Cruise Control/Brake Switch A Circuit
The P0571 code means the vehicle's onboard diagnostic system has detected: Cruise Control/Brake Switch A Circuit. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $50 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Cruise control disengages unexpectedly
- Cruise control indicator malfunction
- Cruise control system inoperative
Probable Causes (Ranked by Likelihood)
- Faulty brake switch input to cruise module Very High
- Damaged clockspring or steering column wiring High
- Corroded connector in cruise control circuit Moderate
- ECM or cruise control module input failure Low
Step-by-Step Diagnostic Procedure
-
Use a scan tool to monitor cruise control input signals while operating each switch
-
Inspect cruise control switch and clockspring connections for damage or wear
-
Test the specific circuit for proper voltage and continuity related to the cruise control/brake switch a circuit
-
Check all cruise control fuses and relay connections
Common Fixes by Vehicle
What techs usually find when diagnosing P0571 on specific vehicles — tap your vehicle for the fix and the exact part:
2000-2013 GM trucks/SUVs & Ford easy DIY
Cruise control / brake switch A circuit fault is usually the brake light switch at the pedal. Symptoms often include cruise that will not set and brake lights behaving oddly. The switch is an inexpensive snap-in part at the top of the brake pedal. Adjust it correctly so the plunger seats against the pedal arm.
Labor: 20-40 minFrequently Asked Questions
What does P0571 mean?
P0571 indicates a malfunction in the cruise control/brake switch a circuit. The ECM has detected an abnormal signal in this portion of the cruise control system, preventing proper operation of that function.
Can I still drive safely with this code?
Yes, though brake-related cruise control codes should be addressed promptly for safety. The cruise control system is a convenience feature and this code does not affect engine performance.
Is this a common cruise control problem?
Cruise control switch and wiring issues are relatively common, especially on vehicles with high mileage. The steering column clockspring and switch contacts wear over time from normal use.
Sources
This page is built from documented references. Verify against your own service info before repair work.
P0571 on Diesel, EV & Equipment
The same code ID appears across other engines and platforms. The diagnostic flow varies by manufacturer — these are the platform-specific breakdowns:
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