P1780 Buick Code - Park Neutral Position Switch Circuit

Quick Answer

With 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. Common causes include Faulty Park Neutral Position Switch, Park Neutral Position Switch harness is open or shorted, Park Neutral Position Switch circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means

P1780 Buick indicates Park Neutral Position Switch Circuit.

Common causes

Common causes include Faulty Park Neutral Position Switch, Park Neutral Position Switch harness is open or shorted, Park Neutral Position Switch circuit poor electrical connection.

Severity

High - diagnose this code as soon as possible.

Can I drive?

Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.