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

Quick Answer

The P135D code for Chevrolet vehicles indicates that there is an issue with the Cooling Fan 2 Status Signals Message Counter being incorrect. Common causes include Faulty cooling fan control module: A malfunctioning cooling fan control module can disrupt the communication signals to the cooling fan, leading to the P135D code, Wiring issues: Damaged or corroded wiring connections between the ECM and cooling fan control module can cause signal disruptions and trigger the code, Faulty temperature sensor: A faulty temperature sensor may provide incorrect data to the ECM, leading to incorrect cooling fan operation. 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 Chevrolet indicates Cooling Fan 2 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan control module: A malfunctioning cooling fan control module can disrupt the communication signals to the cooling fan, leading to the P135D code, Wiring issues: Damaged or corroded wiring connections between the ECM and cooling fan control module can cause signal disruptions and trigger the code, Faulty temperature sensor: A faulty temperature sensor may provide incorrect data to the ECM, leading to incorrect cooling fan operation.
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 10, 2024
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Code P135D Chevrolet Description

The P135D code for Chevrolet vehicles indicates that there is an issue with the Cooling Fan 2 Status Signals Message Counter being incorrect. This means that the signal being sent to the cooling fan control module is not matching the expected values, which can result in the cooling fan not operating correctly. The cooling fan is an essential component of the vehicle's cooling system, responsible for regulating the temperature of the engine by dissipating heat. When the cooling fan does not function as it should, the engine may overheat, leading to potential damage and decreased performance.

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

Common Causes of P135D Chevrolet

  1. Faulty cooling fan control module: A malfunctioning cooling fan control module can disrupt the communication signals to the cooling fan, leading to the P135D code.
  2. Wiring issues: Damaged or corroded wiring connections between the ECM and cooling fan control module can cause signal disruptions and trigger the code.
  3. Faulty temperature sensor: A faulty temperature sensor may provide incorrect data to the ECM, leading to incorrect cooling fan operation.
  4. ECM malfunction: An issue with the engine control module (ECM) can also cause communication errors with the cooling fan control module, resulting in the P135D code.

Symptoms of P135D Chevrolet

  1. Engine overheating: One of the most common symptoms associated with this code is engine overheating, as the cooling fan may not be operating at the correct speed or not turning on at all.
  2. Increased engine temperature gauge readings: The temperature gauge on the dashboard may show higher than normal temperatures, indicating a potential issue with the cooling system.
  3. Poor air conditioning performance: The air conditioning performance may be affected, as the cooling fan plays a role in regulating the temperature of the air conditioning system.
  4. Engine performance issues: The engine may experience reduced performance or efficiency due to overheating caused by the malfunctioning cooling fan.

How to Fix P135D Chevrolet

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the P135D code and check the cooling fan system for any visible damage or issues.
  2. Check wiring and connections: Inspect the wiring connections between the ECM and cooling fan control module for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test cooling fan operation: Test the cooling fan operation by applying power directly to the fan to ensure it is functioning correctly. Replace the cooling fan if necessary.
  4. Replace faulty components: Replace any faulty components such as the cooling fan control module, temperature sensor, or ECM if they are found to be the root cause of the issue.
  5. Clear the code: Once the repairs are completed, clear the P135D code from the ECM using a diagnostic scanner to reset the system and ensure the issue has been resolved.

Cost to Fix P135D Chevrolet

The cost of repairing a P135D code for a Chevrolet vehicle can vary depending on the specific cause of the issue and the cost of parts and labor. On average, the repair costs for this issue can range from $200 to $500, including parts and labor. However, the actual cost may be higher or lower based on the extent of the repairs needed and the rates charged by the auto repair shop. It's recommended to consult with a professional mechanic or dealership for a more accurate estimate based on your vehicle's make and model. Remember that labor rates can vary significantly based on location and the type of repair facility.

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Information for Specific Chevrolet Models

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 Chevrolet Code

1. What does the OBDII code P135D indicate on a Chevrolet?

The P135D code on a Chevrolet signifies an issue with the "Cooling Fan 2 Status Signals Message Counter Incorrect." This means there is a discrepancy or fault in the communication regarding the status of the second cooling fan.

2. What symptoms might I notice if my Chevrolet has the P135D code?

Symptoms can include the engine overheating, the second cooling fan not operating properly, or possibly no noticeable symptoms at all apart from the check engine light being illuminated.

3. What are common causes of the P135D code in Chevrolets?

Common causes include faulty cooling fan relay, issues with the cooling fan motor, wiring problems affecting the fan circuit, or a malfunctioning engine control module (ECM).

4. How can I fix the P135D code on my Chevrolet?

To fix the P135D code, you should start by checking the cooling fan circuit for any damaged wires or poor connections. Replace the cooling fan relay or fan motor if they are defective. If the problem persists, it may be necessary to consult a professional to assess the ECM.

5. Is it safe to drive my Chevrolet with the P135D code active?

Driving with the P135D code can be risky if the cooling fan is malfunctioning, as it may lead to the engine overheating. It is advisable to address the issue promptly to avoid potential engine damage.

6. How can I diagnose the P135D code in my Chevrolet?

Diagnosing the P135D code involves using a scan tool to verify the code and observing the behavior of the cooling fan. Checking the electrical connections, wiring, and continuity in the fan circuit is crucial. Additionally, testing the fan motor and relay can help pinpoint the issue.

7. What tools are needed to diagnose and repair the P135D code?

You will need a digital multimeter for electrical testing, a scan tool to read and clear the code, and basic hand tools to access and replace components like the cooling fan relay or motor.

8. Could the P135D code indicate a problem elsewhere in the cooling system?

While P135D specifically relates to the fan’s status signal, underlying issues could be affecting the cooling system. It’s important to check the entire system, including the coolant levels, thermostat, and radiator, to ensure there are no additional problems causing the fan malfunction.

9. What preventive measures can be taken to avoid the P135D code on a Chevrolet?

Regular maintenance of the cooling system, including checking coolant levels, ensuring good electrical connections, and periodically testing the operation of the cooling fans, can help prevent issues related to code P135D.

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