P1780 GMC - Park Neutral Position Switch Circuit
- Faulty Park Neutral Position Switch
- Park Neutral Position Switch harness is open or shorted
- Park Neutral Position Switch circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P1780 Gmc DescriptionWith the engine running with an engine speed change from below 300 rpm to over 500 with the VSS input at 0 mph and the Park Neutral Position (PNP) switch signal open (R, D, 2 or L gear positions), or a PNP switch closed (P/N position) input was detected for 10 seconds with the engine is running at over 2500 RPM and over a 38 5% calculated load value.
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