Allison WTEC II Fault Code: 69 PID: SPN: 21 FMI: ECU, F solenoid driver open
Main code 69 indicates the ECU has malfunctioned. ECU, open driver, C 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.
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