P135D 2015 GMC Sierra Code - Cooling Fan 2 Status Signals Message Counter Incorrect
Quick Answer
The diagnostic trouble code P135D for a 2015 GMC Sierra indicates that the Cooling Fan 2 Status Signals Message Counter is incorrect. Common causes include Faulty cooling fan: A malfunctioning cooling fan can send incorrect signals to the ECM, triggering the P135D code, Damaged wiring: Wiring issues, such as frayed or broken wires, can disrupt the communication between the cooling fan and the ECM, Malfunctioning ECM: A faulty ECM can misinterpret the signals from the cooling fan, leading to 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
- P135D 2015 GMC Sierra indicates Cooling Fan 2 Status Signals Message Counter Incorrect.
- Common causes
- Common causes include Faulty cooling fan: A malfunctioning cooling fan can send incorrect signals to the ECM, triggering the P135D code, Damaged wiring: Wiring issues, such as frayed or broken wires, can disrupt the communication between the cooling fan and the ECM, Malfunctioning ECM: A faulty ECM can misinterpret the signals from the cooling fan, leading to 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 P135D 2015 GMC Sierra Description
The diagnostic trouble code P135D for a 2015 GMC Sierra indicates that the Cooling Fan 2 Status Signals Message Counter is incorrect. This code typically means that the engine control module (ECM) is receiving an incorrect signal from the cooling fan 2, which can lead to issues with the vehicle's cooling system. The cooling fan plays a crucial role in maintaining the engine's optimal operating temperature by dissipating heat generated during the combustion process. If the cooling fan is not functioning properly, it can result in overheating, reduced engine performance, and potential damage to the engine.
Common Causes of P135D 2015 GMC Sierra
- Faulty cooling fan: A malfunctioning cooling fan can send incorrect signals to the ECM, triggering the P135D code.
- Damaged wiring: Wiring issues, such as frayed or broken wires, can disrupt the communication between the cooling fan and the ECM.
- Malfunctioning ECM: A faulty ECM can misinterpret the signals from the cooling fan, leading to the incorrect message counter.
- Cooling fan relay failure: A defective cooling fan relay can prevent the fan from turning on, causing the ECM to receive incorrect signals.
- Overheating: Continuous overheating of the engine can put stress on the cooling fan system, leading to potential malfunctions.
Symptoms of P135D 2015 GMC Sierra
- Engine overheating: The most common symptom associated with the P135D code is engine overheating, which can cause the vehicle to run hot and potentially lead to engine damage if not addressed.
- Check Engine Light: The illumination of the Check Engine Light is a common symptom of this code, indicating a problem with the cooling fan system.
- Reduced engine performance: If the cooling fan is not operating correctly, it can lead to reduced engine performance and efficiency.
- Loud noise from the cooling fan: A faulty cooling fan may produce unusual noises when in operation, signaling a potential issue with the fan motor or blades.
How to Fix P135D 2015 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 the cooling fan: Check the cooling fan for proper operation by running the engine and monitoring the fan's performance. Replace the fan if it is not functioning correctly.
- Inspect wiring: Check the wiring harness for any damage or loose connections that may be causing the incorrect signals. Repair or replace the wiring as needed.
- Replace the ECM: If the ECM is found to be faulty, it may need to be replaced to correct the issue with the cooling fan signals.
- Clear the trouble code: After completing the repairs, clear the trouble code from the ECM memory using a diagnostic scanner to reset the Check Engine Light and verify that the issue has been resolved.
Cost to Fix P135D 2015 GMC Sierra
The cost of repairing the P135D code on a 2015 GMC Sierra can vary depending on the specific cause of the issue and the extent of the repairs needed. In general, the cost of replacing a cooling fan can range from $200 to $500, while replacing an ECM can cost between $500 and $1000. Labor costs can range from $80 to $150 per hour, and the total repair cost can add up to $300 to $1500 or more. It is advisable to consult with a certified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle.
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Frequently Asked Questions about P135D 2015 GMC Sierra Code
1. What does the OBDII code P135D mean on a 2015 GMC Sierra?
P135D indicates an issue with the Cooling Fan 2 Status Signals Message Counter, meaning there is a communication error or mismatch in the signal data sent between the cooling fan control module and the engine control module (ECM).
2. What are the common symptoms of the P135D code?
Symptoms may include the cooling fan running continuously, the fan not operating when needed, engine overheating, or an illuminated check engine light.
3. What causes the P135D code on a 2015 GMC Sierra?
Common causes include faulty cooling fan control module, wiring or connector issues related to the fan circuit, or a software communication error between the control modules.
4. Can a bad cooling fan relay cause the P135D code?
Yes, a faulty cooling fan relay can disrupt proper communication and contribute to the P135D code if it affects the operation of Cooling Fan 2.
5. How is the P135D code diagnosed?
A technician will typically scan the vehicle for codes, inspect the cooling fan wiring and connectors, test the cooling fan control module, and verify communication signals between modules using specialized diagnostic tools.
6. Is it safe to drive with the P135D code?
Driving with this code may be unsafe if the cooling fan is not functioning properly, as it can lead to engine overheating and potential damage.
7. Can a software update fix the P135D code?
In some cases, a software update for the ECM or cooling fan control module may resolve communication issues causing the P135D code.
8. How do I fix the P135D code on my 2015 GMC Sierra?
Repairs may include replacing the cooling fan control module, repairing damaged wiring or connectors, updating module software, or replacing a faulty fan relay.
9. How much does it cost to repair the P135D code?
Repair costs can vary but may range from $150 to $500 depending on whether parts like the cooling fan control module or wiring need replacement.
10. Can a weak battery cause the P135D code?
A weak or failing battery can sometimes contribute to communication errors between modules, potentially triggering the P135D code.
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