P135C 2016 GMC Sierra Code - Cooling Fan 1 Status Signals Message Counter Incorrect
Quick Answer
The diagnostic trouble code P135C for a 2016 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 prevent the fan from receiving the necessary signals to operate correctly, Defective cooling fan motor: A faulty cooling fan motor may not spin properly, leading to inadequate cooling of the engine, Wiring issues: Damaged or corroded wiring connections can disrupt the communication between the ECM and the cooling fan, causing the incorrect message counter. 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 2016 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 prevent the fan from receiving the necessary signals to operate correctly, Defective cooling fan motor: A faulty cooling fan motor may not spin properly, leading to inadequate cooling of the engine, Wiring issues: Damaged or corroded wiring connections can disrupt the communication between the ECM and the cooling fan, causing the incorrect message counter.
- 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 2016 GMC Sierra Description
The diagnostic trouble code P135C for a 2016 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. The cooling fan helps dissipate heat generated by the engine and prevents it from overheating. The cooling fan is controlled by the engine control module (ECM), which receives signals from various sensors to determine when the fan should be activated.
Common Causes of P135C 2016 GMC Sierra
- Faulty cooling fan relay: A malfunctioning cooling fan relay can prevent the fan from receiving the necessary signals to operate correctly.
- Defective cooling fan motor: A faulty cooling fan motor may not spin properly, leading to inadequate cooling of the engine.
- Wiring issues: Damaged or corroded wiring connections can disrupt the communication between the ECM and the cooling fan, causing the incorrect message counter.
- ECM software glitch: Occasionally, a software glitch in the engine control module can cause erroneous signals related to the cooling fan operation.
Symptoms of P135C 2016 GMC Sierra
- Engine overheating: One of the most common symptoms associated with this code is the engine overheating due to the cooling fan not operating correctly.
- Increased temperature gauge readings: The temperature gauge on the dashboard may show higher-than-normal readings, indicating a problem with the cooling system.
- Poor air conditioning performance: The cooling fan also helps cool the air conditioning condenser, so a malfunctioning fan can lead to reduced air conditioning performance.
- Check engine light: The illumination of the check engine light on the dashboard is a common indicator of issues with the cooling fan system.
How to Fix P135C 2016 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.
- Test cooling fan operation: Verify that the cooling fan is receiving the correct signals and is functioning as intended.
- Check wiring and connections: Inspect the wiring harness and connections for any damage or corrosion, repairing or replacing as necessary.
- Replace cooling fan relay or motor: If the relay or motor is found to be faulty, replace it with a new component to ensure proper cooling fan operation.
- Clear trouble codes: After completing the repair, clear the trouble codes from the ECM memory and test drive the vehicle to confirm that the issue has been resolved.
Cost to Fix P135C 2016 GMC Sierra
The cost of repairing a P135C code related to the Cooling Fan 1 Status Signals Message Counter on a 2016 GMC Sierra can vary depending on the specific cause of the issue. In general, the cost of parts such as a cooling fan relay or motor can range from $50 to $200, while labor costs may add an additional $100 to $300. Overall, the total repair cost for this issue could be between $150 and $500, but it's essential to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to inquire about these factors when seeking repairs.
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Frequently Asked Questions about P135C 2016 GMC Sierra Code
1. What does the OBDII code P135C mean on a 2016 GMC Sierra?
P135C indicates that the Cooling Fan 1 Status Signals Message Counter is incorrect, meaning the engine control module (ECM) is detecting a communication issue with the cooling fan system.
2. What are the common symptoms of code P135C in a 2016 GMC Sierra?
Symptoms may include the cooling fan not operating correctly, possible engine overheating, an illuminated check engine light, or reduced engine performance.
3. What causes code P135C to appear on a 2016 GMC Sierra?
The most common causes are wiring or connector issues in the cooling fan circuit, a faulty cooling fan control module, or a problem with the ECM.
4. Can a faulty cooling fan motor cause the P135C code?
While a faulty cooling fan motor is less common, it could indirectly contribute to this code if it causes irregular signals or communication errors.
5. How should I troubleshoot the P135C code on my 2016 GMC Sierra?
Start by inspecting the wiring and connectors for the cooling fan system, checking for loose connections, corrosion, or damage. If no issues are found, test the cooling fan control module and related circuits.
6. Can I drive my 2016 GMC Sierra with the P135C code?
It's not recommended, as the cooling fan may not function properly, potentially leading to engine overheating and further damage.
7. How much does it cost to fix the P135C code?
Repair costs vary depending on the issue, but it can range from $100 for minor wiring repairs to $500 or more for replacing the cooling fan control module.
8. Does the P135C code always mean the cooling fan control module is bad?
No, the issue could also be related to wiring, connectors, or the ECM. Proper diagnosis is necessary to identify the root cause.
9. Can a software update fix the P135C code on a 2016 GMC Sierra?
In some cases, a software update for the ECM may resolve communication issues, but this is less common. Consult with a dealership or qualified technician.
10. What tools are needed to diagnose the P135C code on a 2016 GMC Sierra?
You’ll need an OBDII scanner, a multimeter for electrical testing, and potentially a service manual with wiring diagrams for the cooling fan system.
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