P0851 – Park/Neutral Switch Input Low

Description

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

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Symptoms

  • No start
  • Wrong gear display
  • Harsh shifting

Causes

  • Short to ground
  • Faulty switch
  • Wiring issues

Diagnosis

  • Monitor switch data
  • Inspect wiring
  • Check alignment

Repair

  • Replace switch
  • Repair wiring

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