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P135F 2016 GMC Sierra Code - Cooling Fan 4 Status Signals Message Counter Incorrect

Quick Answer

The P135F diagnostic trouble code (DTC) indicates that there is an issue with the status signals from Cooling Fan 4 in a 2016 GMC Sierra. Common causes include Faulty Cooling Fan Relay: A malfunctioning relay can prevent the fan from receiving the proper signals from the ECM, Wiring Issues: Damaged or corroded wiring in the cooling fan circuit can lead to incorrect signals being sent to the ECM, Defective Cooling Fan: The fan itself may be faulty, causing it to operate intermittently or not at all. 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
P135F 2016 GMC Sierra indicates Cooling Fan 4 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty Cooling Fan Relay: A malfunctioning relay can prevent the fan from receiving the proper signals from the ECM, Wiring Issues: Damaged or corroded wiring in the cooling fan circuit can lead to incorrect signals being sent to the ECM, Defective Cooling Fan: The fan itself may be faulty, causing it to operate intermittently or not at all.
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 P135F 2016 GMC Sierra Description

The P135F diagnostic trouble code (DTC) indicates that there is an issue with the status signals from Cooling Fan 4 in a 2016 GMC Sierra. This code specifically points to an incorrect message counter, which suggests that the Engine Control Module (ECM) is receiving inconsistent or erroneous data regarding the operation of the cooling fan. The cooling fan is crucial for regulating engine temperature, and any malfunction can lead to overheating or inadequate cooling, potentially affecting engine performance and longevity.

OBDII Code P135F 2016 GMC Sierra - Cooling Fan 4 Status Signals Message Counter Incorrect
P135F 2016 GMC Sierra Code - Cooling Fan 4 Status Signals Message Counter Incorrect

Common Causes of P135F 2016 GMC Sierra

  1. Faulty Cooling Fan Relay: A malfunctioning relay can prevent the fan from receiving the proper signals from the ECM.
  2. Wiring Issues: Damaged or corroded wiring in the cooling fan circuit can lead to incorrect signals being sent to the ECM.
  3. Defective Cooling Fan: The fan itself may be faulty, causing it to operate intermittently or not at all.
  4. ECM Malfunction: A failure in the ECM can result in incorrect data processing and communication with the cooling fan system.
  5. Sensor Issues: Problems with temperature sensors that monitor engine temperature can lead to incorrect fan operation.

Symptoms of P135F 2016 GMC Sierra

  1. Check Engine Light: The illumination of the check engine light on the dashboard.
  2. Overheating: The engine temperature gauge may show higher than normal readings, indicating potential overheating.
  3. Poor Fuel Economy: A noticeable decrease in fuel efficiency due to the engine running hotter than optimal.
  4. Erratic Engine Performance: The vehicle may experience stalling, rough idling, or reduced power during acceleration.
  5. Unusual Noises: Hearing strange sounds from the engine bay, particularly when the cooling fan is supposed to be operating.

How to Fix P135F 2016 GMC Sierra

  1. Diagnostic Scan: Begin by using an OBD-II scanner to confirm the P135F 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 relay for signs of damage or corrosion.
  3. Test Cooling Fan: Manually test the cooling fan operation by applying direct power to ensure it functions correctly.
  4. Check Relay and Fuses: Test the cooling fan relay and associated fuses to ensure they are operational and replace any that are faulty.
  5. ECM Reprogramming or Replacement: If the ECM is determined to be the source of the problem, it may need to be reprogrammed or replaced to restore proper communication with the cooling fan system.

Cost to Fix P135F 2016 GMC Sierra

The typical repair costs for addressing a P135F code can vary widely based on the specific diagnosis and repair needed. On average, you might expect to pay between $150 and $600, which includes parts and labor. Simple fixes, such as replacing a relay or repairing wiring, may cost on the lower end, while more complex issues like ECM replacement can be on the higher end. It's important to note that diagnostic time and labor rates can differ based on location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour; however, rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. For a more precise estimate, it's advisable to check local rates and consult with a trusted mechanic.

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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 P135F 2016 GMC Sierra Code

1. What does the OBDII code P135F mean on a 2016 GMC Sierra?

P135F indicates an issue with the Cooling Fan 4 Status Signals Message Counter, where the signal communication between the fan module and the engine control module (ECM) is incorrect or inconsistent.

2. What are the common symptoms of the P135F code on a 2016 GMC Sierra?

Symptoms may include the check engine light turning on, cooling fan running at high speed continuously, engine overheating, or irregular fan operation.

3. What causes the P135F code to appear on a GMC Sierra?

The main causes include a faulty cooling fan module, wiring or connector issues, a malfunctioning engine control module (ECM), or software glitches in the communication system.

4. Can the P135F code cause engine damage if left unresolved?

Yes, unresolved cooling fan issues can lead to engine overheating, which may cause severe engine damage over time.

5. How do I diagnose the P135F code on my GMC Sierra?

Diagnose by using a scan tool to check for related codes, inspecting the cooling fan wiring and connectors, testing the fan module functionality, and verifying communication with the ECM.

6. Can a software update fix the P135F code?

In some cases, a software update for the ECM or cooling fan control module may resolve the issue if a glitch in the communication protocol is the root cause.

7. How much does it cost to repair the P135F code on a GMC Sierra?

Repair costs vary but may range from $50 for simple wiring repairs to $500 or more if the cooling fan module or ECM requires replacement.

8. Can I drive my GMC Sierra with the P135F code active?

Driving with this code is not recommended, as improper cooling fan operation can lead to overheating and potential engine damage.

9. What tools are needed to troubleshoot the P135F code?

A professional OBDII scan tool, multimeter, and possibly an oscilloscope are needed to diagnose communication or wiring issues accurately.

10. Is the P135F code a common issue on the 2016 GMC Sierra?

While not extremely common, this code can occur due to wear and tear on the cooling fan module or wiring over time, particularly in high-mileage or heavily used vehicles.

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