P135C 2018 GMC Sierra Code - Cooling Fan 1 Status Signals Message Counter Incorrect
Quick Answer
Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Common causes include Faulty Cooling Fan 1, Cooling Fan 1 harness is open or shorted, Cooling Fan 1 circuit poor electrical connection. 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 Faulty Cooling Fan 1, Cooling Fan 1 harness is open or shorted, Cooling Fan 1 circuit poor electrical connection.
- 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.
Code P135C 2018 GMC Sierra Description
What are the Possible Causes of the DTC P135C 2018 GMC Sierra?
- Faulty Cooling Fan 1
- Cooling Fan 1 harness is open or shorted
- Cooling Fan 1 circuit poor electrical connection
How to Fix the DTC P135C 2018 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P135C 2018 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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.
Discuss the causes and fixes for P135C 2018 GMC Sierra OBDII Code
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