Main code 69 indicates the ECU has malfunctioned. ECU, open driver, A solenoid circuit
To assist in tracking ECU reliability, the subcode has been included to indicate the cause of the ECU malfunction. Most codes, except Code 69 34, can be cleared; but they will probably recur. Replacing the ECU corrects the problem.
Allison WTEC II Fault Code: 66 PID: SPN: 00 FMI: Serial communications interface fault
Allison WTEC II Fault Code: 65 PID: SPN: 00 FMI: Engine rating too high
Allison WTEC II Fault Code: 64 PID: SPN: 23 FMI: Retarder modulation request sensor, failed high
Allison WTEC II Fault Code: 64 PID: SPN: 12 FMI: Retarder modulation request sensor, failed low
Allison WTEC II Fault Code: 63 PID: SPN: 41 FMI: Pump/pack and a neutral general purpose input
Allison WTEC II Fault Code: 63 PID: SPN: 40 FMI: Service brake status input failed on
