AutoCodes – GMC – P25AF 2017 GMC Sierra

P25AF 2017 GMC Sierra Code - Coolant Temperature 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 Coolant Temperature Control Module for codes, Faulty Coolant Temperature 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: P25AF 2017 GMC Sierra indicates Coolant Temperature Control Module Requested MIL Illumination.
Common causes: Common causes include Check Coolant Temperature Control Module for codes, Faulty Coolant Temperature 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 152

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 P25AF 2017 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 Coolant Temperature Control Module indicating that DTC has been set in the module.

OBDII Code P25AF 2017 GMC Sierra - Coolant Temperature Control Module Requested MIL Illumination - AutoCodes.com — P25AF 2017 GMC Sierra Code - Coolant Temperature Control Module Requested MIL Illumination

What does this mean?

What are the Possible Causes of the DTC P25AF 2017 GMC Sierra?

Check Coolant Temperature Control Module for codes
Faulty Coolant Temperature Control Module

How to Fix the DTC P25AF 2017 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 P25AF 2017 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 P25AF 2017 GMC Sierra code?

Need more information on how to fix the P25AF 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P25AF 2017 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 P25AF 2017 GMC Sierra Code

1. What are the common symptoms of OBDII code P25AF in a 2017 GMC Sierra?

The common symptoms of code P25AF may include the check engine light illuminating, engine overheating, poor fuel efficiency, and potential issues with the cooling system.

2. What does the OBDII code P25AF indicate in a 2017 GMC Sierra?

OBDII code P25AF in a 2017 GMC Sierra indicates a malfunction related to the Coolant Temperature Control Module Requested MIL Illumination.

3. What are the possible causes of OBDII code P25AF in a 2017 GMC Sierra?

Possible causes of code P25AF can include a faulty coolant temperature control module, wiring issues, a malfunctioning engine coolant temperature sensor, or a software problem.

4. How can I diagnose the OBDII code P25AF in my 2017 GMC Sierra?

Diagnosing code P25AF typically involves using an OBDII scanner to retrieve the trouble codes, inspecting the coolant temperature control module and related wiring, and testing the engine coolant temperature sensor.

5. Can I still drive my 2017 GMC Sierra with the OBDII code P25AF present?

It is not recommended to drive your GMC Sierra with the P25AF code present, as it may lead to engine overheating and potential damage. It's best to address the issue promptly.

6. How can I repair OBDII code P25AF in my 2017 GMC Sierra?

Repairing code P25AF may involve replacing the faulty coolant temperature control module, repairing any damaged wiring, replacing the engine coolant temperature sensor, or updating the module's software.

7. Will resetting the check engine light resolve the OBDII code P25AF in my 2017 GMC Sierra?

Simply resetting the check engine light will not resolve the underlying issue causing code P25AF. It's essential to diagnose and address the root cause of the problem.

8. Is it safe to ignore the OBDII code P25AF in my 2017 GMC Sierra?

Ignoring code P25AF can lead to potential engine overheating and other serious issues. It's crucial to address the problem promptly to prevent further damage.

9. Can a DIY enthusiast fix the OBDII code P25AF in a 2017 GMC Sierra?

While some aspects of diagnosing and repairing code P25AF may be DIY-friendly, it's recommended to seek professional help, especially when dealing with electronic modules and sensors.

10. How much does it cost to repair OBDII code P25AF in a 2017 GMC Sierra?

The cost of repairing code P25AF can vary depending on the exact cause of the issue, parts needed for replacement, and labor costs. It's advisable to obtain quotes from reputable mechanics or dealerships for an accurate estimate.