Code Definition

P0571 — Cruise Control/Brake Switch A Circuit Malfunction

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0571

P0571 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0571 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0571 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The P0571 fault code is set when the Engine Control Module (ECM) detects a malfunction in the circuit of the brake switch, specifically related to its interaction with the cruise control system. The brake switch, which is activated when the brake pedal is pressed, plays a crucial role in deactivating the cruise control system. It ensures that the cruise control is disengaged for safety reasons whenever the brakes are applied. A malfunction in this switch or its circuit can lead to issues such as the cruise control not disengaging when the brakes are applied, which poses a significant safety ri...

Join TaT to view the complete code information and diagnostic details.

Quick Facts