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2006 LEXUS GS 430
4.3L V8•RWD•AUTOMATIC•gas
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Repairs0Labor478Torque2122Fluid8DTC1846Battery1Maintenance0Recalls0
P0861high severityPowertrain

Gear Shift Module Communication Circuit Low

on 2006 Lexus GS 430 4.3L V8 · RWD

What this code means

The signal voltage on the gear shift module communication circuit is lower than expected. This often points to a short to ground or an open in the wiring.

Symptoms

  • Erratic or no gear position indication
  • Shifting problems or no shift
  • Transmission warning light

Common causes

  • Short to ground in communication wiring
  • Damaged connector or corroded pins
  • Faulty gear shift module
  • Failed transmission control module

Diagnostic steps

  1. Retrieve all stored codes
  2. Inspect wiring for shorts to ground
  3. Measure circuit voltage and compare to spec
  4. Repair wiring or replace gear shift module as needed
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