P1800 GMC - ECM to TCM Engine Coolant Signal
- 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)
P1800 Gmc DescriptionWith the key on, the Powertrain Control Module (PCM) receives a signal that indicated that the power supply to Transmission Control Module (TCM) was interrupted.
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