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Pinpoint Test E : DTC P1780 (TCS): Notes

Diagnostic Overview 

Normal Operation and Fault Conditions 

The TCS is a momentary contact switch located on the selector lever. Pressing the TCS will engage or disengage the O/D function of the transmission. When the O/D is disengaged, the O/D icon will illuminate OFF on the IPC. Each time the ignition switch is cycled, the transmission will automatically provide O/D operation regardless of TCS position the last time the engine was running.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
P1780 TCS Circuit Failure The TCS failed during the self-test.

Possible Sources 

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