- Immediate Shutdown (ISDN) Circuit
- Faulty Transmission Control Module (TCM)
- Faulty Trailer Brake Control Module (TBCM)
- Engine Light ON (or Service Engine Soon Warning Light)
P1a0a Ford DescriptionThe Transmission Control Module (TCM) monitors 2 redundant Immediate Shutdown (ISDN) inputs from the Trailer Brake Control Module (TBCM). When the Transmission Control Module (TCM) detects one or both inputs out of the expected range this code is set.
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