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P135D Cadillac Code - Cooling Fan 2 Status Signals Message Counter Incorrect

Quick Answer

The P135D diagnostic trouble code (DTC) indicates that there is an issue with the status signals from Cooling Fan 2 in a Cadillac vehicle. Common causes include Faulty cooling fan relay that fails to send the correct signals to the ECM, Damaged or corroded wiring and connectors in the cooling fan circuit, Malfunctioning cooling fan motor that does not respond to control signals. 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
P135D Cadillac indicates Cooling Fan 2 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan relay that fails to send the correct signals to the ECM, Damaged or corroded wiring and connectors in the cooling fan circuit, Malfunctioning cooling fan motor that does not respond to control signals.
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 Oct 21, 2024
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Code P135D Cadillac Description

The P135D diagnostic trouble code (DTC) indicates that there is an issue with the status signals from Cooling Fan 2 in a Cadillac vehicle. This code is typically triggered when the Engine Control Module (ECM) detects that the message counter for the cooling fan status signals is incorrect, suggesting a communication problem between the ECM and the cooling fan control module. The cooling fans are critical for regulating engine temperature, and any malfunction can lead to overheating or suboptimal engine performance.

OBDII Code P135D Cadillac - Cooling Fan 2 Status Signals Message Counter Incorrect
P135D Cadillac Code - Cooling Fan 2 Status Signals Message Counter Incorrect

Common Causes of P135D Cadillac

  1. Faulty cooling fan relay that fails to send the correct signals to the ECM.
  2. Damaged or corroded wiring and connectors in the cooling fan circuit.
  3. Malfunctioning cooling fan motor that does not respond to control signals.
  4. Issues within the ECM, such as software glitches or internal faults.
  5. Overheating due to other engine issues, which may affect the cooling system's performance.

Symptoms of P135D Cadillac

  1. Engine overheating, especially in stop-and-go traffic or during heavy acceleration.
  2. Inconsistent operation of the cooling fans, such as fans not turning on or off at the appropriate times.
  3. Reduced engine performance, potentially accompanied by a decrease in fuel efficiency.
  4. Illumination of the check engine light on the dashboard.
  5. Unusual noises from the cooling fan area, indicating a mechanical issue.

How to Fix P135D Cadillac

  1. Diagnostic Scan: Begin with a thorough diagnostic scan to confirm the P135D code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Conduct a visual inspection of the cooling fan wiring and connectors for any signs of damage, corrosion, or loose connections.
  3. Test Cooling Fan Relay: Test the cooling fan relay to ensure it is functioning correctly. Replace it if it is found to be faulty.
  4. Check Cooling Fan Operation: Manually activate the cooling fan to verify that it operates correctly. If it does not, the fan motor may need replacement.
  5. ECM Update/Replacement: If all other components are functioning properly, consider updating or replacing the ECM, as it may be the source of the communication error.

Cost to Fix P135D Cadillac

The cost to repair the P135D code can vary widely based on the specific issue identified during diagnosis. On average, repairs may range from $150 to $600, depending on whether it involves simple wiring repairs, relay replacements, or more complex ECM issues. Labor costs typically range from $80 to $150 per hour, and the total time required for diagnosis and repair can vary from 1 to 3 hours. Factors such as location, vehicle make and model, and engine type can significantly influence the final cost. It is advisable to check local labor rates and obtain multiple estimates for a more precise understanding of potential repair costs.

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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 P135D Cadillac Code

1. What are the common symptoms of OBDII code P135D in a Cadillac related to the Cooling Fan 2 Status Signals Message Counter Incorrect?

- Common symptoms include the cooling fan not working properly, engine overheating, and the check engine light coming on.

2. What are the possible causes of OBDII code P135D in a Cadillac?

- Possible causes may include a faulty cooling fan, a malfunctioning fan relay, wiring issues, or a problem with the engine control module (ECM).

3. How can I diagnose the issue related to OBDII code P135D in a Cadillac?

- To diagnose the issue, you can start by checking the cooling fan operation, inspecting the fan relay, testing the wiring connections, and scanning the ECM for error codes.

4. Is it safe to continue driving with OBDII code P135D in a Cadillac?

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

5. Can I repair OBDII code P135D in a Cadillac on my own?

- Depending on your skills and knowledge, you may be able to repair this issue on your own by replacing the cooling fan, fixing wiring problems, or resetting the ECM.

6. How much does it typically cost to fix OBDII code P135D in a Cadillac?

- The cost of repairs can vary depending on the specific issue, but it may range from $100 to $500, including parts and labor.

7. What are some preventive maintenance tips to avoid OBDII code P135D in a Cadillac?

- Regularly inspecting the cooling system, checking the fan operation, and addressing any warning signs promptly can help prevent this code from occurring.

8. Can extreme weather conditions affect the likelihood of encountering OBDII code P135D in a Cadillac?

- Yes, extreme heat or cold can put additional stress on the cooling system components, potentially leading to issues like the one indicated by this code.

9. How long does it typically take to repair OBDII code P135D in a Cadillac?

- The repair time can vary based on the exact cause of the issue, but it may take anywhere from 1 to 3 hours to diagnose and fix the problem.

10. Are there any recalls or technical service bulletins related to OBDII code P135D in Cadillac vehicles?

- It is advisable to check with a Cadillac dealership or online resources for any relevant recalls or technical service bulletins related to this specific OBDII code to stay informed about potential manufacturer-acknowledged issues.

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