P0703 2018 Chevrolet Silverado Code - Brake Switch Signal Message Counter Incorrect
Quick Answer
The diagnostic trouble code P0703 in a 2018 Chevrolet Silverado indicates that the Brake Switch Signal Message Counter is incorrect. Common causes include Faulty brake switch, Damaged wiring or connectors in the brake switch circuit, Malfunctioning vehicle computer. 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 brake switch, Damaged wiring or connectors in the brake switch circuit, Malfunctioning vehicle computer.
- 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 P0703 2018 Chevrolet Silverado Description
The diagnostic trouble code P0703 in a 2018 Chevrolet Silverado indicates that the Brake Switch Signal Message Counter is incorrect. This code is typically triggered when the vehicle's onboard computer detects that the signal message counter from the brake switch does not match the expected value. The brake switch is a crucial component that informs the vehicle's computer when the brake pedal is pressed, allowing for proper operation of systems such as the brake lights, cruise control, and transmission shift interlock. When the signal message counter is incorrect, it can lead to issues with the vehicle's performance and safety systems.
Common Causes of P0703 2018 Chevrolet Silverado
- Faulty brake switch.
- Damaged wiring or connectors in the brake switch circuit.
- Malfunctioning vehicle computer.
- Corrosion or debris in the brake switch assembly.
- Loose or disconnected brake switch.
Symptoms of P0703 2018 Chevrolet Silverado
- Brake lights not illuminating when the brake pedal is pressed.
- Inability to engage or disengage cruise control.
- Difficulty shifting out of park.
- Check Engine Light illuminated on the dashboard.
How to Fix P0703 2018 Chevrolet Silverado
- Begin by conducting a thorough inspection of the brake switch, wiring, and connectors for any visible damage or corrosion.
- Test the brake switch using a multimeter to ensure it is functioning properly.
- If the brake switch is faulty, replace it with a new OEM part.
- Clear the diagnostic trouble codes from the vehicle's computer using a scan tool.
- Test drive the vehicle to verify that the issue has been resolved and that the brake switch signal message counter is now correct.
Cost to Fix P0703 2018 Chevrolet Silverado
The typical repair costs for addressing the P0703 code in a 2018 Chevrolet Silverado can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new brake switch, any necessary wiring repairs, and the labor involved in diagnosing and fixing the problem. It's important to note that the actual cost may vary based on factors such as the location of the repair shop, the vehicle's make and model, and the technician's hourly labor rates. It's recommended to obtain quotes from multiple auto repair shops to ensure a competitive price for the repair.
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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.
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