P0571 — Brake Switch A Circuit

P0571: Brake Switch A Circuit — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Brake Switch A Circuit. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • Brake lamps inoperative or continuously lit; cruise control unavailable.

Possible causes

  • Faulty/misadjusted switch, damaged wiring or blown fuse.

What to check

  • Check fuse, circuit and brake-switch adjustment against service information.

Also written as: P0571-00, P057100, PO571 (some scan tools add the fault-type byte, e.g. -00).