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P0572 OBD-II Trouble Code: Cruise Control/Brake Switch A Circuit Low

check engine light

P0572 code definition

The P0572 code indicates that there has been a malfunction within the cruise control system or brake switch, and the car’s computer has detected lower than usual voltage.

What the P0572 code means

The P0572 code means that the car’s computer has detected lower than normal voltage from the brake switch circuit. The brake switch is used for multiple purposes within the vehicle, including operating the shift interlock, turning the brake lights on when the pedal is pressed and deactivating cruise control while driving. If the computer determines that the brake switch circuit voltage is low, it will disable cruise control and usually set the P0572 code. The Check Engine light may come on as well.

What causes the P0572 code?

There are several possible causes of the P0572 code, including the following:

  • Damage to the cruise control switch (spilled liquids, for instance)
  • A faulty cruise control switch
  • A faulty brake light switch
  • A poorly adjusted brake light switch (sometimes common after replacement)
  • An open or short in the cruise control switch circuit or in the brake switch circuit

What are the symptoms of the P0572 code?

The P0572 code can present with a number of potential symptoms, including the following:

How does a mechanic diagnose the P0572 code?

A mechanic should first connect a handheld scanner to the OBD II connector under the car’s dash in order to read the codes stored in the system. The car should be test driven to see if the code will return. Next, the mechanic should inspect the brake light switch, which is mounted above the brake pedal.

The switch’s adjustment should be checked, as well as its operability (resistance/voltage testing). If the switch passes the test, the mechanic should then test the cruise control switch, as well as inspecting the cruise switch for signs of liquid spills. A check for blown fuses is also necessary, both before beginning repairs and after completing all repairs.

In some instances, the problem may actually lie with the cruise control module, rather than the switch or the brake light switch. In this instance, the module will need to be replaced after being tested with a scanner while the car is in operation.

Common mistakes when diagnosing the P0572 code

One common mistake made when diagnosing the P0572 code is to assume that the issue is with the brake light switch itself and replacing the switch without further diagnosis. While the brake light switch is often the problem, a full diagnosis is needed to rule out other potential causes, including simple issues like blown fuses or liquid spills on the cruise control switch.

How serious is the P0572 code?

The seriousness of the P0572 code hinges on the cause. If the issue is the cruise control switch malfunctioning, then the situation is not serious, and the only symptom you will likely notice is the cruise control system not operating. However, if the problem is the brake light switch, this can become a very serious situation. The only way to know for certain is to have the car diagnosed by a professional mechanic.

What repairs can fix the P0572 code?

The most common repair for the P0572 code is replacing a failed brake light switch. However, other repairs that may be necessary include:

Additional comments for consideration regarding the P0572 code

The P0572 code may be something that doesn’t affect drivability much, or it could be the first sign of a more serious issue. It is important to have it diagnosed as quickly as possible.

Need help with a P0572 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
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