P0571

Q: What does OBD2 code P0571 mean?

P0571 means: Cruise Control/Brake Switch A Circuit. Fault in the brake switch circuit that deactivates cruise control. The brake signal is used to disengage cruise when brakes are applied.

Cruise Control/Brake Switch A Circuit

Fault in the brake switch circuit that deactivates cruise control. The brake signal is used to disengage cruise when brakes are applied.

SeverityMinor

CategoryElectrical

Est. Repair Cost$20–$150

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Failed brake light switch
›Misadjusted brake switch
›Open circuit in brake switch wiring
›Failed cruise control module

⚠️ Symptoms

›Cruise control does not disengage when braking
›Cruise control inoperative
›Brake lights may not work
›Check engine light

✅ How to Fix — Step by Step

Step 1:Inspect brake light switch adjustment and operation
Step 2:Test brake switch with multimeter
Step 3:Replace brake switch
Step 4:Check wiring from switch to cruise control and ECU

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Test Light
✔Wiring Diagram
✔Basic Hand Tools

Using the correct diagnostic tools helps identify the root cause of P0571 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: A bad brake switch that prevents cruise disengagement is a safety hazard — it must be repaired immediately.

Repair Cost Estimate

Full Repair Estimate

$20–$150

DIY Possible?

YES

Severity

Minor

Frequently Asked Questions

What does OBD2 code P0571 mean?+

P0571 stands for Cruise Control/Brake Switch A Circuit. Fault in the brake switch circuit that deactivates cruise control. The brake signal is used to disengage cruise when brakes are applied.

What causes code P0571?+

Failed brake light switch; Misadjusted brake switch; Open circuit in brake switch wiring; Failed cruise control module

How do I fix code P0571?+

Inspect brake light switch adjustment and operation; Test brake switch with multimeter; Replace brake switch; Check wiring from switch to cruise control and ECU

How much does it cost to fix P0571?+

Estimated repair cost for P0571 is $20–$150.

Is P0571 DIY-friendly?+

Yes — P0571 is generally DIY-friendly with basic tools.