P0571 Code - Cruise Control/Brake Switch 'A' Circuit Malfunction

What Does P0571 Mean?

OBD-II Code P0571 is defined as a Brake Switch "A" Circuit

The Brake Switch tells the engine control module (PCM) that the brake pedal is depressed. This switch also controls the brake lights. If the PCM detects the vehicle is slowing down without the brake light switch telling the PCM the pedal is depressed, the PCM will set code P0571.

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What are the common causes of P0571 ?

The brake switch code may have several causes:

• Issue within the circuitry of the brake switch
• Faulty brake switch
• Damaged components in cruise control system
• Faulty switch in cruise control button(s)

How do you troubleshoot P0571 ?

Check to make sure they are not burnt or corroded. If in doubt, get some Electrical Contact cleaner at any parts store if cleaning of the terminals is needed. Look for missing ground strap or a rusty ground where the fuel tank is grounded to the frame. Check for damage to the wiring harness connector.

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