AutoCodes – GMC – P135C 2017 GMC Sierra

P135C 2017 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 2017 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 153

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 27, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P135C 2017 GMC Sierra Description

Control modules connected to the serial data circuits monitor the communication during normal vehicle operation. Operating information and commands are exchanged among the control modules. Each module on the serial data circuit maintains a transmit error counter and a receive error counter. The counter values increase with detected errors and decrease with error-free messages. The Diagnostic Trouble Code (DTC) will be set when the Cooling Fan 1 Status Signals Message Counter is Incorrect.

OBDII Code P135C 2017 GMC Sierra - Cooling Fan 1 Status Signals Message Counter Incorrect - AutoCodes.com — P135C 2017 GMC Sierra Code - Cooling Fan 1 Status Signals Message Counter Incorrect

What does this mean?

What are the Possible Causes of the DTC P135C 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the P135C 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P135C 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 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?

Itâ€™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.