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2006 LEXUS GS 430
4.3L V8•RWD•AUTOMATIC•gas
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Repairs0Labor478Torque2122Fluid8DTC1846Battery1Maintenance0Recalls0
P0498moderate severityPowertrain

Evaporative Emission System Vent Valve Control Circuit Low

on 2006 Lexus GS 430 4.3L V8 · RWD

What this code means

The PCM detects low voltage in the EVAP vent valve control circuit. This can prevent the vent valve from operating correctly during leak tests.

Symptoms

  • Check engine light on
  • Failed EVAP monitor
  • No noticeable driving symptoms

Common causes

  • Short to ground in vent valve wiring
  • Faulty vent valve solenoid
  • Corroded connector at vent valve
  • Faulty PCM driver circuit

Diagnostic steps

  1. Scan and record freeze frame data
  2. Inspect vent valve wiring and connector
  3. Measure vent valve circuit voltage
  4. Test vent valve solenoid resistance
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