Allison WTEC II Fault Code: 24 PID: SPN: 23 FMI: Sump fluid temperature, hot
Main code 24 indicates the ECU has detected either a high or low fluid temperature in the transmission sump (via the sump temperature sensor in the internal harness). No upshifts are allowed above a calibration range when Code 24 23 is set. A related code is 33 12 which indicates a temperature reading outside the usable range of the sensor and indicates a probable sensor failure.
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