P135D 2016 GMC Sierra Code - Cooling Fan 2 Status Signals Message Counter Incorrect
Quick Answer
The diagnostic trouble code P135D for a 2016 GMC Sierra indicates that the Cooling Fan 2 Status Signals Message Counter is incorrect. Common causes include Faulty cooling fan motor: The cooling fan motor may fail over time, leading to improper operation of the cooling fan, Defective cooling fan relay: A faulty relay can prevent the cooling fan from receiving the necessary signals to operate correctly, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of signals between components, causing errors in the cooling fan system. 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 2016 GMC Sierra indicates Cooling Fan 2 Status Signals Message Counter Incorrect.
- Common causes
- Common causes include Faulty cooling fan motor: The cooling fan motor may fail over time, leading to improper operation of the cooling fan, Defective cooling fan relay: A faulty relay can prevent the cooling fan from receiving the necessary signals to operate correctly, Wiring issues: Damaged or corroded wiring connections can disrupt the flow of signals between components, causing errors in the cooling fan system.
- 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 2016 GMC Sierra Description
The diagnostic trouble code P135D for a 2016 GMC Sierra indicates that the Cooling Fan 2 Status Signals Message Counter is incorrect. In modern vehicles, the cooling fan plays a crucial role in maintaining the optimal operating temperature of the engine. The cooling fan helps dissipate heat generated by the engine during operation, preventing overheating and ensuring efficient performance. When the ECM (Engine Control Module) detects that the signals related to the status of Cooling Fan 2 are not matching the expected values, it triggers this diagnostic trouble code.
Common Causes of P135D 2016 GMC Sierra
- Faulty cooling fan motor: The cooling fan motor may fail over time, leading to improper operation of the cooling fan.
- Defective cooling fan relay: A faulty relay can prevent the cooling fan from receiving the necessary signals to operate correctly.
- Wiring issues: Damaged or corroded wiring connections can disrupt the flow of signals between components, causing errors in the cooling fan system.
- ECM malfunction: A malfunctioning ECM can misinterpret signals related to the cooling fan, triggering the incorrect message counter code.
Symptoms of P135D 2016 GMC Sierra
- Engine overheating: One of the most common symptoms associated with this code is engine overheating. If the cooling fan is not operating correctly, the engine may not receive adequate cooling, leading to overheating.
- Reduced engine performance: A malfunctioning cooling fan can cause the engine to run hotter than normal, resulting in reduced performance and efficiency.
- Illuminated Check Engine Light: The ECM will trigger the Check Engine Light when it detects an issue with the cooling fan system, including incorrect signals from Cooling Fan 2.
- Unusual engine noises: In some cases, a malfunctioning cooling fan may produce unusual noises, such as grinding or squealing, indicating a problem that needs attention.
How to Fix P135D 2016 GMC Sierra
- Diagnose the issue: Begin by using a diagnostic scanner to retrieve the trouble codes and perform a thorough inspection of the cooling fan system to identify the specific cause of the problem.
- Test cooling fan operation: Verify the operation of Cooling Fan 2 by checking for power and ground signals, as well as testing the fan motor itself to ensure proper functionality.
- Replace faulty components: If a faulty cooling fan motor, relay, or wiring is identified as the cause, replace the defective components with new ones to restore proper operation.
- Clear trouble codes: After completing the repair, clear the trouble codes stored in the ECM to reset the system and ensure that the issue has been resolved.
- Test drive: Take the vehicle for a test drive to confirm that the cooling fan system is functioning correctly and that the code does not reappear.
Cost to Fix P135D 2016 GMC Sierra
The typical repair costs for addressing a P135D code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the cost of replacement parts. In general, the cost of replacing a cooling fan motor, relay, or wiring can range from $200 to $500, including parts and labor. Additional diagnostic fees and labor costs may apply, with total repair costs potentially exceeding $500 in some cases. It's important to note that labor rates at auto repair shops can vary significantly, so it's advisable to obtain quotes from multiple providers to ensure a competitive price.
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Frequently Asked Questions about P135D 2016 GMC Sierra Code
1. What does OBDII code P135D mean on a 2016 GMC Sierra?
Code P135D indicates that the Cooling Fan 2 status signals message counter is incorrect, which means there’s a communication issue between the fan control module and the engine control module (ECM).
2. What are the common symptoms of code P135D in a 2016 GMC Sierra?
Symptoms may include an illuminated check engine light, cooling fan malfunction (running constantly or not at all), potential engine overheating, or reduced air conditioning performance.
3. What causes code P135D in a 2016 GMC Sierra?
Common causes include a faulty cooling fan control module, damaged or corroded wiring and connectors, a malfunctioning ECM, or software issues in the vehicle’s control systems.
4. Can code P135D cause engine overheating in a 2016 GMC Sierra?
Yes, if Cooling Fan 2 is not functioning correctly due to the communication issue, it can lead to inadequate engine cooling and potential overheating.
5. How do I diagnose code P135D on a 2016 GMC Sierra?
Diagnosis involves scanning for additional trouble codes, inspecting the cooling fan wiring and connectors for damage, testing the cooling fan control module, and verifying communication between the ECM and the fan module.
6. Can I drive my 2016 GMC Sierra with code P135D?
It’s not recommended to drive for long periods, as the cooling fan may not operate properly, increasing the risk of engine overheating or performance issues.
7. How is code P135D fixed on a 2016 GMC Sierra?
Repairs may involve replacing the cooling fan control module, repairing or replacing damaged wiring or connectors, or updating/reprogramming the ECM software.
8. How much does it cost to repair code P135D on a 2016 GMC Sierra?
Repair costs can vary. Replacing the cooling fan control module may cost $300-$600, while wiring repairs could cost less. ECM reprogramming typically costs $100-$200.
9. Can a dead battery cause code P135D in a 2016 GMC Sierra?
A dead or weak battery is unlikely to directly cause P135D, but low voltage during startup could contribute to communication errors. Ensure the battery is fully charged and in good condition.
10. Is a software update required to fix code P135D on a 2016 GMC Sierra?
In some cases, a software update for the ECM or cooling fan control module may resolve the communication issue, particularly if the problem is related to a known software bug.
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