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P0703 2017 GMC Sierra Code - Brake Switch Signal Message Counter Incorrect

Quick Answer

The P0703 diagnostic trouble code in a 2017 GMC Sierra indicates that the Brake Switch Signal Message Counter is incorrect. Common causes include Faulty brake switch, Damaged wiring or connectors leading to the brake switch, Malfunctioning brake control module. 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
P0703 2017 GMC Sierra indicates Brake Switch Signal Message Counter Incorrect.
Common causes
Common causes include Faulty brake switch, Damaged wiring or connectors leading to the brake switch, Malfunctioning brake control module.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P0703 2017 GMC Sierra Description

The P0703 diagnostic trouble code in a 2017 GMC Sierra indicates that the Brake Switch Signal Message Counter is incorrect. This code typically occurs when the vehicle's onboard computer detects that the number of messages received from the brake switch does not match the expected value. The brake switch is a crucial component that signals when the brake pedal is pressed, allowing the vehicle to engage the brakes and notify other systems of braking activity. When the signal message counter is incorrect, it can lead to various issues with the vehicle's performance and safety systems.

OBDII Code P0703 2017 GMC Sierra - Brake Switch Signal Message Counter Incorrect
P0703 2017 GMC Sierra Code - Brake Switch Signal Message Counter Incorrect

Common Causes of P0703 2017 GMC Sierra

  1. Faulty brake switch.
  2. Damaged wiring or connectors leading to the brake switch.
  3. Malfunctioning brake control module.
  4. Issues with the vehicle's onboard computer.
  5. Water damage or corrosion affecting the brake switch system.

Symptoms of P0703 2017 GMC Sierra

  1. Illumination of the brake warning light on the dashboard.
  2. Inconsistent or delayed response when pressing the brake pedal.
  3. ABS (Anti-lock Braking System) malfunction or activation.
  4. Cruise control may not engage or disengage properly.
  5. Transmission shifting difficulties or erratic behavior.

How to Fix P0703 2017 GMC Sierra

  1. Begin by inspecting the brake switch and its wiring for any visible damage or wear. Replace any damaged components.
  2. Test the brake switch using a multimeter to ensure it is functioning correctly.
  3. Check the brake control module and the vehicle's onboard computer for any faults or errors. Reset or reprogram them if necessary.
  4. Clear the diagnostic trouble codes from the vehicle's computer using a scan tool.
  5. Test drive the vehicle to confirm that the issue has been resolved and that the brake switch signal message counter is now correct.

Cost to Fix P0703 2017 GMC Sierra

The typical repair costs for addressing a P0703 code in a 2017 GMC Sierra can range from $100 to $300, depending on the specific cause of the issue and the labor rates at the auto repair shop. This estimate includes the cost of any necessary parts, such as a new brake switch or wiring, as well as the labor required to diagnose and repair the problem. It is essential to consider that the actual repair costs may vary based on factors such as location, vehicle make and model, and the extent of the issue. It is advisable to consult with a qualified mechanic or repair shop to obtain a more accurate estimate based on the specific circumstances.

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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 P0703 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P0703 in a 2017 GMC Sierra?

The common symptoms include the check engine light turning on, difficulty shifting gears, and potential issues with the vehicle's brake lights.

2. What does the OBDII code P0703 indicate for a 2017 GMC Sierra?

OBDII code P0703 indicates that the brake switch signal message counter is incorrect, which can disrupt the communication between the brake system and the vehicle's transmission control module.

3. What are the possible causes of OBDII code P0703 in a 2017 GMC Sierra?

Possible causes of code P0703 include a faulty brake light switch, issues with the wiring or connectors related to the brake switch, or a malfunctioning transmission control module.

4. How can I diagnose OBDII code P0703 in my 2017 GMC Sierra?

Diagnosing code P0703 involves checking the brake light switch for proper operation, inspecting the wiring and connectors for any damage, and using a diagnostic scanner to read the fault codes stored in the vehicle's computer.

5. Can I drive my 2017 GMC Sierra with OBDII code P0703?

It is not recommended to drive your vehicle with code P0703 as it can lead to transmission shifting problems and potentially unsafe driving conditions. It is best to address the issue promptly.

6. How can I repair OBDII code P0703 in my 2017 GMC Sierra?

Repairing code P0703 may involve replacing the faulty brake light switch, repairing any damaged wiring or connectors, or reprogramming the transmission control module, depending on the root cause of the issue.

7. Is it safe to reset the OBDII code P0703 in a 2017 GMC Sierra without addressing the underlying problem?

Resetting the code without fixing the underlying issue will only temporarily turn off the check engine light. The problem will persist and may lead to further complications if left unattended.

8. Can a DIY enthusiast fix OBDII code P0703 in a 2017 GMC Sierra?

While some DIY enthusiasts may have the skills to diagnose and replace a brake light switch or address wiring issues, it is recommended to consult a professional mechanic for proper diagnosis and repair of code P0703.

9. How much does it cost to repair OBDII code P0703 in a 2017 GMC Sierra?

The cost of repairing code P0703 can vary depending on the underlying cause of the issue, the required parts, and labor costs. It is advisable to obtain quotes from different repair shops for an accurate estimate.

10. How can I prevent OBDII code P0703 from recurring in my 2017 GMC Sierra?

To prevent code P0703 from recurring, ensure regular maintenance of the brake light switch, inspect the wiring for any damage, and address any brake system issues promptly to maintain proper communication with the transmission control module.

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