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Engine-Codes – GMC – P25AF 2014 GMC Sierra

P25AF 2014 GMC Sierra Code - Coolant Temperature Control Module Requested MIL Illumination

Quick Answer

The P25AF diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to the Coolant Temperature Control Module Requested MIL Illumination. Common causes include Faulty coolant temperature control module, Wiring or connection issues, Malfunctioning ECM. 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
P25AF 2014 GMC Sierra indicates Coolant Temperature Control Module Requested MIL Illumination.
Common causes
Common causes include Faulty coolant temperature control module, Wiring or connection issues, Malfunctioning ECM.
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 18, 2024
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Code P25AF 2014 GMC Sierra Description

The P25AF diagnostic trouble code (DTC) for a 2014 GMC Sierra refers to the Coolant Temperature Control Module Requested MIL Illumination. This code indicates that the engine control module (ECM) has detected a fault related to the coolant temperature control module, which is responsible for monitoring and regulating the engine's coolant temperature. When this code is triggered, it means that the module has requested the malfunction indicator lamp (MIL) to illuminate on the vehicle's dashboard.

OBDII Code P25AF 2014 GMC Sierra - Coolant Temperature Control Module Requested MIL Illumination
P25AF 2014 GMC Sierra Code - Coolant Temperature Control Module Requested MIL Illumination

Common Causes of P25AF 2014 GMC Sierra

  1. Faulty coolant temperature control module
  2. Wiring or connection issues
  3. Malfunctioning ECM
  4. Problem with the coolant temperature sensor
  5. Low coolant levels

Symptoms of P25AF 2014 GMC Sierra

  1. Poor engine performance
  2. Reduced fuel efficiency
  3. Overheating
  4. Rough idling
  5. Potential stalling

How to Fix P25AF 2014 GMC Sierra

  1. Begin by conducting a thorough inspection of the coolant temperature control module, wiring, and connections for any visible damage or corrosion.
  2. Test the coolant temperature sensor to ensure it is functioning correctly and providing accurate readings to the ECM.
  3. If necessary, replace the coolant temperature control module with a new, OEM part to address any faults or malfunctions.
  4. Clear the DTC from the ECM's memory using a diagnostic scan tool and monitor the vehicle for any recurring issues.
  5. Perform a coolant flush and refill to ensure proper coolant levels and system operation.

Cost to Fix P25AF 2014 GMC Sierra

The typical repair costs for addressing the P25AF code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing the coolant temperature control module and conducting related repairs may range from $200 to $500, including parts and labor. 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. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It's recommended to obtain a detailed estimate from a qualified mechanic to determine the exact cost for repairing 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 P25AF 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P25AF in a 2014 GMC Sierra?

The common symptoms of code P25AF include the check engine light illuminating on the dashboard and potential issues with the vehicle's coolant temperature control system.

2. What causes the OBDII code P25AF to appear in a 2014 GMC Sierra?

The P25AF code is typically triggered when there is a malfunction in the coolant temperature control module, often due to electrical faults or sensor issues.

3. How serious is the OBDII code P25AF in a 2014 GMC Sierra?

While the vehicle may still be operable with the P25AF code present, it is important to address the underlying issue promptly to prevent potential damage to the coolant system and ensure optimal engine performance.

4. Can I continue driving my 2014 GMC Sierra with the P25AF code active?

It is generally not recommended to drive the vehicle with the P25AF code illuminated, as ignoring the issue could lead to overheating problems and other engine-related issues. It is best to have the vehicle diagnosed and repaired as soon as possible.

5. How is the OBDII code P25AF diagnosed in a 2014 GMC Sierra?

Diagnosing the P25AF code typically involves using an OBDII scanner to retrieve the specific fault code, followed by a thorough inspection of the coolant temperature control module and related components for any visible damage or malfunctions.

6. What are some repair tips for fixing the OBDII code P25AF in a 2014 GMC Sierra?

Repairing the P25AF code may involve repairing or replacing the coolant temperature control module, checking and repairing any wiring or connector issues, and resetting the fault code with an OBDII scanner after completing the repairs.

7. Can a DIY enthusiast fix the OBDII code P25AF issue in a 2014 GMC Sierra?

While some DIY enthusiasts may have the skills to address the P25AF code, it is recommended to consult a professional mechanic, especially if dealing with electrical components or complex diagnostic procedures.

8. How much does it cost to repair the OBDII code P25AF in a 2014 GMC Sierra?

The cost of repairing the P25AF code can vary depending on the underlying issue, parts needed for replacement, and labor costs. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.

9. Will resetting the OBDII code P25AF make it go away permanently?

Resetting the P25AF code with an OBDII scanner may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear once the system detects the fault again.

10. How can I prevent the OBDII code P25AF from reoccurring in my 2014 GMC Sierra?

To prevent the P25AF code from reoccurring, it is essential to regularly maintain the coolant temperature control system, address any overheating issues promptly, and follow the recommended service intervals for your vehicle.

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