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P0504 Lexus Code - Brake Switch Circuit 'A' / 'B' Correlation

- Code Popularity: 24,415 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 1/3
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What are the Possible Causes of the DTC P0504 Lexus?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty Stop Lamp Switch (Brake Switch)
  • Blown Stop Lamp Bulb
  • Stop Lamp Switch harness open or shorted
  • Stop Lamp Switch circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
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How to Fix the DTC P0504 Lexus?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0504 Lexus code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0504 Lexus Description

The Stop Lamp Switch is a duplex system that transmits two signals: STP and ST1-. These two signals are used by the Engine Control Module (ECM) to monitor whether or not the brake system is working properly. If the signals, which indicate the brake pedal is being depressed and released, are detected simultaneously, the ECM interprets this as a malfunction in the stoplight switch and sets the Diagnostic Trouble Code (DTC).

OBDII Code P0504 Lexus - Brake Switch Circuit 'A' / 'B' Correlation - AutoCodes.com
P0504 Lexus Code - Brake Switch Circuit 'A' / 'B' Correlation

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