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2006 LEXUS GS 430
4.3L V8•RWD•AUTOMATIC•gas
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Repairs0Labor478Torque2122Fluid8DTC1846Battery1Maintenance0Recalls0
P0596low severityPowertrain

Cruise Control Servo Control Circuit High

on 2006 Lexus GS 430 4.3L V8 · RWD

What this code means

The cruise control servo control circuit voltage is higher than expected. This often indicates an open circuit or short to voltage in the servo control line.

Symptoms

  • Cruise control inoperative
  • Speed not held when set
  • Dash warning light illuminated

Common causes

  • Short to voltage in servo circuit
  • Open in servo control wiring
  • Faulty cruise control servo
  • PCM driver circuit failure

Diagnostic steps

  1. Retrieve related trouble codes
  2. Check servo circuit for short to power
  3. Test circuit continuity to PCM
  4. Verify servo command voltage with scanner
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