AutoCodes – GMC – P0571 2016 GMC Sierra

P0571 2016 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 2016 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.

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Code Popularity 205

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 14, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0571 2016 GMC Sierra Description

The Engine Control Module (ECM) monitors the Brake Pedal Position Sensor. When the brake pedal is applied, the ECM detects a predetermined voltage signal. The ECM sends a serial data message to the Body Control Module (BCM) indicating the status of the stop lamps.
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.

OBDII Code P0571 2016 GMC Sierra - Cruise Control Brake Switch Circuit - AutoCodes.com — P0571 2016 GMC Sierra Code - Cruise Control Brake Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P0571 2016 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 2016 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 2016 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.

Need more information about the P0571 2016 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0571 2016 GMC Sierra Code

What does the OBDII code P0571 mean on a 2016 GMC Sierra?

1. Code P0571 indicates an issue with the Cruise Control Brake Switch Circuit, which monitors the brake pedal's position to disable cruise control when the brakes are pressed. 2.

What are the common symptoms of code P0571 on a 2016 GMC Sierra?

Symptoms may include cruise control not functioning, brake lights staying on or off incorrectly, and the check engine light illuminating. 3.

What causes the P0571 code to appear on my GMC Sierra?

Common causes include a faulty brake switch, damaged wiring or connectors in the brake switch circuit, or a blown fuse. 4.

Can I still drive my 2016 GMC Sierra with a P0571 code?

Yes, but you may experience cruise control issues and potentially unsafe brake light operation, so it’s best to address the issue promptly. 5.

How do I fix the P0571 code on a 2016 GMC Sierra?

Inspect the brake switch, wiring, and connectors for damage or wear. Replace the brake switch if faulty and repair any damaged wiring as needed. 6.

How much does it cost to repair a P0571 code on a GMC Sierra?

Repair costs can vary but typically range from $50 to $200, depending on whether the brake switch or wiring needs replacement. 7.

Can a blown fuse trigger the P0571 code?

Yes, a blown fuse in the brake light or cruise control circuit can cause this code to appear. 8.

How do I test the brake switch on my 2016 GMC Sierra?

Use a multimeter to check the brake switch for proper continuity when the pedal is pressed and released. Replace the switch if it fails the test. 9.

Will a P0571 code cause my cruise control to stop working?

Yes, the cruise control system relies on the brake switch circuit to disengage when braking, so a malfunction can disable cruise control. 10.

Can a dirty or misaligned brake switch cause the P0571 code?

Yes, dirt or misalignment can prevent the brake switch from functioning correctly, triggering the P0571 code. Cleaning or adjusting the switch may resolve the issue.