P135C 2015 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 2015 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC P135C 2015 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 2015 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 2015 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.
Need more information about the P135C 2015 GMC Sierra code?
Need more information on how to fix the P135C 2015 GMC Sierra code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P135C 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P135C 2015 GMC Sierra Code
1. What does the OBDII code P135C mean on a 2015 GMC Sierra?
The P135C code indicates that the engine control module (ECM) has detected an issue with the Cooling Fan 1 Status Signals Message Counter, meaning the ECM is not receiving proper data from the cooling fan module.
2. What are the symptoms of code P135C in a 2015 GMC Sierra?
Common symptoms include engine overheating, the cooling fan not functioning properly, the check engine light illuminating, and reduced engine performance.
3. What causes the P135C code on a 2015 GMC Sierra?
Possible causes include a faulty cooling fan module, damaged wiring or connectors in the cooling fan circuit, a software issue in the ECM, or communication errors between the fan module and ECM.
4. Can I still drive my 2015 GMC Sierra with the P135C code?
Driving with this code is not recommended, as it may lead to engine overheating and potential damage if the cooling fan is not operating correctly.
5. How can I diagnose the P135C code?
Diagnosis involves checking the cooling fan module and its wiring for damage, verifying communication signals with a scan tool, and ensuring the ECM is functioning correctly.
6. How do I fix the P135C code on a 2015 GMC Sierra?
Repairs may include replacing the cooling fan module, repairing or replacing damaged wiring or connectors, updating the ECM software, or clearing the code after resolving the issue.
7. How much does it cost to fix the P135C code on a 2015 GMC Sierra?
Repair costs can vary but typically range from $150 to $600, depending on whether the cooling fan module, wiring, or ECM needs repair or replacement.
8. Can a bad cooling fan relay cause the P135C code?
While the P135C code is specific to the fan module's signal, a faulty cooling fan relay can indirectly affect fan operation and should be inspected during diagnosis.
9. Will resetting the ECM clear the P135C code permanently?
Resetting the ECM may temporarily clear the code, but the underlying issue must be resolved to prevent the code from returning.
10. Is updating the ECM software necessary to fix the P135C code?
In some cases, a software update for the ECM may resolve communication issues with the cooling fan module and fix the P135C code.
Discuss the causes and fixes for P135C 2015 GMC Sierra OBDII Code
Code P135C 2015 GMC Sierra comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
