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Allison WTEC II Fault Code: 33 PID: SPN: 12 FMI: Sump oil temperature sensor, failed low

Main code 33 indicates the sump temperature sensor is providing a signal outside the usable range of the ECU. This code indicates the sensor failed showing abnormally low temperature readings.

Main code 33 Causes:

1. Component or circuit failure
2. Extremely high or low temperatures.

There are no operational inhibits related to main code 33. The ECU assumes a hardware failure and that transmission temperatures are normal (93oC; 200oF). Temperatures above or below normal cause poor shift quality.

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