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P25AF 2018 GMC Sierra Code - Coolant Temperature Control Module Requested MIL Illumination

Quick Answer

The P25AF diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to the Coolant Temperature Control Module Requested MIL Illumination. Common causes include Faulty coolant temperature control module, Wiring or electrical connection issues, Coolant temperature sensor malfunction. 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 2018 GMC Sierra indicates Coolant Temperature Control Module Requested MIL Illumination.
Common causes
Common causes include Faulty coolant temperature control module, Wiring or electrical connection issues, Coolant temperature sensor malfunction.
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 2018 GMC Sierra Description

The P25AF diagnostic trouble code (DTC) for a 2018 GMC Sierra refers to the Coolant Temperature Control Module Requested MIL Illumination. This code indicates that the engine control module (ECM) has detected an issue with the coolant temperature control module, which is responsible for regulating the engine's operating temperature. When this code is triggered, it means that the coolant temperature control module has requested the malfunction indicator lamp (MIL) to illuminate on the vehicle's dashboard.

OBDII Code P25AF 2018 GMC Sierra - Coolant Temperature Control Module Requested MIL Illumination
P25AF 2018 GMC Sierra Code - Coolant Temperature Control Module Requested MIL Illumination

Common Causes of P25AF 2018 GMC Sierra

  1. Faulty coolant temperature control module
  2. Wiring or electrical connection issues
  3. Coolant temperature sensor malfunction
  4. Cooling system leaks or blockages
  5. ECM software or programming issues

Symptoms of P25AF 2018 GMC Sierra

  1. Illumination of the check engine light on the dashboard
  2. Fluctuating engine temperature gauge readings
  3. Engine overheating or running too cold
  4. Decreased fuel efficiency
  5. Engine performance issues such as rough idling or stalling

How to Fix P25AF 2018 GMC Sierra

  1. Diagnose the specific cause of the P25AF code using a diagnostic scanner to pinpoint the issue with the coolant temperature control module.
  2. Inspect the coolant temperature control module, wiring, and connections for any signs of damage or corrosion.
  3. Test the coolant temperature sensor to ensure it is functioning correctly.
  4. Check the cooling system for leaks or blockages that could be affecting the engine's temperature regulation.
  5. If necessary, replace the faulty coolant temperature control module, repair any wiring issues, and clear the DTC from the ECM.

Cost to Fix P25AF 2018 GMC Sierra

The typical repair costs for addressing a P25AF code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty coolant temperature control module can cost between $200 and $500, including parts and labor. However, additional costs may apply if there are other underlying issues that need to be addressed. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

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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 2018 GMC Sierra Code

1. What are common symptoms of OBDII code P25AF in a 2018 GMC Sierra?

- Common symptoms include the Check Engine Light coming on, engine overheating, and potential issues with the cooling system.

2. What does the OBDII code P25AF indicate in a 2018 GMC Sierra?

- The code P25AF indicates a fault related to the Coolant Temperature Control Module Requested MIL Illumination in the vehicle.

3. What are possible causes of the P25AF code in a 2018 GMC Sierra?

- Possible causes include a malfunctioning coolant temperature control module, wiring issues, a faulty temperature sensor, or a problem within the cooling system.

4. How can I diagnose the P25AF code in my 2018 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific code, checking the coolant temperature sensor, inspecting the wiring connections, and testing the coolant temperature control module.

5. Can I still drive my 2018 GMC Sierra with the P25AF code?

- It is not recommended to drive the vehicle with the P25AF code present, as it may lead to engine overheating and potential damage. It is best to address the issue promptly.

6. How can I repair the P25AF code in my 2018 GMC Sierra?

- Repair options may include replacing the coolant temperature control module, repairing any wiring issues, replacing the temperature sensor, or addressing any cooling system problems identified during diagnosis.

7. Is it safe to clear the P25AF code with an OBDII scanner?

- Clearing the code may temporarily turn off the Check Engine Light, but it is essential to address the underlying issue causing the code to prevent further problems with the vehicle.

8. Will the P25AF code affect the performance of my 2018 GMC Sierra?

- The P25AF code can potentially affect the performance of the vehicle, especially if it leads to engine overheating or cooling system malfunctions. It is advisable to address the issue promptly.

9. Can a DIY enthusiast repair the P25AF code in a 2018 GMC Sierra?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the P25AF code by following repair guides and procedures specific to the GMC Sierra model.

10. How much does it cost to repair the P25AF code in a 2018 GMC Sierra?

- The cost of repairing the P25AF code can vary depending on the specific issue causing the code, the parts needed for repair, and whether the repair is done at a dealership, independent mechanic, or DIY. It is advisable to obtain quotes from different sources for an accurate estimate.

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