B3979 2014 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 2014 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 2014 Chevrolet Silverado Description
What are the Possible Causes of the DTC B3979 2014 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 2014 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 2014 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 2014 Chevrolet Silverado Code
1. What does the OBDII code B3979 mean on a 2014 Chevrolet Silverado?
B3979 indicates that the HVAC control module has received an incorrect environmental identifier, which can cause communication or configuration issues between modules.
2. What are the common symptoms of the B3979 code in a 2014 Silverado?
Symptoms may include improper HVAC operation, inability to control temperature or airflow, and possible warning lights on the dashboard.
3. What causes the B3979 code to appear?
The code is typically caused by a software mismatch, faulty HVAC control module, incorrect module programming, or communication errors between the body control module (BCM) and HVAC module.
4. Can B3979 affect other systems in the vehicle?
Yes, since it involves module communication, it could potentially cause issues with other connected systems, such as the BCM or lighting controls.
5. How is the B3979 code diagnosed?
A technician will use a scan tool to check for communication errors, verify module programming, inspect wiring and connectors, and ensure the modules are properly configured.
6. Can I reset the B3979 code to fix the issue?
Clearing the code without addressing the root cause will only temporarily remove it. Proper diagnosis and repair of the module or wiring issue are required.
7. Is a software update necessary to fix the B3979 code?
In some cases, reprogramming or updating the HVAC control module software can resolve the issue if it’s caused by a configuration mismatch.
8. What should I check if I get the B3979 code?
Inspect the HVAC control module wiring, ensure all connectors are secure, and verify that no recent programming changes were made incorrectly.
9. How much does it cost to fix the B3979 code on a 2014 Silverado?
The cost depends on whether it requires module programming, wiring repair, or module replacement, typically ranging between $150 and $500.
10. Can I drive my Silverado with the B3979 code active?
Yes, the vehicle is still drivable, but the HVAC system may not function properly, which could impact comfort and defogging capabilities.
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