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Engine-Codes – GMC – P25A2 2018 GMC Sierra

P25A2 2018 GMC Sierra Code - Brake System Control Module Requested MIL Illumination

Quick Answer

The P25A2 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Brake System Control Module (BSCM) has requested the Malfunction Indicator Lamp (MIL) to illuminate. Common causes include Faulty brake sensors, Wiring issues or electrical faults, Low brake fluid level. 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 Faulty brake sensors, Wiring issues or electrical faults, Low brake fluid level.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P25A2 2018 GMC Sierra Description

The P25A2 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Brake System Control Module (BSCM) has requested the Malfunction Indicator Lamp (MIL) to illuminate. This means that there is a fault detected in the brake system that requires attention. The BSCM is responsible for monitoring various aspects of the brake system, such as brake fluid level, brake pedal position, wheel speed sensors, and more. When a fault is detected, the BSCM triggers the MIL to alert the driver of the issue.

OBDII Code P25A2 2018 GMC Sierra - Brake System Control Module Requested MIL Illumination
P25A2 2018 GMC Sierra Code - Brake System Control Module Requested MIL Illumination

Common Causes of P25A2 2018 GMC Sierra

  1. Faulty brake sensors
  2. Wiring issues or electrical faults
  3. Low brake fluid level
  4. Malfunctioning Brake System Control Module (BSCM)
  5. Brake system hydraulic issues

Symptoms of P25A2 2018 GMC Sierra

  1. Illuminated Malfunction Indicator Lamp (MIL) on the dashboard
  2. Decreased braking performance
  3. ABS (Anti-lock Braking System) warning light may also illuminate
  4. Brake pedal may feel spongy or unresponsive
  5. Unusual noises coming from the brakes

How to Fix P25A2 2018 GMC Sierra

  1. Perform a diagnostic scan to retrieve the specific fault codes and identify the root cause of the issue.
  2. Inspect the brake system components, including sensors, wiring, and the BSCM, for any signs of damage or malfunction.
  3. Address any identified issues, such as replacing faulty sensors, repairing wiring, or recalibrating the BSCM.
  4. Clear the fault codes and reset the MIL to ensure that the issue has been resolved.
  5. Test drive the vehicle to verify that the brake system is functioning properly and that the warning lights have been extinguished.

Cost to Fix P25A2 2018 GMC Sierra

The typical repair costs for addressing a P25A2 DTC can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of parts and labor for this type of repair could range from $200 to $500. However, it's important to note that diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's recommended to check with local auto repair shops for a more accurate estimate of the costs involved in resolving this issue.

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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 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.

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