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2007 LEXUS GS 430
4.3L V8•RWD•AUTOMATIC•gas
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Repairs0Labor478Torque2122Fluid8DTC1857Battery1Maintenance0Recalls0
P1601high severityPowertrain

ECM/PCM Communication Malfunction

on 2007 Lexus GS 430 4.3L V8 · RWD

What this code means

The ECM has detected a communication fault with another control module. This can disrupt vehicle system coordination.

Symptoms

  • Multiple warning lights
  • Poor drivability
  • Communication error codes

Common causes

  • Damaged CAN bus wiring
  • Faulty control module
  • Poor ground or power connection
  • Corroded connectors

Diagnostic steps

  1. Scan all modules for codes
  2. Check CAN bus wiring integrity
  3. Verify module power and grounds
  4. Repair wiring or replace module
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