AutoCodes – Mercury – B2479 Mercury

B2479 Mercury Code - Brake Park Switch Circuit Short To Ground

Quick Answer

The Instrument Cluster (IC) uses 3 basic messaged inputs to control the brake warning indicator. Common causes include Faulty Brake Park Switch, Brake Park Switch harness is open or shorted, Brake Park 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: B2479 Mercury indicates Brake Park Switch Circuit Short To Ground.
Common causes: Common causes include Faulty Brake Park Switch, Brake Park Switch harness is open or shorted, Brake Park 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 1,505

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 Dec 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code B2479 Mercury Description

The Instrument Cluster (IC) uses 3 basic messaged inputs to control the brake warning indicator. The first 2 are the parking brake warning indicator switch and brake fluid level switch. The third is for the Electronic Brake Distribution (EBD), controlled by the ABS. The parking brake warning indicator switch and the brake fluid level switch status are sent from the Smart Junction Box (SJB) over the Medium Speed Controller Area Network (MS-CAN) communication bus. The EBD message is sent from the ABS module over the High Speed Controller Area Network (HS-CAN) communication bus lines.

OBDII Code B2479 Mercury - Brake Park Switch Circuit Short To Ground - AutoCodes.com — B2479 Mercury Code - Brake Park Switch Circuit Short To Ground

What does this mean?

What are the Possible Causes of the DTC B2479 Mercury?

Faulty Brake Park Switch
Brake Park Switch harness is open or shorted
Brake Park Switch circuit poor electrical connection

How to Fix the DTC B2479 Mercury?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B2479 Mercury 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 B2479 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 B2479 Mercury Code

1. What are the common symptoms of OBDII code B2479 Mercury (Brake Park Switch Circuit Short To Ground)?

- Common symptoms include the brake lights staying on constantly, inability to shift out of park, and the vehicle not recognizing when the brake is depressed.

2. What can cause the OBDII code B2479 Mercury to appear?

- The code can appear due to a short circuit in the brake park switch circuit that leads to ground, often caused by damaged wiring or a faulty brake park switch.

3. How can I diagnose the OBDII code B2479 Mercury issue?

- Diagnose the issue by inspecting the brake park switch wiring for damage, testing the brake park switch for proper functioning, and using an OBDII scanner to read the trouble code.

4. Is it safe to drive with the OBDII code B2479 Mercury illuminated?

- It is not recommended to drive with the code illuminated, as it can affect the proper operation of the brake lights and the ability to shift out of park, potentially compromising safety.

5. How can I repair the OBDII code B2479 Mercury issue?

- Repair the issue by repairing or replacing any damaged wiring in the brake park switch circuit, ensuring proper connection and functionality of the brake park switch.

6. Can I reset the OBDII code B2479 Mercury without repairing the issue?

- While you can clear the code with an OBDII scanner, it is important to address the underlying issue causing the code to prevent further problems.

7. Are there any tips for preventing the OBDII code B2479 Mercury from reoccurring?

- Regularly inspect the brake park switch circuit for damage, maintain proper wiring connections, and promptly address any issues with the brake park switch to prevent the code from reoccurring.

8. Can a DIY enthusiast fix the OBDII code B2479 Mercury issue at home?

- Depending on your skill level and access to tools, repairing the issue at home is possible by following proper diagnostic procedures and repair steps outlined in the vehicle's service manual.

9. Is the OBDII code B2479 Mercury a common issue in Mercury vehicles?

- While not extremely common, the code can occur in Mercury vehicles, especially in older models with wiring or switch-related issues.

10. Can the OBDII code B2479 Mercury affect the overall performance of the vehicle?

- While the code itself may not affect performance, unresolved issues with the brake park switch circuit can lead to safety concerns and potentially impact the vehicle's overall functionality.