P135C 2018 GMC Sierra Code - Cooling Fan 1 Status Signals Message Counter Incorrect
Quick Answer
The diagnostic trouble code P135C for a 2018 GMC Sierra indicates that there is an issue with the Cooling Fan 1 Status Signals Message Counter being incorrect. Common causes include Malfunctioning cooling fan, Faulty wiring in the cooling fan circuit, Defective coolant temperature sensor. 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 GMC Sierra indicates Cooling Fan 1 Status Signals Message Counter Incorrect.
- Common causes
- Common causes include Malfunctioning cooling fan, Faulty wiring in the cooling fan circuit, Defective coolant temperature sensor.
- 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 2018 GMC Sierra Description
The diagnostic trouble code P135C for a 2018 GMC Sierra indicates that there is an issue with the Cooling Fan 1 Status Signals Message Counter being incorrect. This means that the signal being sent by the cooling fan system is not matching the expected parameters, leading to potential cooling system malfunctions. The cooling fan plays a crucial role in regulating the engine temperature by dissipating heat generated during the combustion process. If the cooling fan is not functioning properly, it can lead to overheating, which can cause severe engine damage and ultimately result in a breakdown.
Common Causes of P135C 2018 GMC Sierra
- Malfunctioning cooling fan
- Faulty wiring in the cooling fan circuit
- Defective coolant temperature sensor
- Issues with the engine control module (ECM)
- Electrical issues such as blown fuses or relays
Symptoms of P135C 2018 GMC Sierra
- Engine overheating
- Reduced fuel efficiency
- Loss of power
- Illumination of the check engine light
- Potential engine misfires or stalling
How to Fix P135C 2018 GMC Sierra
- Begin by performing a comprehensive diagnosis of the cooling fan system to determine the exact cause of the issue.
- Check the cooling fan for proper operation and replace it if necessary.
- Inspect the wiring in the cooling fan circuit for any damage or loose connections and repair as needed.
- Test the coolant temperature sensor for proper functionality and replace it if it is faulty.
- If the issue persists, check the engine control module (ECM) for any malfunctions and address any issues found.
Cost to Fix P135C 2018 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. In general, replacing a cooling fan can cost between $200 to $500, while repairing wiring or replacing a coolant temperature sensor can range from $100 to $300. The total repair cost, including parts and labor, could amount to anywhere from $300 to $800. However, it is essential to note that labor rates at auto repair shops can vary, so it is advisable to check with local shops for a more accurate estimate.
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Frequently Asked Questions about P135C 2018 GMC Sierra Code
1. What does the OBDII code P135C mean on a 2018 GMC Sierra?
P135C indicates that the Cooling Fan 1 status signal message counter is incorrect, suggesting a communication issue between the cooling fan control module and the engine control module (ECM).
2. What are common symptoms of the P135C code on a 2018 GMC Sierra?
Symptoms may include the cooling fan not operating as expected, engine overheating, or the check engine light being illuminated.
3. What causes the P135C code on a 2018 GMC Sierra?
Common causes include a faulty cooling fan control module, wiring or connector issues, or a software glitch in the ECM.
4. Can I still drive my 2018 GMC Sierra with the P135C code active?
Driving with this code is not recommended, as improper cooling fan operation can lead to engine overheating and potential damage.
5. How do I diagnose the P135C code on a 2018 GMC Sierra?
Diagnosis typically involves checking for wiring and connector issues, testing the cooling fan control module, and verifying communication signals between the ECM and the fan module.
6. What tools are needed to troubleshoot the P135C code?
A scan tool capable of reading live data and manufacturer-specific codes, a multimeter for electrical testing, and wiring diagrams for the cooling system are essential.
7. How is the P135C code fixed on a 2018 GMC Sierra?
Repairs may include replacing the cooling fan control module, repairing damaged wiring or connectors, or updating the ECM software if a glitch is found.
8. How much does it cost to fix the P135C code on a 2018 GMC Sierra?
Repair costs can range from $100 to $500, depending on whether the issue is a simple wiring repair or requires replacing the cooling fan control module.
9. Can a dead cooling fan cause the P135C code?
Yes, a cooling fan that is completely non-functional can trigger this code if it disrupts communication with the ECM.
10. Will clearing the P135C code fix the issue permanently?
Clearing the code without addressing the underlying problem will not permanently fix it, and the code is likely to return.
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