p0504 brake switch a b correlation 2

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P0504 Brake Switch A/B Correlation 2

  • P0504: This code indicates a malfunction in the brake switch circuit, specifically a correlation issue between the signals from Brake Switch A and Brake Switch B.

p0504 – Brake Switch “A” / “B” Correlation

Typical Severity: Moderate

Common Causes

p0504 – Brake Switch “A” / “B” Correlation

Common causes:

  • Faulty brake light switch
  • Misadjusted brake light switch
  • Open or short circuit in the brake light switch circuit
  • Corroded electrical connectors related to the brake light switch

 

Common Misdiagnosis

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OBD2 Code: P0504

Description: Brake Switch A/B Correlation

Common Misdiagnosis: Replacing the brake light bulbs or fuses instead of diagnosing the brake switch circuit.

OBD2 Code: Brake Switch A Circuit Malfunction

Description: Issues with the brake switch A circuit.

Common Misdiagnosis: Assuming a faulty brake pedal position sensor without checking the wiring and connections.

OBD2 Code: Brake Switch B Circuit Malfunction

Description: Issues with the brake switch B circuit.

Common Misdiagnosis: Replacing the ABS module when the problem lies in a simple wiring issue or connector fault.

OBD2 Code: Brake Light Switch Stuck Off

Description: The brake light switch is not activating as it should.

Common Misdiagnosis: Changing out perfectly functional bulbs, thinking they are burnt out due to non-illumination.

OBD2 Code:P0504 – Brake Switch “A” / “B” Correlation Fault

(Note: This is similar to P0504 but may appear differently in some systems)

Description: The signals from both switches do not match as expected during operation.











.:::::::::. (Note: This is similar to P0504 but may appear differently in some systems). (Note: This is similar to P0504 but may appear differently in some systems). (Note: This is similar to P0504 but may appear differently in some systems). (Note: This is similar to P0504 but may appear differently in some systems). (Note: This is similar to P0504 but may appear differently in some systems).OBD2 Code: P0504 – Brake Switch A/B Correlation

Description: This code indicates a malfunction in the correlation between the signals from brake switch A and brake switch B.

  • Check for any stored codes related to the ABS or traction control system, as these may be related to the issue.
  • Inspect the brake light switch for proper operation. Ensure it is not stuck or damaged.
  • Verify that both brake switches (A and B) are properly connected and functioning correctly. Use a multimeter to check for continuity when the pedal is pressed.
  • Examine wiring and connectors associated with the brake switches for signs of damage, corrosion, or disconnection.
  • If equipped, use a scan tool to monitor live data from both brake switches while pressing and releasing the pedal. Check if their signals correlate correctly.
  • Test the vehicle’s battery voltage and charging system to ensure they are within specifications, as low voltage can affect sensor performance.
  • If all checks pass but the code persists, consider replacing one or both of the brake switches after consulting vehicle-specific repair information.

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