Possible causes – Faulty Park/Neutral Position (PNP) switch– Park/Neutral Position (PNP) switch harness is open or shorted– Park/Neutral Position (PNP) switch circuit poor electrical connection– Misadjusted Park/Neutral Position (PNP) switch Symptoms – Engine Light ON (or Service Engine Soon Warning
Possible causes – Faulty Park/Neutral Position (PNP) switch– Park/Neutral Position (PNP) switch harness is open or shorted– Park/Neutral Position (PNP) switch circuit poor electrical connection– Misadjusted Park/Neutral Position (PNP) switch Symptoms – Engine Light ON (or Service Engine Soon Warning
Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1780 Information for specific makes P1780 BUICKP1780 CADILLACP1780 FORDP1780 HYUNDAIP1780 HYUNDAIP1780 LEXUSP1780 TOYOTA
CADILLAC Technical Service Bulletins for P1780 code 2003 CADILLAC CTS ELECTRICAL SYSTEM
P1780 FORD – Transmission Control Switch Circuit is Out of Self-Test Range
P1780 HYUNDAI – Torque Reduction Required Signal
P1780 HYUNDAI – Torque Reduction Required Signal
P1780 BUICK – Park/Neutral Postion (PNP) Switch Circuit Engine Torque Signal Circuit