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P135D 2015 Chevrolet Silverado Code - Cooling Fan 2 Status Signals Message Counter Incorrect

Quick Answer

The P135D diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected an issue with the status signals from Cooling Fan 2. Common causes include Faulty cooling fan relay or control module, Damaged or corroded wiring or connectors in the cooling fan circuit, Malfunctioning temperature sensor that fails to provide accurate readings. 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 2015 Chevrolet Silverado indicates Cooling Fan 2 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan relay or control module, Damaged or corroded wiring or connectors in the cooling fan circuit, Malfunctioning temperature sensor that fails to provide accurate readings.
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 18, 2024
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Code P135D 2015 Chevrolet Silverado Description

The P135D diagnostic trouble code (DTC) indicates that the Engine Control Module (ECM) has detected an issue with the status signals from Cooling Fan 2. Specifically, this code suggests that the message counter for the cooling fan's operational status is incorrect, which can disrupt the communication between the ECM and the cooling fan control module. The cooling fans play a crucial role in maintaining optimal engine temperatures by regulating airflow through the radiator. When the ECM cannot accurately read the status of Cooling Fan 2, it may lead to improper fan operation, potentially causing the engine to overheat or not reach optimal operating temperatures.

OBDII Code P135D 2015 Chevrolet Silverado - Cooling Fan 2 Status Signals Message Counter Incorrect
P135D 2015 Chevrolet Silverado Code - Cooling Fan 2 Status Signals Message Counter Incorrect

Common Causes of P135D 2015 Chevrolet Silverado

  1. Faulty cooling fan relay or control module.
  2. Damaged or corroded wiring or connectors in the cooling fan circuit.
  3. Malfunctioning temperature sensor that fails to provide accurate readings.
  4. Software issues or glitches in the ECM that affect communication with the cooling fan system.
  5. Physical obstructions or mechanical failures within Cooling Fan 2 itself.

Symptoms of P135D 2015 Chevrolet Silverado

  1. Engine overheating during operation.
  2. Cooling fan running continuously or not at all.
  3. Erratic temperature gauge readings on the dashboard.
  4. Activation of the check engine light.
  5. Unusual noises from the cooling fan area, such as grinding or rattling.

How to Fix P135D 2015 Chevrolet Silverado

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the P135D code and check for any additional codes that may provide further insight into the issue.
  2. Visual Inspection: Conduct a thorough visual inspection of the cooling fan wiring, connectors, and relays for any signs of damage, corrosion, or loose connections.
  3. Test Cooling Fan Operation: Manually activate Cooling Fan 2 using a diagnostic tool to determine if the fan operates correctly. If it does not, further investigation into the fan motor and relay is necessary.
  4. Replace Faulty Components: If any faulty components are identified, such as the cooling fan relay or the fan motor, replace them with OEM or high-quality aftermarket parts.
  5. Reprogram or Update ECM: If the issue persists, consider reprogramming or updating the ECM software to ensure proper communication with the cooling fan system.

Cost to Fix P135D 2015 Chevrolet Silverado

The typical repair costs for addressing the P135D code can vary widely based on the specific diagnosis and repairs needed. On average, you might expect to pay between $150 and $600 for parts and labor combined. This estimate includes potential costs for replacing the cooling fan relay, wiring repairs, or even replacing the cooling fan itself. Labor rates at auto repair shops can range from $80 to $150 per hour, depending on the shop's location and reputation. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer lower rates. It's advisable to check local rates for a more precise estimate and to obtain quotes from multiple repair facilities to ensure you receive a fair price for the necessary repairs.

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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 2015 Chevrolet Silverado Code

1. What does the OBDII code P135D mean on a 2015 Chevrolet Silverado?

P135D indicates an issue with the Cooling Fan 2 Status Signals Message Counter being incorrect, which suggests a communication error between the fan control module and the engine control module (ECM).

2. What are the common symptoms of code P135D on a 2015 Chevrolet Silverado?

Common symptoms include the cooling fan not functioning properly, engine overheating, or an illuminated check engine light.

3. What causes the P135D code to appear on a 2015 Chevrolet Silverado?

Causes may include a faulty cooling fan control module, wiring or connector issues, or a malfunction in the ECM.

4. Can I continue driving my 2015 Chevrolet Silverado with the P135D code?

It’s not recommended to drive for extended periods, as improper cooling fan function can lead to engine overheating and potential damage.

5. How do I diagnose the P135D code on my 2015 Chevrolet Silverado?

Diagnosis involves checking the wiring and connectors for damage, testing the cooling fan control module, and using a scan tool to verify communication between the fan module and ECM.

6. How can I fix the P135D code on a 2015 Chevrolet Silverado?

Repairs may include replacing the cooling fan control module, repairing damaged wiring, or reprogramming/updating the ECM if needed.

7. Is the cooling fan control module a common failure point for the P135D code?

Yes, a faulty cooling fan control module is a common cause of this code and should be inspected during diagnosis.

8. Can a software update fix the P135D code on my 2015 Chevrolet Silverado?

In some cases, a software update or reprogramming of the ECM can resolve communication issues causing the P135D code.

9. How much does it cost to repair the P135D code on a 2015 Chevrolet Silverado?

Costs vary depending on the exact issue, but replacing a cooling fan control module typically ranges from $300 to $700, including parts and labor.

10. Can clearing the code fix the P135D issue?

Clearing the code may temporarily turn off the check engine light, but it won’t resolve the underlying issue causing the P135D code. Proper diagnosis and repair are necessary.

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