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P135F Cadillac Code - Cooling Fan 4 Status Signals Message Counter Incorrect

Quick Answer

The P135F diagnostic trouble code for Cadillac vehicles indicates that there is an issue with the Cooling Fan 4 Status Signals Message Counter being incorrect. Common causes include Faulty cooling fan control module, Faulty engine control module (ECM), Wiring issues or loose connections between the ECM and cooling fan 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
P135F Cadillac indicates Cooling Fan 4 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan control module, Faulty engine control module (ECM), Wiring issues or loose connections between the ECM and cooling fan 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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P135F Cadillac Description

The P135F diagnostic trouble code for Cadillac vehicles indicates that there is an issue with the Cooling Fan 4 Status Signals Message Counter being incorrect. This code typically points to a problem with the communication between the cooling fan control module and the engine control module (ECM). The cooling fan system plays a crucial role in regulating the engine's temperature by cooling down the radiator. When the cooling fan signals are not being properly received or processed, it can lead to overheating issues and potential damage to the engine.

OBDII Code P135F Cadillac - Cooling Fan 4 Status Signals Message Counter Incorrect
P135F Cadillac Code - Cooling Fan 4 Status Signals Message Counter Incorrect

Common Causes of P135F Cadillac

  1. Faulty cooling fan control module
  2. Faulty engine control module (ECM)
  3. Wiring issues or loose connections between the ECM and cooling fan control module
  4. Software issues with the ECM or cooling fan control module
  5. Electrical issues such as blown fuses or relays

Symptoms of P135F Cadillac

  1. Engine overheating
  2. Cooling fan not turning on when the engine is hot
  3. Check Engine Light illuminated
  4. Reduced engine performance
  5. Increased fuel consumption

How to Fix P135F Cadillac

  1. Begin by conducting a thorough inspection of the cooling fan control module, ECM, and wiring connections to identify any visible damage or loose connections.
  2. Test the cooling fan control module and ECM using a diagnostic tool to check for proper functionality.
  3. Check and replace any blown fuses or relays related to the cooling fan system.
  4. If necessary, reprogram the ECM or cooling fan control module to ensure proper communication between the two components.
  5. Clear the diagnostic trouble codes from the vehicle's system and test the cooling fan operation to verify that the issue has been resolved.

Cost to Fix P135F Cadillac

The typical repair costs for addressing the P135F code on a Cadillac vehicle can range from $200 to $500, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates. For a more accurate estimate, it is recommended to check with local auto repair shops.

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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 Cadillac Code

1. What are the common symptoms of OBDII code P135F in a Cadillac related to Cooling Fan 4 Status Signals Message Counter Incorrect?

- Common symptoms include the cooling fan not operating properly, engine overheating, and the vehicle possibly going into a reduced power mode.

2. What are the possible causes of OBDII code P135F in a Cadillac?

- The possible causes of this code include a faulty cooling fan, a malfunctioning cooling fan relay, wiring issues, or a problem with the engine control module (ECM).

3. How can I diagnose the issue causing OBDII code P135F in my Cadillac?

- You can diagnose the issue by checking the cooling fan operation, inspecting the wiring and connections related to the cooling fan, testing the cooling fan relay, and scanning the ECM for any related fault codes.

4. What are some repair tips for fixing OBDII code P135F in a Cadillac?

- Repair tips include checking and repairing any damaged wiring, replacing a faulty cooling fan or relay, ensuring proper connections, and resetting the ECM after repairs are made.

5. Can I drive my Cadillac with OBDII code P135F present?

- It is not recommended to drive your Cadillac with this code present, as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

6. Will resetting the ECM clear OBDII code P135F in a Cadillac?

- Resetting the ECM may temporarily clear the code, but if the underlying issue causing the code is not fixed, it is likely to return. It is important to diagnose and repair the root cause of the problem.

7. How much does it typically cost to repair OBDII code P135F in a Cadillac?

- The cost of repair can vary depending on the specific issue causing the code and the labor rates in your area. It is advisable to get a diagnostic done to determine the exact repair needed.

8. Can a DIY enthusiast fix OBDII code P135F in a Cadillac?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to address the issue causing this code. However, it is recommended to have the proper knowledge and experience when working on automotive electrical systems.

9. Is OBDII code P135F a common issue in Cadillac vehicles?

- While not extremely common, issues related to cooling fan malfunctions leading to this code can occur in Cadillac vehicles, especially in older models or vehicles with high mileage.

10. How urgent is it to address OBDII code P135F in a Cadillac?

- It is important to address this code promptly to avoid potential engine overheating and damage. Ignoring the issue can lead to more costly repairs in the future.

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