AutoCodes – GMC – P0703 2017 GMC Sierra

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

Quick Answer

The Body Control Module (BCM) monitors the brake pedal position sensor. Common causes include Faulty Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection. 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 Body Control Module (BCM), Body Control Module harness is open or shorted, Body Control Module circuit poor electrical connection.
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 202

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 20, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0703 2017 GMC Sierra Description

The Body Control Module (BCM) monitors the brake pedal position sensor. When the brake pedal is applied, the BCM detects a predetermined voltage signal. The BCM sends a serial data message to the Engine Control Module (ECM) indicating the status of the stop lamps. The Diagnostic Trouble Code (DTC) will be set when the ECM receives an invalid brake pedal status serial data message from the BCM.

OBDII Code P0703 2017 GMC Sierra - Brake Switch Signal Message Counter Incorrect - AutoCodes.com — P0703 2017 GMC Sierra Code - Brake Switch Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P0703 2017 GMC Sierra?

Faulty Body Control Module (BCM)
Body Control Module harness is open or shorted
Body Control Module circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0703 2017 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 P0703 2017 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 P0703 2017 GMC Sierra code?

Need more information on how to fix the P0703 2017 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 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.