Possible causes

– Faulty Park/Neutral Switch
– Park/Neutral Switch harness is open or shorted
– Park/Neutral Switch circuit poor electrical connection

When is the code detected?

The signal of the park/neutral position (PNP) switch is not changed in the process of engine starting and driving.

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0850 Description

When the shift position is P or N, park/neutral position (PNP) switch is turned ON. The Engine Control Module (ECM) detects the position because the continuity of the line (the ON signal) exists.
The park/neutral position (PNP) switch assembly also indicates a transmission range switch to detect shift lever position.

P0850 Information for specific makes

P0850 DODGE
P0850 NISSAN
P0850 INFINITI