B3979 2015 Chevrolet Silverado Code - Incorrect Environmental Identifier Received from HVAC Control Module
Quick Answer
When certain modules are programmed and configured during installation, the module learns a specific environment identifier which is unique to the vehicle. Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, HVAC Control Module harness is open or shorted, HVAC Control Module 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
- B3979 2015 Chevrolet Silverado indicates Incorrect Environmental Identifier Received from HVAC Control Module.
- Common causes
- Common causes include Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module, HVAC Control Module harness is open or shorted, HVAC Control Module 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.
Code B3979 2015 Chevrolet Silverado Description
What are the Possible Causes of the DTC B3979 2015 Chevrolet Silverado?
- Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
- HVAC Control Module harness is open or shorted
- HVAC Control Module circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3979 2015 Chevrolet Silverado?
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 B3979 2015 Chevrolet Silverado 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.
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Frequently Asked Questions about B3979 2015 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code B3979 in a 2015 Chevrolet Silverado?
The common symptoms include inconsistent HVAC operation, incorrect temperature readings, and the inability to control the climate settings.
2. What does the OBDII code B3979 "Incorrect Environmental Identifier Received from HVAC Control Module" mean?
This code indicates a communication error between the HVAC control module and other vehicle systems responsible for climate control.
3. What are the possible causes of OBDII code B3979 in a 2015 Chevrolet Silverado?
Possible causes include a faulty HVAC control module, damaged wiring or connectors, software issues, or a malfunctioning climate control sensor.
4. How can I diagnose the OBDII code B3979 in my 2015 Chevrolet Silverado?
Diagnosis typically involves using a diagnostic scan tool to retrieve the code, checking the HVAC control module for errors, inspecting wiring for damage, and testing sensor functionality.
5. Can I continue to drive my 2015 Chevrolet Silverado with the OBDII code B3979 present?
While the vehicle may still be operable, it is recommended to address the issue promptly to avoid further damage to the HVAC system and ensure proper climate control functionality.
6. What are some repair tips for resolving OBDII code B3979 in a 2015 Chevrolet Silverado?
Repair tips include checking and repairing any damaged wiring, ensuring proper connections, resetting the HVAC control module, and updating software if necessary.
7. Can resetting the HVAC control module fix the OBDII code B3979 in a 2015 Chevrolet Silverado?
In some cases, resetting the HVAC control module can resolve the communication error and clear the code. However, if the issue persists, further diagnosis may be required.
8. Is it possible to repair the OBDII code B3979 in a 2015 Chevrolet Silverado without professional help?
Depending on your automotive repair skills and access to tools, you may be able to address simple causes such as loose connections or damaged wiring. However, complex issues may require professional assistance.
9. How much does it typically cost to repair OBDII code B3979 in a 2015 Chevrolet Silverado?
The cost of repair can vary depending on the specific cause of the code. Simple fixes like resetting the HVAC control module may be inexpensive, while replacing a faulty module or sensor can be more costly.
10. How can I prevent OBDII code B3979 from recurring in my 2015 Chevrolet Silverado?
Regular maintenance of the HVAC system, checking for loose connections, and addressing any wiring issues promptly can help prevent the recurrence of this code.
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