P0703 2018 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 2018 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.
Code P0703 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0703 2018 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 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 P0703 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 P0703 2018 GMC Sierra code?
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Frequently Asked Questions about P0703 2018 GMC Sierra Code
What does the P0703 code mean on a 2018 GMC Sierra?
The P0703 code indicates an issue with the brake switch signal, specifically an incorrect message counter being detected by the powertrain control module (PCM).
What are common symptoms of the P0703 code?
Symptoms include difficulty shifting gears, cruise control not functioning, reduced engine performance, or the check engine light illuminating.
What causes the P0703 code on a GMC Sierra?
Common causes include a faulty brake switch, damaged wiring or connectors in the brake switch circuit, or issues with the PCM.
Can a faulty brake switch trigger the P0703 code?
Yes, a malfunctioning brake switch is one of the most common causes of the P0703 code.
How can I diagnose the P0703 code?
Start by inspecting the brake switch and its wiring for damage or loose connections. Use a scan tool to monitor the brake switch signal and verify its operation.
Is it safe to drive with the P0703 code on a 2018 GMC Sierra?
It is not recommended as it may impact vehicle safety features like cruise control and proper gear shifting.
How do I fix the P0703 code?
Repairs may include replacing the brake switch, repairing or replacing damaged wiring, or addressing issues with the PCM.
Can the P0703 code affect the cruise control system?
Yes, the cruise control system relies on the brake switch signal, so this code can cause it to stop functioning.
Do I need a professional to fix the P0703 code?
While simple issues like a damaged brake switch can be fixed by someone with basic mechanical skills, complex wiring or PCM problems may require a professional diagnosis.
Will clearing the P0703 code with a scan tool fix the problem?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be repaired to prevent the code from returning.
Discuss the causes and fixes for P0703 2018 GMC Sierra OBDII Code
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