P0850 – Park/Neutral Switch Input Circuit

Description

The park/neutral switch input circuit is malfunctioning.

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Symptoms

  • No start
  • Incorrect gear display
  • Harsh shifting
  • Poor acceleration
  • Check engine light

Causes

  • Faulty neutral switch
  • Damaged wiring
  • Loose connector
  • Shifter issue
  • ECU issue

Diagnosis

  • Inspect wiring
  • Test neutral switch
  • Check connectors
  • Scan live data
  • Inspect shifter

Repair

  • Replace neutral switch
  • Repair wiring
  • Fix connectors
  • Adjust shifter
  • Update ECU

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