P135C 2015 GMC Sierra Code - Cooling Fan 1 Status Signals Message Counter Incorrect
Quick Answer
The P135C code indicates a malfunction in the communication between the Engine Control Module (ECM) and the cooling fan control module, specifically regarding the status signals for Cooling Fan 1. Common causes include Faulty cooling fan relay or module, Damaged or corroded wiring/connectors in the cooling fan circuit, Malfunctioning Engine Control Module (ECM). 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 relay or module, Damaged or corroded wiring/connectors in the cooling fan circuit, Malfunctioning Engine Control Module (ECM).
- 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 2015 GMC Sierra Description
The P135C code indicates a malfunction in the communication between the Engine Control Module (ECM) and the cooling fan control module, specifically regarding the status signals for Cooling Fan 1. This code typically arises when the ECM detects an inconsistency in the expected message count from the cooling fan module. The cooling fans play a critical role in regulating engine temperature by drawing air through the radiator, ensuring optimal engine performance and preventing overheating. When the ECM receives incorrect or unexpected signals, it may lead to improper fan operation, which can cause the engine to run hotter than normal, potentially resulting in overheating, reduced fuel efficiency, and increased emissions.
Common Causes of P135C 2015 GMC Sierra
- Faulty cooling fan relay or module.
- Damaged or corroded wiring/connectors in the cooling fan circuit.
- Malfunctioning Engine Control Module (ECM).
- Incorrectly calibrated or defective temperature sensors.
- Software issues or glitches in the vehicle's onboard computer system.
Symptoms of P135C 2015 GMC Sierra
- Engine overheating, especially during heavy load or high ambient temperatures.
- Erratic or non-functioning cooling fan operation.
- Increased engine temperature gauge readings.
- Reduced fuel efficiency due to improper engine cooling.
- Activation of the check engine light on the dashboard.
How to Fix P135C 2015 GMC Sierra
- Diagnostic Scan: Begin by using an OBD-II scanner to confirm the P135C code and check for any additional codes that may provide further insight into the issue.
- Visual Inspection: Conduct a thorough inspection of the wiring and connectors related to Cooling Fan 1 for signs of damage, corrosion, or loose connections.
- Test Cooling Fan Relay: Use a multimeter to test the cooling fan relay for proper operation. Replace it if it is found to be faulty.
- Check ECM and Sensors: Inspect the Engine Control Module and associated temperature sensors for proper function. Update or reprogram the ECM if necessary.
- Clear Codes and Test Drive: After repairs, clear the diagnostic codes and perform a test drive to ensure that the cooling fan operates correctly and that the P135C code does not reappear.
Cost to Fix P135C 2015 GMC Sierra
The typical repair costs for addressing the P135C code can vary widely depending on the specific cause of the issue. On average, the cost may range from $150 to $600. This estimate includes parts such as a cooling fan relay or module, which can cost between $50 and $200, and labor costs that typically range from $80 to $150 per hour. The total time for diagnosis and repair can take anywhere from 1 to 3 hours, depending on the complexity of the issue. It's important to note that labor rates can vary based on location, vehicle make and model, and engine type. In metropolitan areas or at dealerships, rates may be higher, while independent shops often charge less. For a more precise estimate, it's advisable to check local rates and obtain quotes from several repair shops.
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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.
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