Allison WTEC II Fault Code: 61 PID: SPN: 00 FMI: Retarder oil temperature sensor, failed low
Main code 61 indicates the ECU has detected a hot fluid condition in the output retarder.
Possible causes (but not all causes) for hot fluid are:
1. Prolonged retarder use.
2. Low fluid level.
3. High fluid level.
4. A retarder apply system that allows the throttle and retarder to be applied simultaneously.
5. Cooler inadequately sized for retarder.
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Allison Transmission – WTEC 2 MD/HD/B SERIES TRANSMISSIONS
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