P1780 – Transmission Control Switch Out of Self-Test Range

P1780 Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1780 Possible Causes

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

P1780 Description

During Key ON Engine Running (KOER) self-test the Transmission Control Switch (TCS) must be cycled, or the P1780 code is set.