P1780 MERCURY - Transmission Control Switch Circuit is Out of Self-Test Range
- Transmission Control Switch (TCS) not cycled during the self-test
- Faulty Transmission Control Switch
- Transmission Control Switch harness is open or shorted
- Transmission Control Switch circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1780 Mercury DescriptionDuring Key ON Engine Running (KOER) self-test the Transmission Control Switch (TCS) must be cycled, or the P1780 code is set.
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