P135C 2017 GMC Sierra Code - Cooling Fan 1 Status Signals Message Counter Incorrect
Quick Answer
The diagnostic trouble code P135C for a 2017 GMC Sierra indicates that there is an issue with the Cooling Fan 1 Status Signals Message Counter being incorrect. Common causes include Faulty cooling fan relay: A malfunctioning cooling fan relay can disrupt the signals being sent to the cooling fan, triggering this code, Wiring issues: Corroded or damaged wiring connections related to the cooling fan can cause signal disruptions and lead to this code, Faulty cooling fan motor: If the cooling fan motor is failing or not functioning properly, it can result in incorrect signals being sent to the computer. 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 2017 GMC Sierra indicates Cooling Fan 1 Status Signals Message Counter Incorrect.
- Common causes
- Common causes include Faulty cooling fan relay: A malfunctioning cooling fan relay can disrupt the signals being sent to the cooling fan, triggering this code, Wiring issues: Corroded or damaged wiring connections related to the cooling fan can cause signal disruptions and lead to this code, Faulty cooling fan motor: If the cooling fan motor is failing or not functioning properly, it can result in incorrect signals being sent to the computer.
- 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.
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Code P135C 2017 GMC Sierra Description
The diagnostic trouble code P135C for a 2017 GMC Sierra indicates that there is an issue with the Cooling Fan 1 Status Signals Message Counter being incorrect. In modern vehicles, the cooling fan plays a crucial role in maintaining the engine's optimal operating temperature. When the engine reaches a certain temperature, the cooling fan is activated to help dissipate heat and prevent overheating. The Cooling Fan 1 Status Signals Message Counter is a part of the vehicle's onboard computer system that monitors the signals related to the cooling fan's operation.
Common Causes of P135C 2017 GMC Sierra
- Faulty cooling fan relay: A malfunctioning cooling fan relay can disrupt the signals being sent to the cooling fan, triggering this code.
- Wiring issues: Corroded or damaged wiring connections related to the cooling fan can cause signal disruptions and lead to this code.
- Faulty cooling fan motor: If the cooling fan motor is failing or not functioning properly, it can result in incorrect signals being sent to the computer.
- Defective cooling fan control module: The cooling fan control module may be faulty, causing issues with the signals being received by the computer.
Symptoms of P135C 2017 GMC Sierra
- Engine overheating: One of the most common symptoms associated with this code is the engine overheating due to the cooling fan not functioning properly.
- Increased engine temperature gauge readings: You may notice that the engine temperature gauge is showing higher than normal temperatures, indicating a potential issue with the cooling system.
- Poor air conditioning performance: The cooling fan also helps cool the air conditioning condenser, so if it's not working correctly, you may experience reduced cooling performance.
- Check Engine Light: The Check Engine Light may illuminate on the dashboard, indicating a problem that needs to be addressed.
How to Fix P135C 2017 GMC Sierra
- Diagnose the issue: Use a diagnostic scanner to retrieve the trouble code and perform a thorough inspection of the cooling fan system to identify the root cause of the problem.
- Check cooling fan relay: Test the cooling fan relay to ensure it is functioning correctly. Replace it if necessary.
- Inspect wiring: Check all wiring connections related to the cooling fan for any signs of damage or corrosion. Repair or replace any faulty wiring.
- Test cooling fan motor: Test the cooling fan motor to determine if it is operating as it should. Replace the motor if it is faulty.
- Check cooling fan control module: Inspect the cooling fan control module for any defects or malfunctions. Replace it if needed.
Cost to Fix P135C 2017 GMC Sierra
The cost of repairing the Cooling Fan 1 Status Signals Message Counter Incorrect issue can vary depending on the specific cause of the problem and the labor rates in your area. Generally, the cost of parts such as a cooling fan relay, wiring components, cooling fan motor, or control module can range from $50 to $200 each. The total repair cost, including parts and labor, can range from $150 to $500 or more. It's important to consult with a qualified mechanic to get an accurate estimate based on your vehicle's make and model, as well as the extent of the repairs needed. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can vary based on location and other factors.
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Frequently Asked Questions about P135C 2017 GMC Sierra Code
1. What does OBDII code P135C mean on a 2017 GMC Sierra?
P135C indicates an issue with the Cooling Fan 1 Status Signal, where the message counter sent from the cooling fan control module to the engine control module (ECM) is incorrect or not as expected.
2. What are the symptoms of code P135C in a 2017 GMC Sierra?
Common symptoms include the check engine light turning on, irregular cooling fan operation, potential engine overheating, or reduced engine performance.
3. What causes the P135C code to appear?
The code can be caused by a faulty cooling fan control module, wiring or connector issues, software glitches, or a malfunctioning engine control module (ECM).
4. Can I drive my 2017 GMC Sierra with the P135C code?
It’s not recommended to drive with this code for extended periods, as improper cooling fan operation can lead to engine overheating and potential engine damage.
5. How do I diagnose a P135C code on my GMC Sierra?
Start by inspecting the cooling fan control module, checking for damaged wiring or loose connections, and using a scan tool to monitor cooling fan operation and relevant signal data.
6. What are the most common fixes for a P135C code?
Common fixes include repairing or replacing damaged wiring or connectors, updating the ECM software, or replacing a faulty cooling fan control module.
7. How much does it cost to repair a P135C code on a 2017 GMC Sierra?
Repair costs vary but typically range from $100 to $400, depending on whether wiring repairs or module replacements are needed.
8. Can a bad cooling fan cause engine performance issues?
Yes, a malfunctioning cooling fan can lead to overheating, which may trigger the ECM to reduce engine performance as a protective measure.
9. Does the P135C code always indicate a hardware issue?
Not always. In some cases, it may be caused by a software glitch in the ECM or cooling fan control module that requires a software update.
10. How can I prevent the P135C code from recurring?
Regularly inspect and maintain the cooling system components, including the fan, wiring, and connectors, and ensure all software updates for the ECM are applied.
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