Error code

OBD2 P0850

OBD2P0850
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Park/Neutral Switch Input Circuit.

Severity

moderateCan drive, but may experience issues with engine starting and cruise control.

Summary

P0850 indicates an issue with the Park/Neutral Position (PNP) switch input circuit, which is used by the ECM and TCM to determine shift patterns and control engine starting and cruise control.

Symptoms

  • Engine starting may be locked out
  • Cruise control may be disabled

Common Causes

  • Corrosion or water entry causing internal damage to the PNP switch
  • Misalignment of the PNP or PRNDL switch
  • Improper installation of an aftermarket remote starter affecting the PNP circuit

Diagnosis

  1. Check continuity in different shift positions using a DVOM or test light
  2. Verify input and output voltage to the PNP switch
  3. Inspect wiring harnesses for damage and check connectors for corrosion

Fixes

  • Replace faulty PNP switch if necessary

FAQ

Can I drive with this code?

Yes, but you may experience issues starting the engine and using cruise control.

What should I check first?

Start by checking continuity in different shift positions to determine if the PNP switch is functioning correctly.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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