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TransmissionSeverity Low: usually safe to drive

P0850Park/Neutral Switch Input Circuit

What it means

The ECU sees an implausible park/neutral switch signal.

Symptoms

  • Engine may not start, or starts in gear
  • Idle speed problems

Common causes

  • Misadjusted or faulty switch
  • Wiring fault

What to check first

  1. Watch the park/neutral signal in live data
  2. Adjust or replace the switch
  3. Check the wiring
Can I drive with P0850? Usually yes. P0850 rarely affects how the car drives, but it keeps the check engine light on and can fail an emissions test.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0850: questions and answers

What does P0850 mean?

P0850: Park/Neutral Switch Input Circuit. The ECU sees an implausible park/neutral switch signal.

What are the symptoms of P0850?

Engine may not start, or starts in gear. Idle speed problems.

What causes P0850?

Misadjusted or faulty switch. Wiring fault.

How do you diagnose P0850?

1. Watch the park/neutral signal in live data 2. Adjust or replace the switch 3. Check the wiring

Can I drive with P0850?

Usually yes. P0850 rarely affects how the car drives, but it keeps the check engine light on and can fail an emissions test.