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P1780 Diagnostic Trouble Code Discussion for May 2004

Park/Neutral Position Switch Circuit Malfunction

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Trouble Ticket Help Requests for DTC P1780
Help Request Posted
1997 Ford Contour GL 2.0L MIL Lamp on VIN: 1FALP6538V
P1780: trans control switch out of range. ... problem. Both p0402 and p1780 present. Have tested vacuum solenoid(appears good). Removed vacuum hose from egr valve and installed gauge to hose. When rpm is raised, sufficient vacuum is present. When vacuum is applied to valve at idle vehicle stumbles and...
May 26, 2004