AutoCodes – Volkswagen – P0703 Volkswagen

P0703 Volkswagen Code - Brake Switch 'B' Circuit

Quick Answer

This fault code is stored in the engine control module when a malfunction is detected in the brake pedal switch circuit. Common causes include Faulty Brake Switch, Brake Switch harness is open or shorted, Brake Switch 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 Volkswagen indicates Brake Switch 'B' Circuit.
Common causes: Common causes include Faulty Brake Switch, Brake Switch harness is open or shorted, Brake Switch 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.

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Code Popularity 11,114

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 02, 2021

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
Comments
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Code P0703 Volkswagen Description

This fault code is stored in the engine control module when a malfunction is detected in the brake pedal switch circuit. Two separate switches can be fitted to the vehicle or one component with both switches integrated can be fitted to the vehicle. A plausibility check is carried out between both brake pedal switches and the accelerator pedal position sensor. The configuration of the switches can be: one switch will be normally open type and the other switch will be a normally closed type. A voltage drop test can be used to validate the operation of the circuit. The signal from the switch is used by the engine control module, anti-lock brake control module and to actuate the brake lights.

OBDII Code P0703 Volkswagen - Brake Switch 'B' Circuit - AutoCodes.com — P0703 Volkswagen Code - Brake Switch 'B' Circuit

What does this mean?

What are the Possible Causes of the DTC P0703 Volkswagen?

Faulty Brake Switch
Brake Switch harness is open or shorted
Brake Switch circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0703 Volkswagen?

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 when the brake pedal is depressed if the brake lights are inoperative, replace or adjust the Brake Switch (Stop Lamp Switch).

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0703 Volkswagen 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.

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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.