P0852 – Park/Neutral Switch Input High

Description

The ECM detects a high voltage condition in the park/neutral switch circuit.

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Symptoms

  • Harsh shifting
  • Wrong gear display
  • No start

Causes

  • Open circuit
  • Faulty switch
  • Wiring issues

Diagnosis

  • Monitor switch voltage
  • Inspect wiring
  • Check alignment

Repair

  • Replace switch
  • Repair wiring

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