AutoCodes – Mercedes-Benz – P0703 Mercedes-Benz

P0703 Mercedes-Benz Code - Brake Switch Performance

Quick Answer

The Brake Pedal Position (BPP) switch is sometimes referred to as the stop lamp switch. Common causes include Faulty Brake Pedal Position (BPP) Switch (Stop Lamp Switch), Misadjusted Brake Pedal Position Switch, Brake Pedal Position Switch harness is open or shorted. 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 Mercedes-Benz indicates Brake Switch Performance.
Common causes: Common causes include Faulty Brake Pedal Position (BPP) Switch (Stop Lamp Switch), Misadjusted Brake Pedal Position Switch, Brake Pedal Position Switch harness is open or shorted.
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 26,282

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0703 Mercedes-Benz Description

The Brake Pedal Position (BPP) switch is sometimes referred to as the stop lamp switch. The BPP switch provides a signal to the Engine Control Module (ECM) indicating the brakes are applied. The BPP switch is normally open and mounted on the brake pedal support. The Engine Control Module monitors the BPP switch. The Diagnostic Trouble Code (DTC) will set when the Engine Control Module did not receive a BPP switch input.

OBDII Code P0703 Mercedes-Benz - Brake Switch Performance - AutoCodes.com — P0703 Mercedes-Benz Code - Brake Switch Performance

What does this mean?

What are the Possible Causes of the DTC P0703 Mercedes-Benz?

Faulty Brake Pedal Position (BPP) Switch (Stop Lamp Switch)
Misadjusted Brake Pedal Position Switch
Brake Pedal Position Switch harness is open or shorted
Brake Pedal Position Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0703 Mercedes-Benz?

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 does this mean?

Code Tech Notes

Check if the stop light works with when the brake pedal is depressed if the brake lights are inoperative, replace or adjust the Brake Pedal Position (BPP) Switch (Stop Lamp Switch).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0703 Mercedes-Benz 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 Mercedes-Benz code?

Need more information on how to fix the P0703 Mercedes-Benz code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 Mercedes-Benz Code

1. What are the common symptoms of OBDII code P0703 in a Mercedes-Benz related to brake switch performance?

- Common symptoms include issues with the brake lights not functioning properly, difficulty shifting gears, and the inability to start the vehicle.

2. What are the possible causes of OBDII code P0703 in a Mercedes-Benz?

- The most common causes of this code include a faulty brake light switch, wiring problems, or issues with the brake light circuit.

3. How can I diagnose the OBDII code P0703 in my Mercedes-Benz?

- To diagnose this code, you can start by checking the brake light functionality, inspecting the brake light switch, and testing the wiring and connections related to the brake switch.

4. Can I drive my Mercedes-Benz with an OBDII code P0703 related to brake switch performance?

- It is not recommended to drive the vehicle with this code as it can affect the safety and functionality of the brake system and the vehicle's ability to shift gears properly.

5. How can I repair OBDII code P0703 in my Mercedes-Benz?

- To repair this code, you may need to replace the faulty brake light switch, repair any damaged wiring, or address any issues with the brake light circuit.

6. Will OBDII code P0703 in a Mercedes-Benz cause the check engine light to illuminate?

- Yes, this code can trigger the check engine light to illuminate due to the issues related to brake switch performance.

7. Can a DIY enthusiast fix OBDII code P0703 in a Mercedes-Benz?

- Depending on your level of experience and access to tools, a DIY enthusiast may be able to fix this code by following repair guides and instructions specific to the Mercedes-Benz model.

8. How much does it cost to repair OBDII code P0703 in a Mercedes-Benz at a dealership or repair shop?

- The cost of repair can vary depending on the exact cause of the code, but it may involve a few hours of labor and the cost of replacement parts such as the brake light switch.

9. Are there any preventive measures to avoid OBDII code P0703 in a Mercedes-Benz?

- Regularly checking the functionality of the brake lights and addressing any issues promptly can help prevent the occurrence of this code in a Mercedes-Benz.

10. Can OBDII code P0703 in a Mercedes-Benz affect the overall performance of the vehicle?

- Yes, this code can affect the overall performance of the vehicle by causing issues with shifting gears, starting the engine, and the proper operation of the brake lights.