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P0724 OBD2: Brake Switch "B" Circuit High

P0724 OBD2: Brake Switch “B” Circuit High

What Does the P0724 Code Mean?

OBD-II Code P0724 is defined as a Brake Switch “B” Circuit High. This code indicates that the engine control module (PCM) has detected an implausible signal from the brake switch, which is responsible for informing the PCM when the brake pedal is depressed. This switch also controls the vehicle’s brake lights.

What Causes the P0724 Code?

The P0724 code can be triggered by several factors, including:

  • Brake switch failure
  • Body Control Module (BCM) failure
  • Wiring issues within the brake switch circuit

What Are the Symptoms of the P0724 Code?

Common symptoms associated with the P0724 code include:

  • Brake lights may not illuminate
  • Cruise control will not operate

How Serious Is the P0724 Code?

The P0724 code is classified as urgent, indicating that immediate action is necessary. Ignoring this issue can lead to significant malfunctions that may cause severe damage to the vehicle or pose a safety risk to the driver and passengers.

How to Diagnose the P0724 Code

Diagnosing the P0724 code involves a systematic approach:

  1. Check for any additional OBD-II codes that may provide further context.
  2. Inspect the brake switch and wiring for any visible damage or corrosion.
  3. Test the brake switch functionality using a multimeter.
  4. Examine the Body Control Module (BCM) for any faults.

Common Repairs for the P0724 Code

Repairs for the P0724 code may include:

  • Replacing the faulty brake switch
  • Repairing or replacing damaged wiring
  • Replacing the Body Control Module (BCM) if determined to be faulty

How Much Does It Cost to Fix the P0724 Code?

The cost to fix the P0724 code can vary widely depending on the specific repair needed. On average, you might expect to pay between $100 and $300 for parts and labor, depending on whether it’s a simple switch replacement or a more complex BCM repair.

Can I Fix the P0724 Code Myself?

While some DIY mechanics may be able to diagnose and replace the brake switch themselves, it is essential to have a clear understanding of the vehicle’s electrical system. If you are not confident in your skills, it’s advisable to seek professional assistance to avoid causing further issues.

About JC Landry

JC spent 15+ years as a certified Master Mechanic before trading the shop for the keyboard. He's worked across dealerships, owned and operated his own independent garage, and consulted on automotive trade school curricula, reviewing technical textbooks used in vocational programs. He now serves as Editor-in-Chief at eManualOnline.com, where he oversees the platform's technical content. He's one of the few voices in automotive publishing who has actually turned wrenches professionally on the vehicles he covers. He didn't learn automotive repair to write about it. He learned to write after spending over a decade doing it.

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