AutoCodes – Audi – P0703 Audi

P0703 Audi 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 Audi 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 1,311

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
FAQs
Comments
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Code P0703 Audi 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 Audi - Brake Switch 'B' Circuit - AutoCodes.com — P0703 Audi Code - Brake Switch 'B' Circuit

What does this mean?

What are the Possible Causes of the DTC P0703 Audi?

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 Audi?

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 Audi 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.

Frequently Asked Questions about P0703 Audi Code

1. What are the common symptoms of OBDII code P0703 in an Audi related to the Brake Switch 'B' Circuit?

The common symptoms include issues with the brake lights, cruise control not working, and the inability to shift out of Park.

2. What are the typical causes of the OBDII code P0703 in an Audi?

Common causes of this code include a faulty brake light switch, wiring issues in the brake switch circuit, or a problem with the brake control module.

3. How can I diagnose the Brake Switch 'B' Circuit issue causing OBDII code P0703 in my Audi?

You can diagnose the issue by checking the brake light operation, inspecting the brake light switch and its wiring, and using an OBDII scanner to read the trouble code.

4. Can a faulty brake switch affect the overall performance of my Audi?

Yes, a faulty brake switch can affect the overall performance by causing issues with the brake lights, cruise control, and the ability to shift gears smoothly.

5. What are some repair tips for fixing the Brake Switch 'B' Circuit problem in an Audi with OBDII code P0703?

Repair tips include replacing the faulty brake light switch, checking and repairing any damaged wiring, and resetting the trouble code with an OBDII scanner after the repair.

6. Is it safe to continue driving my Audi with the OBDII code P0703 related to the Brake Switch 'B' Circuit issue?

It is not recommended to drive the vehicle with this issue as it can affect critical systems like the brake lights and transmission operation.

7. Can I reset the OBDII trouble code P0703 related to the Brake Switch 'B' Circuit in my Audi without fixing the underlying issue?

Resetting the trouble code without fixing the underlying issue will not solve the problem and the code is likely to reappear once the system detects the fault again.

8. How much does it typically cost to repair the Brake Switch 'B' Circuit problem causing OBDII code P0703 in an Audi?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Will replacing the brake light switch fix the OBDII code P0703 issue in my Audi?

In many cases, replacing the brake light switch will resolve the problem causing the OBDII code P0703 related to the Brake Switch 'B' Circuit. However, it's important to diagnose the issue accurately before proceeding with the repair.

10. How can I prevent the OBDII code P0703 related to the Brake Switch 'B' Circuit from recurring in my Audi?

Regularly inspecting and maintaining the brake light switch, ensuring proper wiring connections, and addressing any brake system issues promptly can help prevent the recurrence of this OBDII trouble code.