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Engine-Codes – Mercury – P0703 Mercury

P0703 Mercury Code - Brake Switch Performance

Quick Answer

The P0703 code for Mercury vehicles indicates a problem with the brake switch performance. Common causes include Faulty brake switch, Loose or damaged wiring connected to the brake switch, Corrosion or dirt buildup affecting the brake switch performance. 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 Mercury indicates Brake Switch Performance.
Common causes
Common causes include Faulty brake switch, Loose or damaged wiring connected to the brake switch, Corrosion or dirt buildup affecting the brake switch performance.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0703 Mercury Description

The P0703 code for Mercury vehicles indicates a problem with the brake switch performance. The brake switch is a crucial component of the vehicle's braking system, as it is responsible for sending a signal to the vehicle's engine control module (ECM) when the brake pedal is pressed. This signal is used to disengage the cruise control, activate the brake lights, and potentially interrupt the transmission shift sequence.

OBDII Code P0703 Mercury - Brake Switch Performance
P0703 Mercury Code - Brake Switch Performance

Common Causes of P0703 Mercury

  1. Faulty brake switch.
  2. Loose or damaged wiring connected to the brake switch.
  3. Corrosion or dirt buildup affecting the brake switch performance.
  4. Faulty ECM or transmission control module.
  5. Software issue within the vehicle's computer system.

Symptoms of P0703 Mercury

  1. Cruise control fails to disengage when the brake pedal is pressed.
  2. Brake lights do not illuminate when the brake pedal is pressed.
  3. Transmission shifts erratically or delays in shifting.
  4. Check Engine Light (CEL) is illuminated on the dashboard.

How to Fix P0703 Mercury

  1. Begin by locating the brake switch, typically located near the brake pedal.
  2. Check the wiring harness connected to the brake switch for any signs of damage or corrosion. Replace or repair as needed.
  3. Test the brake switch using a multimeter to ensure it is functioning properly. Replace the switch if it fails the test.
  4. Clear the diagnostic trouble codes from the vehicle's ECM using an OBD-II scanner.
  5. Test drive the vehicle to ensure the issue has been resolved and that the brake switch is now functioning correctly.

Cost to Fix P0703 Mercury

The typical repair costs for addressing a P0703 code related to brake switch performance can range from $100 to $300, including parts and labor. However, it is important to note that actual costs may vary depending on the specific diagnosis time and labor rates at auto repair shops, as well as factors such as the vehicle's make and model, and any additional components that may need to be replaced. It is recommended to consult with a professional mechanic for a more precise estimate based on your specific circumstances.

What does this mean?

Tech Notes for P0703 Mercury

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).

Need more information about the P0703 Mercury 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 Mercury Code

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

- Common symptoms include the inability to shift out of park, intermittent or complete loss of brake lights, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P0703 in a Mercury vehicle?

- The code P0703 in a Mercury is usually triggered by a malfunctioning brake light switch, faulty wiring related to the switch, or a problem with the shift interlock solenoid.

3. How can I diagnose the issue causing OBDII code P0703 in my Mercury?

- To diagnose the problem, you can start by checking the brake light operation, inspecting the brake light switch and its wiring for any damage, and testing the shift interlock solenoid for proper function.

4. Can a malfunctioning brake switch affect the driving performance of my Mercury?

- Yes, a malfunctioning brake switch can affect the driving performance of your Mercury by preventing you from shifting out of park or causing issues with the brake lights, which are important for safety.

5. Are there any simple repair tips for fixing OBDII code P0703 in a Mercury?

- Simple repair tips include checking and adjusting the brake light switch position, replacing the brake light switch if it is faulty, and ensuring all wiring connections are secure and free of corrosion.

6. Is it safe to continue driving my Mercury with OBDII code P0703 related to brake switch performance?

- It is not recommended to drive your Mercury with OBDII code P0703, as it can impact the vehicle's safety systems and overall performance. It is best to address the issue promptly.

7. How much does it typically cost to repair OBDII code P0703 in a Mercury at a repair shop?

- The cost of repairing OBDII code P0703 in a Mercury can vary depending on the specific cause of the issue and the labor rates of the repair shop. It is advisable to get a diagnostic and repair estimate from a qualified mechanic.

8. Can I reset the OBDII code P0703 in my Mercury on my own?

- While you can reset the OBDII code P0703 using an OBDII scanner, it is important to first diagnose and fix the underlying issue causing the code to prevent it from reoccurring.

9. Will fixing OBDII code P0703 in my Mercury improve fuel efficiency or performance?

- Fixing OBDII code P0703 related to brake switch performance will not directly improve fuel efficiency or performance, but it will ensure the proper operation of critical safety systems in your vehicle.

10. How can I prevent OBDII code P0703 from occurring in my Mercury in the future?

- Regularly inspecting and maintaining the brake light switch, ensuring proper wiring connections, and addressing any brake light issues promptly can help prevent OBDII code P0703 from occurring in your Mercury.

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