P0854 – Drive Switch Input Low

Description

The ECM detects a low voltage condition in the drive switch circuit.

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Symptoms

  • Harsh shifting
  • No shift
  • Limp mode

Causes

  • Short to ground
  • Faulty switch
  • Wiring issues

Diagnosis

  • Monitor switch voltage
  • Inspect wiring
  • Check grounds

Repair

  • Replace switch
  • Repair wiring

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