P0571 MERCEDES-BENZ code

P0571 is a generic OBD-II diagnostic trouble code (DTC) that the engine control module (ECM) generates. The P0571 code is defined as a “cruise control / brake switch ‘ A’ circuit malfunction.” The letter ‘A’ can refer to a specific wiring, harness, connector, and so on.

How do I fix code P0571?

What repairs can fix the P0571 code?

  1. Electrical components and connections will be inspected for signs of damage or wear.
  2. Any wires or connections that do not appear to be in good working order will be repaired or replaced.
  3. Once the wiring is all in good shape, the mechanic will inspect the brake pedal and brake switch.

What does brake switch a circuit mean?

Diagnostic trouble code (DTC) P0571 stands for “Brake Switch A Circuit.” It is logged when the powertrain control module (PCM) detects an issue with the brake switch or its circuit. The brake switch is crucial to the operation of your vehicle’s cruise control system.

How do you test a cruise control brake switch?

Since the brake pedal and cruise control share the same activation switch, one way to determine if the switch is faulty is to press the brake pedal and see if the brake lights illuminate. If they do not, the cruise control brake switch may need to be replaced.

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What code is P0573?

The P0573 code is defined as “Cruise Control / Brake Switch A Circuit High” and indicates a high voltage signal malfunction in the cruise control brake switch (stop light switch). The letter designation “A” can point to a particular component like a wiring harness, connector and so on.

How do you test a brake pedal position sensor?

The best way to test a brake pedal position sensor is by using a multimeter that could get the voltage running through the sensor. Simply put the multimeter on the wires and then press the pedal down while the car is turned on. If the multimeter cannot pick up a voltage, the sensor is faulty or damaged.

What does P0572 mean?

The P0572 code means that your ECM has detected a low voltage from the brake switch circuit. When this happens, the ECM will likely disable your cruise control.

What does brake switch a circuit low mean?

OBD-II Code Cruise control will not operate is defined as a Brake Switch “A” Circuit Low. The Brake Switch tells the engine control module (PCM) that the brake pedal is depressed. This switch also controls the brake lights.

Is there a fuse for cruise control?

All electrical systems in the vehicle are controlled by fuses. Your cruise control system is attached to a fuse that can blow if there is a short circuit or fault. Without a good fuse, the cruise control system can’t work at all. Thankfully, it’s not difficult to find and replace a blown fuse.

Where is the cruise control brake switch located?

The cruise control is supposed to shut off if the brake lights go on—a bad switch won’t make that happen. Luckily, this is a very easy, stress free repair. The switch is located right near the tip of your right foot near the brake pedal, so it’s easy to access.

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How do I reset my cruise control?

For a quick reset, accelerate with the accelerator pedal to the desired speed, then press and release the “SET/COAST” button. Press and hold the “SET/COAST” button to decelerate. Release the button when you reach the desired speed; the cruise control system will be set to that speed.

How much does it cost to fix a brake light switch?

How Much Does it Cost to Replace the Brake Light Switch? A replacement brake light switch generally costs around $30 to $75, depending on the make and model of the vehicle. Getting a brake light switch fixed at a shop will add typically $80 to the repair.

How do I know if my brake switch is bad?

What Are The Symptoms Of A Faulty Brake Light Switch?

  1. Your Brake Lights Don’t Light Up. Your brake lights are supposed to turn on when you push down on the brake pedal, giving a heads up to the driver behind you. …
  2. Brake Lights Stay On Continuously. …
  3. Bad Cruise Control. …
  4. Car Won’t Turn On. …
  5. ABS Warning Light Comes On.


How do you reset a brake light switch?


Zitat von Youtube: So when you install that you have to reset it by pulling the arm all the way out like this then what you do is push the brake pedal down as if breaking.