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Pinpoint Test C : DTC (Diagnostic Trouble Code) P1780: Notes

Refer to Transmission Controls - 6R80 for schematic and connector information.

Normal Operation 

The transmission control switch is a momentary contact switch located on the selector lever. When the switch is pressed the contacts close sending a voltage signal to the PCM (3.5L, 3.7L engine) or TCM (3.2L diesel). The transmission control switch is hardwired to the PCM/ TCM and notifies the module to disable the overdrive gear. The PCM/ TCM sends a message over the MS-CAN to the IPC which illuminates the tow haul indicator light in the IPC. When the switch is depressed again the PCM/ TCM enables the overdrive gear in the transmission and sends a message to the IPC extinguishing the tow haul light.

DTC Fault Trigger Conditions 

DTC Description Fault Trigger Conditions
P1780 Transmission Control Switch (O/D Cancel) Circuit Out of Self-Test Range
NOTE: For vehicles not equipped with a tow haul switch, disregard this DTC.
This DTC sets when the PCM / TCM does not see a change on the transmission control switch circuit during the KOER on-demand self-test.

Possible Sources 

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