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Engine-Codes – Generic – P0703

P0703 Code - Brake Switch Performance

Quick Answer

The P0703 diagnostic trouble code (DTC) refers to the Brake Switch Performance. Common causes include Faulty brake switch: The most common cause of a P0703 code is a malfunctioning or defective brake switch, Wiring issues: Damaged or corroded wiring connecting the brake switch to the PCM can also trigger this code, Brake switch misalignment: If the brake switch is not properly aligned or installed incorrectly, it may not function as intended. 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 indicates Brake Switch Performance.
Common causes
Common causes include Faulty brake switch: The most common cause of a P0703 code is a malfunctioning or defective brake switch, Wiring issues: Damaged or corroded wiring connecting the brake switch to the PCM can also trigger this code, Brake switch misalignment: If the brake switch is not properly aligned or installed incorrectly, it may not function as intended.
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 11, 2024
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Code P0703 Description

The P0703 diagnostic trouble code (DTC) refers to the Brake Switch Performance. This code is typically triggered when the powertrain control module (PCM) detects an issue with the brake switch, which is an essential component for various vehicle systems. The brake switch is responsible for signaling the PCM when the brake pedal is depressed, allowing the transmission to shift gears properly, engaging the brake lights, and disabling cruise control.

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

Common Causes of P0703

  1. Faulty brake switch: The most common cause of a P0703 code is a malfunctioning or defective brake switch.
  2. Wiring issues: Damaged or corroded wiring connecting the brake switch to the PCM can also trigger this code.
  3. Brake switch misalignment: If the brake switch is not properly aligned or installed incorrectly, it may not function as intended.
  4. Faulty PCM: In some rare cases, a malfunctioning PCM could misinterpret signals from the brake switch, triggering the P0703 code.

Symptoms of P0703

  1. Inoperative brake lights: One of the most common symptoms associated with a P0703 code is the failure of the brake lights to illuminate when the brake pedal is pressed.
  2. Difficulty shifting gears: The vehicle may have trouble shifting gears smoothly, particularly when coming to a stop or accelerating.
  3. Cruise control not working: The cruise control system may fail to engage or disengage properly when the brake switch is malfunctioning.
  4. Check Engine Light: The Check Engine Light may illuminate on the dashboard as a result of the P0703 code being triggered.

How to Fix P0703

  1. Diagnose the issue: Begin by using a scan tool to retrieve the DTC and determine the specific cause of the P0703 code.
  2. Inspect the brake switch: Check the brake switch for any visible signs of damage or misalignment. Replace the switch if necessary.
  3. Check the wiring: Inspect the wiring harness connected to the brake switch for any damage or corrosion. Repair or replace any faulty wiring.
  4. Reset the PCM: Clear the DTC from the PCM's memory and reset the system to see if the issue has been resolved.
  5. Test drive the vehicle: After completing the repair process, test drive the vehicle to ensure that the brake switch is functioning correctly and that the P0703 code does not reappear.

Cost to Fix P0703

The cost of repairing a P0703 code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $100 to $300 for parts and labor to resolve this problem. Keep in mind that additional diagnostic time may be needed to pinpoint the exact cause of the code, which can increase the overall cost. It's advisable to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for P0703

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).

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Code P0703 Information for Specific Makes

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.

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