AutoCodes – Chevrolet – P0703 2018 Chevrolet Silverado

P0703 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 372

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado - Brake Switch Signal Message Counter Incorrect - AutoCodes.com — P0703 2018 Chevrolet Silverado Code - Brake Switch Signal Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P0703 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado?

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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado code?

Need more information on how to fix the P0703 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado Code

1. What does OBDII code P0703 mean on a 2018 Chevrolet Silverado?

Code P0703 indicates that the Brake Switch Signal Message Counter is incorrect, meaning the transmission control module (TCM) is receiving erratic or unexpected signals from the brake switch.

2. What are the common symptoms of code P0703 on a Chevy Silverado?

Common symptoms include the check engine light turning on, issues with cruise control functionality, and possible transmission shifting problems.

3. What causes code P0703 to appear on a 2018 Silverado?

Potential causes include a faulty brake light switch, damaged wiring or connectors, misaligned brake pedal, or a malfunctioning TCM.

4. Can a faulty brake light switch trigger the P0703 code?

Yes, a faulty or worn-out brake light switch is one of the most common causes of the P0703 code.

5. How do I diagnose the P0703 code on my Silverado?

Start by checking the brake light switch and its wiring for damage. Use a diagnostic scanner to monitor brake switch signals and ensure proper communication with the TCM.

6. Can I drive my 2018 Silverado with a P0703 code active?

While the truck may still be drivable, it is not recommended, as the issue could interfere with transmission operation or safety features like cruise control.

7. How do I fix the P0703 code on a Chevy Silverado?

Repairs may involve replacing the brake light switch, fixing or replacing damaged wiring, clearing any TCM faults, or recalibrating the brake pedal position sensor if needed.

8. How much does it cost to repair a P0703 code on a Silverado?

Depending on the issue, repairs could range from $50 to $200 for a brake light switch replacement or wiring repair, plus labor costs if performed by a mechanic.

9. Will disconnecting the battery clear the P0703 code?

While disconnecting the battery may temporarily clear the code, the underlying issue must be resolved to prevent it from returning.

10. Can a TCM software update fix the P0703 code?

In rare cases, a TCM software update may address communication errors, but this is typically only necessary after ruling out hardware and wiring issues.