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Engine-Codes – GMC – P135F 2018 GMC Sierra

P135F 2018 GMC Sierra Code - Cooling Fan 4 Status Signals Message Counter Incorrect

Quick Answer

The P135F diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Cooling Fan 4 Status Signals Message Counter is Incorrect. Common causes include Faulty cooling fan motor, Defective cooling fan relay, Wiring or connection issues in the cooling fan system. 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
P135F 2018 GMC Sierra indicates Cooling Fan 4 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan motor, Defective cooling fan relay, Wiring or connection issues in the cooling fan system.
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 17, 2024
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Code P135F 2018 GMC Sierra Description

The P135F diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates that the Cooling Fan 4 Status Signals Message Counter is Incorrect. This code is specifically related to the cooling fan system in the vehicle. The cooling fan plays a crucial role in maintaining the optimal operating temperature of the engine by dissipating excess heat generated during operation. When the cooling fan 4 status signals message counter is incorrect, it means that the signals being sent by the cooling fan system are not being properly received or interpreted by the vehicle's onboard computer.

OBDII Code P135F 2018 GMC Sierra - Cooling Fan 4 Status Signals Message Counter Incorrect
P135F 2018 GMC Sierra Code - Cooling Fan 4 Status Signals Message Counter Incorrect

Common Causes of P135F 2018 GMC Sierra

  1. Faulty cooling fan motor
  2. Defective cooling fan relay
  3. Wiring or connection issues in the cooling fan system
  4. Malfunctioning onboard computer
  5. Cooling fan blades obstructed or damaged

Symptoms of P135F 2018 GMC Sierra

  1. Engine overheating
  2. Reduced air conditioning performance
  3. Increased engine noise
  4. Check engine light illuminated
  5. Poor fuel economy

How to Fix P135F 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the cooling fan system, including the fan motor, relay, wiring, and connections.
  2. Test the cooling fan motor and relay for proper function using a multimeter to check for continuity and resistance.
  3. Inspect the cooling fan blades for any obstructions or damage that may be impeding their rotation.
  4. If necessary, replace the cooling fan motor, relay, or any damaged wiring or connections.
  5. Clear the DTC from the vehicle's onboard computer using a diagnostic scan tool to reset the system and ensure the issue has been resolved.

Cost to Fix P135F 2018 GMC Sierra

The typical repair costs for addressing a P135F code in a 2018 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a cooling fan motor or relay can cost between $150 and $300, while addressing wiring or connection issues may range from $100 to $200. Labor costs can add an additional $80 to $150 per hour, with the total repair bill potentially amounting to several hundred dollars. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of the vehicle.

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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 P135F 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P135F in a 2018 GMC Sierra?

Symptoms may include the cooling fan running continuously, engine overheating, poor vehicle performance, and possibly an illuminated check engine light.

2. What can cause the OBDII code P135F to appear in a 2018 GMC Sierra?

Potential causes may include a malfunctioning cooling fan, a faulty temperature sensor, wiring issues, or a problem with the engine control module (ECM).

3. How serious is the OBDII code P135F in a 2018 GMC Sierra?

Ignoring this code can lead to engine overheating and potential damage, so it is important to address the issue promptly to prevent costly repairs.

4. Can I continue driving my 2018 GMC Sierra with the P135F code?

It is not recommended to drive your vehicle with the P135F code present, as it can result in overheating and engine damage. It's best to have your vehicle inspected and repaired as soon as possible.

5. How can I diagnose the OBDII code P135F in my 2018 GMC Sierra?

Diagnosis typically involves using a scan tool to retrieve the code, checking the cooling fan operation, inspecting the temperature sensor, and examining the wiring for any faults.

6. What are some repair tips for addressing the P135F code in a 2018 GMC Sierra?

Repair tips may include replacing the cooling fan, replacing the temperature sensor, repairing any damaged wiring, or reprogramming the engine control module (ECM) if necessary.

7. Can a DIY enthusiast fix the OBDII code P135F in a 2018 GMC Sierra?

Depending on your mechanical skills and access to tools, some DIY enthusiasts may be able to address the issue themselves by following repair guides or consulting with a professional for guidance.

8. How much does it cost to repair the OBDII code P135F in a 2018 GMC Sierra?

Repair costs can vary depending on the specific cause of the code and whether you choose to DIY or take your vehicle to a mechanic. Costs may include parts and labor expenses.

9. Is the OBDII code P135F covered under warranty for a 2018 GMC Sierra?

If your vehicle is still under warranty, the repair for the P135F code may be covered depending on the warranty terms and conditions. It's advisable to check with your dealership for more information.

10. How can I prevent the OBDII code P135F from reoccurring in my 2018 GMC Sierra?

Regular maintenance, such as checking the cooling system components, ensuring proper fan operation, and addressing any warning signs promptly, can help prevent the code from reoccurring.

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