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Engine-Codes – GMC – P135C GMC

P135C GMC Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Quick Answer

The P135C code for GMC vehicles indicates that there is an issue with the Cooling Fan 1 Status Signals Message Counter being incorrect. Common causes include Faulty cooling fan motor: A malfunctioning cooling fan motor can lead to incorrect status signals being sent to the ECM, Defective cooling fan relay: If the cooling fan relay is faulty, it may not send the correct signals to the ECM, triggering this code, Wiring issues: Damaged or corroded wiring connections between the cooling fan, sensors, relay, and ECM can cause communication errors and trigger this code. 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 GMC indicates Cooling Fan 1 Status Signals Message Counter Incorrect.
Common causes
Common causes include Faulty cooling fan motor: A malfunctioning cooling fan motor can lead to incorrect status signals being sent to the ECM, Defective cooling fan relay: If the cooling fan relay is faulty, it may not send the correct signals to the ECM, triggering this code, Wiring issues: Damaged or corroded wiring connections between the cooling fan, sensors, relay, and ECM can cause communication errors and trigger this code.
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 09, 2024
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Code P135C GMC Description

The P135C code for GMC vehicles indicates that there is an issue with the Cooling Fan 1 Status Signals Message Counter being incorrect. The cooling fan plays a crucial role in regulating the temperature of the engine by dissipating heat generated during operation. When the message counter for the cooling fan status signals is incorrect, it can lead to a variety of problems that may affect the vehicle's performance and overall functionality.

OBDII Code P135C GMC - Cooling Fan 1 Status Signals Message Counter Incorrect
P135C GMC Code - Cooling Fan 1 Status Signals Message Counter Incorrect

Common Causes of P135C GMC

  1. Faulty cooling fan motor: A malfunctioning cooling fan motor can lead to incorrect status signals being sent to the ECM.
  2. Defective cooling fan relay: If the cooling fan relay is faulty, it may not send the correct signals to the ECM, triggering this code.
  3. Wiring issues: Damaged or corroded wiring connections between the cooling fan, sensors, relay, and ECM can cause communication errors and trigger this code.
  4. ECM malfunction: A problem with the Engine Control Module itself could result in incorrect message counters for the cooling fan status signals.

Symptoms of P135C GMC

  1. Engine overheating: One of the most common symptoms associated with this code is engine overheating. If the cooling fan is not functioning properly due to incorrect signals, the engine may overheat, leading to potential damage.
  2. Poor engine performance: The vehicle may experience a decrease in performance, such as reduced power and acceleration, due to the engine running at higher temperatures.
  3. Check Engine Light: The Check Engine Light may illuminate on the dashboard as a result of this code being triggered, indicating a problem with the cooling fan system.
  4. Increased fuel consumption: An inefficient cooling fan system can cause the engine to work harder, resulting in increased fuel consumption.

How to Fix P135C GMC

  1. Diagnose the issue: Use a diagnostic tool to retrieve the specific error codes and determine the root cause of the problem.
  2. Inspect cooling fan components: Check the cooling fan motor, relay, wiring connections, and sensors for any signs of damage or malfunction.
  3. Replace faulty components: Replace any defective cooling fan components, such as the motor, relay, or sensors, as needed.
  4. Reset ECM: Clear the error codes from the ECM and reset the system to ensure that the correct signals are being received.
  5. Test the cooling fan operation: After repairs have been made, test the cooling fan to ensure that it is functioning properly and sending accurate signals to the ECM.

Cost to Fix P135C GMC

The typical repair costs for addressing a P135C code related to the Cooling Fan 1 Status Signals Message Counter Incorrect can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the cost of parts for replacing a cooling fan motor, relay, or sensor can range from $50 to $200 or more, while the cost of labor can range from $100 to $300 or higher. Overall, the total repair cost for this issue may range from $150 to $500 or more, depending on the extent of the repairs needed. It is advisable to consult with a qualified mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of your vehicle. Keep in mind that diagnostic time and labor rates can vary, so it's essential to factor in these variables when estimating the total repair cost.

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Information for Specific GMC 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 P135C GMC Code

1. What are the common symptoms of OBDII code P135C GMC?

- The common symptoms of code P135C GMC include the cooling fan not operating properly, engine overheating, and the Check Engine Light illuminated on the dashboard.

2. What are the possible causes of OBDII code P135C GMC?

- Possible causes of code P135C GMC include a faulty cooling fan motor, damaged wiring or connectors in the cooling fan circuit, a defective cooling fan control module, or a malfunctioning engine control module (ECM).

3. How can I diagnose OBDII code P135C GMC?

- To diagnose code P135C GMC, you can start by visually inspecting the cooling fan and its components, checking the wiring and connectors for any visible damage, and using an OBDII scanner to retrieve specific diagnostic trouble codes.

4. Is it safe to drive with OBDII code P135C GMC active?

- It is not recommended to drive with code P135C GMC active, as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further complications.

5. How can I repair OBDII code P135C GMC?

- Repairing code P135C GMC may involve replacing the cooling fan motor, repairing or replacing damaged wiring or connectors, replacing the cooling fan control module, or reprogramming the engine control module (ECM) if necessary.

6. Can a DIY enthusiast fix OBDII code P135C GMC?

- Depending on your experience and access to tools, a DIY enthusiast may be able to address code P135C GMC by following repair guides, troubleshooting steps, and utilizing the appropriate replacement parts.

7. How much does it cost to repair OBDII code P135C GMC at a mechanic?

- The cost of repairing code P135C GMC at a mechanic can vary based on the specific diagnosis, parts needed, and labor rates. It is advisable to obtain quotes from multiple mechanics for an accurate estimate.

8. What other issues can arise if OBDII code P135C GMC is left untreated?

- If left untreated, code P135C GMC can lead to engine overheating, potential damage to the cooling system components, reduced engine performance, and even engine failure in severe cases.

9. Can resetting the OBDII system clear code P135C GMC?

- Resetting the OBDII system may temporarily clear code P135C GMC, but if the underlying issue is not addressed, the code is likely to reappear once the problem is detected again by the ECM.

10. How can I prevent OBDII code P135C GMC from recurring?

- To prevent code P135C GMC from recurring, it is essential to perform regular maintenance on the cooling system, address any cooling fan issues promptly, and follow recommended service intervals for your vehicle.

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