the memory pattern from the TCM.
Possible cause
Possible cause:The self test of the memory area failed during TCM start-up.