AutoCodes – Generic – C2504

C2504 Code - Brake Missing Message

Quick Answer

The Drivetrain Control Module (DTCM) monitors the Anti-Lock Brake System (ABS) Module. Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) Module 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: C2504 indicates Brake Missing Message.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Module, Anti-Lock Brake System (ABS) Module harness is open or shorted, Anti-Lock Brake System (ABS) Module 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 1,566

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C2504 Description

The Drivetrain Control Module (DTCM) monitors the Anti-Lock Brake System (ABS) Module. The DTCM sets the OBDII code when the ABS Module is not to factory specifications.

OBDII Code C2504 - Brake Missing Message - AutoCodes.com — C2504 Code - Brake Missing Message

What does this mean?

What are the Possible Causes of the DTC C2504?

Faulty Anti-Lock Brake System (ABS) Module
Anti-Lock Brake System (ABS) Module harness is open or shorted
Anti-Lock Brake System (ABS) Module circuit poor electrical connection

How to Fix the DTC C2504?

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 C2504 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 C2504 code?

Need more information on how to fix the C2504 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2504 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C2504 Chrysler — Brake Missing Message
C2504 Dodge — Brake Missing Message
C2504 Fiat — Brake Missing Message
C2504 Jeep — Brake Missing Message
C2504 RAM — Brake Missing Message

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 C2504 Code

1. What does OBDII code C2504 Brake Missing Message mean?

The code C2504 indicates that the vehicle's onboard computer is not receiving the expected brake message signal.

2. What are common symptoms of OBDII code C2504?

Common symptoms of code C2504 may include the brake warning light illuminating on the dashboard, loss of certain brake functions, and potential issues with the vehicle's stability control system.

3. What can cause the OBDII code C2504 Brake Missing Message?

Possible causes of code C2504 include a faulty brake control module, damaged wiring or connectors in the brake system, or issues with the electronic brake control module.

4. How can I diagnose the OBDII code C2504?

Diagnosing code C2504 typically involves using a diagnostic scan tool to read the code, checking the brake system for any visible damage or issues, and testing the brake control module for proper function.

5. Can I still drive my vehicle with the OBDII code C2504 present?

It is not recommended to drive your vehicle with the code C2504 active, as it may indicate potential safety issues with the brake system that could affect vehicle performance and control.

6. How do I repair OBDII code C2504 Brake Missing Message?

Repairing code C2504 may involve replacing the brake control module, repairing any damaged wiring or connectors, or addressing any underlying issues affecting the brake system's communication.

7. Are there any DIY tips for fixing OBDII code C2504?

While some basic checks like inspecting wiring connections can be done DIY, it is recommended to consult a professional mechanic for a comprehensive diagnosis and repair of code C2504.

8. How much does it cost to fix OBDII code C2504?

The cost of fixing code C2504 can vary depending on the specific cause of the issue, the extent of repairs needed, and labor rates in your area. It's best to get a diagnostic assessment from a qualified mechanic for an accurate estimate.

9. Can a low brake fluid level trigger OBDII code C2504?

A low brake fluid level is typically not a direct cause of code C2504. However, it is essential to maintain proper brake fluid levels to ensure the overall health and function of the brake system.

10. Will resetting the OBDII system clear the C2504 code?

Resetting the OBDII system may temporarily clear the C2504 code, but if the underlying issue persists, the code is likely to return. It's crucial to diagnose and address the root cause of the problem to prevent future occurrences.