AutoCodes – GMC – P25A2 2018 GMC Sierra

P25A2 2018 GMC Sierra Code - Brake System Control Module 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: P25A2 2018 GMC Sierra indicates Brake System Control Module 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 906

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 P25A2 2018 GMC Sierra 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 P25A2 2018 GMC Sierra - Brake System Control Module Requested MIL Illumination - AutoCodes.com — P25A2 2018 GMC Sierra Code - Brake System Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P25A2 2018 GMC Sierra?

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

How to Fix the DTC P25A2 2018 GMC Sierra?

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 P25A2 2018 GMC Sierra 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 P25A2 2018 GMC Sierra code?

Need more information on how to fix the P25A2 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P25A2 2018 GMC Sierra 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 P25A2 2018 GMC Sierra Code

1. What does OBDII code P25A2 mean for a 2018 GMC Sierra?

The code P25A2 in a 2018 GMC Sierra indicates an issue with the Brake System Control Module Requested Malfunction Indicator Lamp (MIL) Illumination.

2. What are the common symptoms of OBDII code P25A2 in a 2018 GMC Sierra?

Common symptoms of OBDII code P25A2 in a 2018 GMC Sierra may include the check engine light or brake warning light illuminating on the dashboard.

3. What are the possible causes of OBDII code P25A2 in a 2018 GMC Sierra?

Possible causes of code P25A2 in a 2018 GMC Sierra include a faulty brake system control module, wiring issues, or a malfunction within the brake system.

4. How serious is OBDII code P25A2 in a 2018 GMC Sierra?

Code P25A2 in a 2018 GMC Sierra should be addressed promptly as it relates to the brake system control module. Ignoring this code could potentially lead to brake system malfunctions.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P25A2 illuminated?

It is not recommended to continue driving your 2018 GMC Sierra with the code P25A2 illuminated, as it may indicate an underlying issue with the brake system that requires attention.

6. What should I do if OBDII code P25A2 appears in my 2018 GMC Sierra?

If OBDII code P25A2 appears in your 2018 GMC Sierra, it is advisable to have the vehicle inspected by a qualified mechanic to diagnose and address the root cause of the issue.

7. How is OBDII code P25A2 in a 2018 GMC Sierra typically diagnosed?

Diagnosing OBDII code P25A2 in a 2018 GMC Sierra usually involves using a diagnostic scanner to retrieve the specific fault code and conducting further testing to pinpoint the exact cause.

8. Can I reset OBDII code P25A2 in my 2018 GMC Sierra on my own?

While you can clear the code temporarily with an OBDII scanner, it is essential to address the underlying issue causing code P25A2 in your 2018 GMC Sierra to prevent it from reoccurring.

9. Is it expensive to repair OBDII code P25A2 in a 2018 GMC Sierra?

The cost of repairing OBDII code P25A2 in a 2018 GMC Sierra can vary depending on the root cause of the issue, so it's best to consult a mechanic for an accurate assessment.

10. Are there any DIY tips for addressing OBDII code P25A2 in a 2018 GMC Sierra?

While basic troubleshooting like checking for loose connections or damaged wiring may help, it is recommended to have a professional mechanic diagnose and repair OBDII code P25A2 in a 2018 GMC Sierra for optimal results.