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P135C 2015 Chevrolet Silverado Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Quick Answer

The P135C diagnostic trouble code (DTC) indicates an issue with the cooling fan system in the 2015 Chevrolet Silverado. Common causes include Faulty Cooling Fan Motor: A malfunctioning motor may fail to operate correctly, leading to incorrect signal messages, Wiring Issues: Damaged or corroded wiring and connectors can disrupt the communication between the cooling fan and the ECM, Defective Cooling Fan Relay: A relay that fails to engage can prevent the fan from receiving power when needed. 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
P135C 2015 Chevrolet Silverado indicates Cooling Fan 1 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty Cooling Fan Motor: A malfunctioning motor may fail to operate correctly, leading to incorrect signal messages, Wiring Issues: Damaged or corroded wiring and connectors can disrupt the communication between the cooling fan and the ECM, Defective Cooling Fan Relay: A relay that fails to engage can prevent the fan from receiving power when needed.
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 28, 2024
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Code P135C 2015 Chevrolet Silverado Description

The P135C diagnostic trouble code (DTC) indicates an issue with the cooling fan system in the 2015 Chevrolet Silverado. Specifically, this code refers to an incorrect message counter for the status signals of Cooling Fan 1. The cooling fan plays a crucial role in regulating engine temperature by drawing air through the radiator to dissipate heat generated during engine operation. When the Engine Control Module (ECM) detects a discrepancy in the expected signals from the cooling fan, it triggers this code.

OBDII Code P135C 2015 Chevrolet Silverado - Cooling Fan 1 Status Signals Message Counter Incorrect
P135C 2015 Chevrolet Silverado Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Common Causes of P135C 2015 Chevrolet Silverado

  1. Faulty Cooling Fan Motor: A malfunctioning motor may fail to operate correctly, leading to incorrect signal messages.
  2. Wiring Issues: Damaged or corroded wiring and connectors can disrupt the communication between the cooling fan and the ECM.
  3. Defective Cooling Fan Relay: A relay that fails to engage can prevent the fan from receiving power when needed.
  4. Software Glitch in ECM: An issue with the ECM's programming may lead to incorrect processing of fan status signals.
  5. Thermostat Malfunction: A stuck thermostat can cause the engine to overheat, affecting the cooling system's performance.

Symptoms of P135C 2015 Chevrolet Silverado

  1. Overheating Engine: The most critical symptom, as the engine temperature may rise beyond normal levels, potentially triggering the check engine light.
  2. Increased Fuel Consumption: An overheating engine can lead to inefficient fuel combustion, resulting in lower fuel economy.
  3. Erratic Cooling Fan Operation: The cooling fan may operate intermittently or not at all, leading to inconsistent engine cooling.
  4. Check Engine Light: The illumination of the check engine light on the dashboard is a common symptom associated with this code.
  5. Poor Engine Performance: Drivers may notice a decrease in overall engine performance, including sluggish acceleration and reduced power.

How to Fix P135C 2015 Chevrolet Silverado

  1. Diagnostic Scan: Begin with a comprehensive diagnostic scan to confirm the P135C code and check for any additional codes that may provide more context.
  2. Visual Inspection: Conduct a thorough visual inspection of the cooling fan assembly, wiring, and connectors for signs of damage or corrosion.
  3. Test Cooling Fan Operation: Manually test the cooling fan motor and relay to ensure they are functioning correctly. This may involve applying direct power to the fan to see if it operates.
  4. Check ECM Software: If no hardware issues are found, consider updating or reprogramming the ECM to resolve any potential software glitches.
  5. Replace Faulty Components: Based on the findings, replace any defective parts, such as the cooling fan motor, relay, or damaged wiring.

Cost to Fix P135C 2015 Chevrolet Silverado

The typical repair costs for addressing the P135C code can vary widely depending on the specific issue identified during diagnosis. On average, repairs may range from $150 to $600. This estimate includes parts such as a new cooling fan motor or relay, which can cost between $50 and $300, plus labor costs that can range from $80 to $150 per hour. It's important to note that labor rates can differ based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often charge less. Therefore, it is advisable to check local rates for a more precise estimate tailored to your specific situation.

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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 P135C 2015 Chevrolet Silverado Code

1. What does the OBDII code P135C mean on a 2015 Chevrolet Silverado?

The code P135C indicates that the Cooling Fan 1 status signal message counter is incorrect, meaning there’s a communication issue between the fan control module and the ECM.

2. What are the common symptoms of code P135C in a 2015 Silverado?

Symptoms may include the cooling fan not operating as expected, engine overheating, and possible check engine light illumination.

3. What causes the P135C code to appear in a 2015 Chevrolet Silverado?

Common causes include a faulty cooling fan module, wiring or connector issues, or a malfunctioning engine control module (ECM).

4. Can a faulty cooling fan trigger the P135C code?

Yes, a malfunctioning cooling fan or its control module can cause improper signals, triggering the P135C code.

5. How can I diagnose the P135C code on my Silverado?

Use a scan tool to confirm the code, inspect the cooling fan control module, and check the wiring and connectors for damage or corrosion.

6. Is it safe to drive with the P135C code active?

Driving with this code can cause engine overheating, which may lead to severe engine damage. It’s best to address the issue promptly.

7. How do I fix the P135C code on a 2015 Chevy Silverado?

Repairs may include replacing the cooling fan module, repairing damaged wires, cleaning connectors, or reprogramming the ECM if necessary.

8. Can a blown fuse cause the P135C code?

Yes, a blown fuse related to the cooling fan circuit can disrupt communication and trigger the P135C code.

9. Does the P135C code always mean the cooling fan is bad?

No, the issue could also be related to wiring, connectors, or the ECM. Proper diagnostics are necessary to pinpoint the root cause.

10. How much does it cost to repair the P135C code on a Silverado?

Repair costs vary depending on the issue but may range from $100 for wiring repairs to $500 or more if the cooling fan module needs replacement.

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