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P1780 Diagnostic Trouble Code Discussion for July 2005

Park/Neutral Position Switch Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1780
Help Request Posted
2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R7Y
P1780: Torque Reduction Request Failed. Both P1779/P1780 appear to deal with comm. between ECM and TCM on the CAN network. Cannot find problem with PNP sw. inputs to either ECM or TCM. Have perfect continuity between ECM and TCM on tan and tan w/black wires(CAN network) No TCM codes, clear ECM code ...
July 13, 2005