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Engine-Codes – Chevrolet – P135C 2018 Chevrolet Silverado

P135C 2018 Chevrolet Silverado Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Quick Answer

The P135C code indicates a malfunction related to the cooling fan system in the 2018 Chevrolet Silverado. Common causes include Faulty cooling fan motor that fails to operate or respond to commands, Damaged or corroded wiring and connectors in the cooling fan circuit, Malfunctioning cooling fan relay that fails to supply power to the fan. 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 2018 Chevrolet Silverado indicates Cooling Fan 1 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan motor that fails to operate or respond to commands, Damaged or corroded wiring and connectors in the cooling fan circuit, Malfunctioning cooling fan relay that fails to supply power to the fan.
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 27, 2024
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Code P135C 2018 Chevrolet Silverado Description

The P135C code indicates a malfunction related to the cooling fan system in the 2018 Chevrolet Silverado. Specifically, it refers to an incorrect message counter for the status signals of Cooling Fan 1. The cooling fan plays a crucial role in regulating the engine temperature by drawing air through the radiator to dissipate heat. When the Engine Control Module (ECM) detects that the expected number of status signals from the cooling fan does not match the actual count, it triggers this diagnostic trouble code (DTC).

OBDII Code P135C 2018 Chevrolet Silverado - Cooling Fan 1 Status Signals Message Counter Incorrect
P135C 2018 Chevrolet Silverado Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Common Causes of P135C 2018 Chevrolet Silverado

  1. Faulty cooling fan motor that fails to operate or respond to commands.
  2. Damaged or corroded wiring and connectors in the cooling fan circuit.
  3. Malfunctioning cooling fan relay that fails to supply power to the fan.
  4. Software issues or glitches within the Engine Control Module (ECM).
  5. Blocked or restricted airflow through the radiator, affecting fan operation.

Symptoms of P135C 2018 Chevrolet Silverado

  1. Engine overheating, especially during idling or low-speed driving.
  2. Increased engine temperature gauge readings on the dashboard.
  3. Unusual noises from the cooling fan area, such as grinding or whirring.
  4. Warning lights illuminated on the dashboard, including the check engine light.
  5. Reduced fuel efficiency due to the engine running hotter than normal.

How to Fix P135C 2018 Chevrolet Silverado

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the P135C code and check for any related codes that may provide additional context.
  2. Visual Inspection: Conduct a thorough visual inspection of the cooling fan wiring, connectors, and relay for any signs of damage, corrosion, or loose connections.
  3. Test Cooling Fan Operation: Manually test the cooling fan by applying direct power to it to ensure it operates correctly. If it does not, the fan may need to be replaced.
  4. Check Relay and ECM: Test the cooling fan relay for proper operation and inspect the ECM for any software updates or faults that may need addressing.
  5. Repair or Replace Components: Based on the findings, repair any damaged wiring, replace the cooling fan or relay as necessary, and clear the DTCs to see if the issue is resolved.

Cost to Fix P135C 2018 Chevrolet Silverado

The cost to repair the P135C code can vary widely based on the specific issue identified during diagnosis. On average, repairs may range from $100 to $600. This estimate includes parts such as a cooling fan motor (typically $100 to $300) and labor costs, which can range from $80 to $150 per hour. The total repair time may vary from 1 to 3 hours depending on the complexity of the issue. It's important to note that labor rates can differ significantly based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often offer more competitive pricing. For the most accurate estimate, it's advisable to consult local 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 P135C 2018 Chevrolet Silverado Code

1. What does the OBDII code P135C mean on a 2018 Chevrolet Silverado?

P135C indicates an issue with the cooling fan 1 status signals, specifically that the message counter information is incorrect or not being received as expected.

2. What are the symptoms of code P135C on a 2018 Chevrolet Silverado?

Symptoms may include the cooling fan not operating as intended, engine overheating, or an illuminated check engine light.

3. What causes the P135C code on a Chevrolet Silverado?

Common causes include a malfunctioning cooling fan control module, damaged wiring or connectors, or a communication issue between the engine control module (ECM) and the cooling fan.

4. Can P135C cause engine damage if left unaddressed?

Yes, if the cooling fan is not functioning properly, the engine could overheat, potentially leading to severe damage.

5. How do you diagnose the P135C code?

Diagnosis involves using a scan tool to check for related codes, inspecting the cooling fan system wiring and connectors, and testing the cooling fan control module.

6. Is a faulty cooling fan the only potential cause of P135C?

No, other potential causes include issues with the fan control module software, communication errors in the CAN bus system, or a faulty ECM.

7. Can you drive with code P135C on a 2018 Silverado?

It’s not recommended. Driving with a cooling fan issue could result in engine overheating, which may cause further damage.

8. How do you fix the P135C code on a 2018 Chevrolet Silverado?

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

9. How much does it cost to fix the P135C code?

Repair costs vary but could range from $100 to $500 depending on whether the issue is with the fan control module, wiring, or ECM programming.

10. Can a dead battery cause the P135C code to appear?

A dead or weak battery is unlikely to directly cause P135C, but electrical issues from a low voltage condition could contribute to communication errors in the cooling fan system.

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