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2005 LEXUS GS 430
4.3L V8•RWD•AUTOMATIC•gas
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Repairs0Labor479Torque3074Fluid8DTC1073Battery1Maintenance0Recalls0
P1520moderate severityPowertrain

Stop Lamp Switch Signal Malfunction

on 2005 Lexus GS 430 4.3L V8 · RWD

What this code means

The ECM detected a fault in the brake light switch signal circuit.

Symptoms

  • CEL
  • Cruise control inop
  • Brake lights stuck
  • Shift interlock issue

Common causes

  • Faulty stop lamp switch
  • Misadjusted switch
  • Damaged wiring
  • Poor connection

Diagnostic steps

  1. Test switch operation
  2. Adjust switch position
  3. Inspect wiring
  4. Check voltage

Repair notes

Replace or adjust stop lamp switch.

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