P1DDE FIAT - Ignition Run-Start Input 1-2 Correlation
- Faulty Transmission Control Module (TCM)
- Transmission Control Module (TCM) harness is open or shorted
- Transmission Control Module (TCM) circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1dde Fiat DescriptionThe purpose of the diagnostic is to monitor if the hard-wired ignition signal state is equal to the ignition signal state received on the Controller Area Network (CAN) BUS. The CAN message is sent by the Body Control Module (BCM) to the Transmission Control Module (TCM).
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