AutoCodes – Buick – P25C9 Buick

P25C9 Buick Code - Brake System Control Module 2 Requested MIL Illumination

Quick Answer

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. Common causes include Check Brake System Control Module for codes, Faulty Brake System Control Module. 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: P25C9 Buick indicates Brake System Control Module 2 Requested MIL Illumination.
Common causes: Common causes include Check Brake System Control Module for codes, Faulty Brake System Control Module.
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 434

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 Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P25C9 Buick Description

Control modules constantly monitor the vehicle for any condition which may adversely affect vehicle performance. If a condition is detected, the module sets a Diagnostic Trouble Code (DTC) and sends a serial data message to the Engine Control Module (ECM). The ECM sets a DTC to inform that the module has set a DTC. The serial data message sent by the module also contains a request for the ECM to illuminate the Malfunction Indicator Lamp (MIL).
The DTC will be set when the ECM receives a serial data message from the Brake System Control Module indicating that DTC has been set in the module.

OBDII Code P25C9 Buick - Brake System Control Module 2 Requested MIL Illumination - AutoCodes.com — P25C9 Buick Code - Brake System Control Module 2 Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P25C9 Buick?

Check Brake System Control Module for codes
Faulty Brake System Control Module

How to Fix the DTC P25C9 Buick?

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 P25C9 Buick 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 P25C9 Buick code?

Need more information on how to fix the P25C9 Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P25C9 Buick code diagnosed by a professional: Find a repair shop in your area

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 P25C9 Buick Code

1. What are the common symptoms of OBDII code P25C9 in a Buick related to the Brake System Control Module 2 Requested MIL Illumination?

- Common symptoms may include the illumination of the malfunction indicator lamp (MIL) on the dashboard and potential issues with the brake system's control module.

2. What are some possible causes of OBDII code P25C9 in a Buick?

- Possible causes may include a malfunction in the brake system control module, electrical faults, or communication issues within the vehicle's network.

3. How can I diagnose OBDII code P25C9 in my Buick related to the Brake System Control Module 2 Requested MIL Illumination?

- Diagnosis involves using an OBDII scanner to retrieve the specific fault code, checking for related symptoms, and inspecting the brake system control module for any visible signs of damage or corrosion.

4. Is it safe to drive my Buick with OBDII code P25C9 triggered?

- It is recommended to address the issue as soon as possible to prevent potential safety hazards related to the brake system. It is advisable to have the vehicle inspected by a qualified mechanic.

5. Can I reset the OBDII code P25C9 in my Buick on my own?

- While you can try resetting the code with an OBDII scanner, it is crucial to investigate and address the root cause of the issue to prevent the code from reoccurring.

6. Are there any common repair tips for fixing OBDII code P25C9 in a Buick?

- Common repair tips may include checking and repairing any damaged wiring, ensuring proper connections to the brake system control module, and clearing the code after resolving the underlying issue.

7. How much does it typically cost to repair OBDII code P25C9 in a Buick at a dealership or repair shop?

- Repair costs can vary depending on the extent of the issue and the labor rates of the service provider. It is recommended to obtain quotes from different shops for a more accurate estimate.

8. Can a DIY enthusiast with limited automotive knowledge fix OBDII code P25C9 in a Buick?

- While some basic troubleshooting steps can be performed by DIY enthusiasts, addressing complex issues related to the brake system control module may require professional expertise to ensure proper diagnosis and repair.

9. Will OBDII code P25C9 cause my Buick to fail an emissions test?

- Depending on local regulations, a triggered MIL related to the brake system control module may result in a failed emissions test. It is advisable to address the issue promptly to pass the inspection.

10. How often does OBDII code P25C9 related to the Brake System Control Module 2 Requested MIL Illumination occur in Buick vehicles?

- The occurrence of this specific OBDII code can vary among Buick vehicles, but it is essential to address it promptly to maintain the safety and performance of the brake system.