P0571 2018 GMC Sierra Code - Cruise Control Brake Switch Circuit
Quick Answer
The Engine Control Module (ECM) monitors the Brake Pedal Position Sensor. Common causes include Faulty Brake Pedal Position Sensor, Misadjusted Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0571 2018 GMC Sierra indicates Cruise Control Brake Switch Circuit.
- Common causes
- Common causes include Faulty Brake Pedal Position Sensor, Misadjusted Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0571 2018 GMC Sierra Description
This diagnostic test functions on the assumption that a sudden decrease in vehicle speed is caused by a brake pedal application. When the ECM detects that there is a 4.2 km/h (2.6 mph) or greater decrease in vehicle speed within 0.25 seconds without a transition of the stop lamp switch, the ECM sets Diagnostic Trouble Code (DTC) P0571.
The DTC will be set when the BCM detects either a low voltage signal on the stop lamp switch signal circuit when the serial data message from the ECM indicates the brakes are applied or a high voltage signal on the stop lamp switch signal circuit when the serial data message from the ECM indicates the brakes are not applied.
What are the Possible Causes of the DTC P0571 2018 GMC Sierra?
- Faulty Brake Pedal Position Sensor
- Misadjusted Brake Pedal Position Sensor
- Brake Pedal Position Sensor harness is open or shorted
- Brake Pedal Position Sensor circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC P0571 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0571 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0571 2018 GMC Sierra Code
1. What is the meaning of OBDII code P0571 on a 2018 GMC Sierra?
- The OBDII code P0571 indicates a Cruise Control Brake Switch Circuit malfunction in a 2018 GMC Sierra.
2. What are the common symptoms of a Cruise Control Brake Switch Circuit issue (P0571) in a 2018 GMC Sierra?
- Common symptoms include inoperative cruise control, difficulty engaging or disengaging cruise control, and the inability to set a cruising speed.
3. What are the possible causes of OBDII code P0571 in a 2018 GMC Sierra?
- The most common causes of code P0571 are a faulty brake light switch, damaged wiring or connectors in the brake switch circuit, or a malfunctioning cruise control module.
4. How can I diagnose a Cruise Control Brake Switch Circuit issue (P0571) in a 2018 GMC Sierra?
- To diagnose a P0571 code, you can visually inspect the brake light switch and its wiring, test the brake switch for continuity, and use a scan tool to check for related error codes.
5. Can a faulty Cruise Control Brake Switch Circuit (P0571) impact vehicle safety?
- Yes, a malfunctioning brake switch circuit can affect the operation of the brake lights, cruise control system, and other safety features, so it is important to address this issue promptly.
6. How can I repair an OBDII code P0571 on a 2018 GMC Sierra?
- Repair options may include replacing the brake light switch, repairing damaged wiring or connectors, resetting the error code with a scan tool, or seeking professional assistance for further diagnosis.
7. Does the Cruise Control Brake Switch Circuit issue (P0571) affect the drivability of a 2018 GMC Sierra?
- While the vehicle may still be drivable with a P0571 code, the cruise control functionality may be compromised, leading to inconvenience during highway driving.
8. Can I reset the OBDII code P0571 in a 2018 GMC Sierra by disconnecting the battery?
- Disconnecting the battery may temporarily clear the code, but it is recommended to address the root cause of the issue to prevent the code from reappearing.
9. Is it safe to continue driving a 2018 GMC Sierra with an unresolved P0571 code?
- It is generally safe to drive the vehicle with a P0571 code, but it is important to address the underlying problem to ensure proper functioning of the cruise control and brake lights.
10. How much does it typically cost to repair an OBDII code P0571 on a 2018 GMC Sierra?
- The cost of repairing a P0571 code can vary depending on the cause of the issue, but it may involve parts replacement and labor costs that can range from $100 to $300 or more.
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