AutoCodes – GMC – P0573 2018 GMC Sierra

P0573 2018 GMC Sierra Code - Brake Switch Circuit High Voltage

Quick Answer

The Brake Pedal Position Sensor signal circuit is a B+ input from the Body Control Module (BCM) to the Engine Control Module (ECM). 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: P0573 2018 GMC Sierra indicates Brake Switch Circuit High Voltage.
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 298

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 P0573 2018 GMC Sierra Description

The Brake Pedal Position Sensor signal circuit is a B+ input from the Body Control Module (BCM) to the Engine Control Module (ECM). The BCM and ECM monitor the Brake Pedal Position Sensor signal circuit to detect when the brake pedal has been applied. When the brake pedal is applied, the BCM supplies B+ on the stop lamp signal circuit and also sends a serial data message to the ECM indicating that the brake pedal has been applied. This Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to voltage on the discrete brake signal circuit when the serial data message from the BCM indicates the brakes are not applied. This diagnostic will run when the serial data message and the voltage signal on the brake switch signal circuit do not match for 8 out 10 times, and the condition is present for greater than 2 s.

OBDII Code P0573 2018 GMC Sierra - Brake Switch Circuit High Voltage - AutoCodes.com — P0573 2018 GMC Sierra Code - Brake Switch Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0573 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 P0573 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 P0573 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.

Need more information about the P0573 2018 GMC Sierra code?

Need more information on how to fix the P0573 2018 GMC Sierra code? Get Access to Factory Service Manuals

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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 P0573 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0573 in a 2018 GMC Sierra?

- Common symptoms include the brake lights staying on constantly, cruise control not working, and potential issues with shifting out of park.

2. What does the OBDII code P0573 Brake Switch Circuit High Voltage mean for a 2018 GMC Sierra?

- This code indicates that the brake switch circuit is registering a higher-than-normal voltage, potentially causing various brake-related issues.

3. What are the possible causes of OBDII code P0573 in a 2018 GMC Sierra?

- The possible causes include a faulty brake light switch, wiring issues in the brake light circuit, a malfunctioning brake pedal position sensor, or a problem with the vehicle's electronic control module (ECM).

4. How can I diagnose the OBDII code P0573 in my 2018 GMC Sierra?

- Diagnosing this code involves checking the brake light switch for proper operation, inspecting the wiring for any damage or corrosion, and testing the brake pedal position sensor using a multimeter.

5. Is it safe to continue driving with OBDII code P0573 illuminated in a 2018 GMC Sierra?

- It is not recommended to drive with this code active, as it can affect the vehicle's brake system functionality and compromise safety.

6. Can I repair OBDII code P0573 in my 2018 GMC Sierra myself?

- Depending on your mechanical skills, you may be able to replace the brake light switch or repair wiring issues yourself. However, more complex repairs may require professional assistance.

7. How much does it typically cost to repair OBDII code P0573 in a 2018 GMC Sierra?

- The cost of repairing this code can vary based on the underlying cause. Simple fixes like replacing the brake light switch may cost around $50-$100, while more involved repairs could be several hundred dollars.

8. Will resetting the OBDII code P0573 in my 2018 GMC Sierra make it go away permanently?

- Resetting the code may temporarily turn off the warning light, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again.

9. Can OBDII code P0573 in a 2018 GMC Sierra cause the vehicle to fail an emissions test?

- Yes, if the code is not resolved and the Check Engine light is illuminated during an emissions test, it is likely to result in a failed inspection.

10. How long does it typically take to repair OBDII code P0573 in a 2018 GMC Sierra?

- The repair time can vary depending on the specific cause of the code and the complexity of the fix. Simple repairs may take an hour or two, while more complicated issues could require several hours or more.