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Summary
  • DTC P0572 stands for “Brake Switch ‘A’ Circuit Low.”
  • This code is logged when the brake switch’s circuit “A” shows signs of low voltage.
  • This may be set due to brake switch failure, a faulty PCM, or wiring issues.
  • Common symptoms to watch for include brake lights that won’t turn on and cruise control malfunction.

The brake switch is an input switch that alerts the powertrain control module (PCM) whenever the brake pedal is depressed. It also acts as a signal for activating your brake lights, deactivating cruise control, activating the anti-lock brakes, and brake shift interlock.

If the PCM is unable to receive a signal signifying that the brake pedal is depressed, it will log a P0572 code.

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What Does the P0572 Code Mean?

Diagnostic trouble code (DTC) P0572 stands for “Brake Switch ‘A’ Circuit Low.”

Most brake switches operate in the same circuit as the brake light and tail light and can sometimes develop electrical issues.

When on-board diagnostics (OBD) logs a P0572 code, it could mean that the brake switch’s circuit “A” is showing signs of a low voltage condition.

Note: The definition of code P0572 might be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.

car brake pedal pressed by brown shoe
The brake switch is an input switch that alerts the powertrain control module (PCM) whenever the brake pedal is depressed.

What are the Common Causes of the P0572 Code?

  • Brake switch failure
  • Faulty PCM
  • Wiring issues (e.g., pinched or chafed wiring)

What are the Common Symptoms of the P0572 Code?

How to Diagnose the P0572 Code

DTC P0572 is a generic powertrain code that can be logged in different vehicles. While this might be the case, keep in mind that the steps for diagnosis and repair can vary, depending on vehicle specifications. In fact, in some vehicles, a P0572 code might be translated as “Cruise Control/Brake Switch ‘A’ Circuit Low.”

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If you’re not familiar with the process of diagnosing trouble codes, it’s best to seek help from a professional to ensure that all steps and protocols are followed correctly. Otherwise, you can go ahead and do the job yourself.

To help you out, here are a couple of videos to give you an idea of what the process might involve:

How to Fix the P0572 Code

Attempting to fix a P0572 code can be tricky, especially if you’re not equipped with the right tools and technical knowledge. Fixing this type of DTC typically involves disconnecting the entire switch and using jumper wires as well as checking for an open or high resistance in the brake switch signal circuit.

If you’re not confident in your DIY skills yet, it might be best to leave the job to the pros. But if you think you can work your way around this issue on your own, make sure to have the right repair manual before proceeding.

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Repair manuals like those from Chilton or an ALLDATA subscription come with vehicle-specific repair information, so you might want to check those out before working on your daily driver.

About The Authors
Written By Automotive and Tech Writers

The CarParts.com Research Team is composed of experienced automotive and tech writers working with (ASE)-certified automobile technicians and automotive journalists to bring up-to-date, helpful information to car owners in the US. Guided by CarParts.com's thorough editorial process, our team strives to produce guides and resources DIYers and casual car owners can trust.

Reviewed By Contact Center Manager and Technical Reviewer at CarParts.com

William “Bill” Guzenski has produced hundreds of how-to videos for the automotive community. He’s an ASE Certified Master Automobile Technician, and is affiliated with the Specialty Equipment Market Association (SEMA). He loves attending race events and car shows throughout the country, as well as traveling in his 40-foot motorhome, exploring abandoned mines and ghost towns.

Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.

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