B3979 2018 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 2018 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 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC B3979 2018 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 2018 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 2018 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.
Need more information about the B3979 2018 Chevrolet Silverado code?
Need more information on how to fix the B3979 2018 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the B3979 2018 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about B3979 2018 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code B3979 in a 2018 Chevrolet Silverado?
- Common symptoms include issues with the heating, ventilation, and air conditioning (HVAC) system such as erratic temperature control, inconsistent airflow, or the system not responding properly.
2. What does the OBDII code B3979, "Incorrect Environmental Identifier Received from HVAC Control Module," mean in a 2018 Chevrolet Silverado?
- This code indicates that there is a communication error between the HVAC control module and another system, resulting in incorrect environmental data being received.
3. What are some possible causes of OBDII code B3979 in a 2018 Chevrolet Silverado?
- Possible causes include a faulty HVAC control module, wiring issues or shorts in the communication lines, a malfunctioning environmental sensor, or a software glitch in the vehicle's system.
4. How can I diagnose OBDII code B3979 in my 2018 Chevrolet Silverado?
- To diagnose this code, a professional diagnostic scan tool can be used to retrieve the specific error codes and data associated with the HVAC control module and related systems.
5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code B3979 present?
- While the vehicle may still be operational with this code present, it is recommended to address the underlying issue promptly to prevent further damage to the HVAC system or other related components.
6. How can I repair OBDII code B3979 in my 2018 Chevrolet Silverado?
- Repair options may include resetting the HVAC control module, checking and repairing any damaged wiring or connections, replacing the environmental sensor if necessary, or updating the vehicle's software.
7. Is it necessary to visit a dealership for OBDII code B3979 repair in a 2018 Chevrolet Silverado?
- While a dealership may have specialized tools and expertise for this repair, independent automotive repair shops with experience in HVAC systems and OBDII diagnostics can also effectively address this issue.
8. Can a DIY enthusiast fix OBDII code B3979 in a 2018 Chevrolet Silverado?
- Depending on the individual's skill level and access to diagnostic tools, some DIY enthusiasts may be able to diagnose and repair this code themselves. However, professional assistance is recommended for complex electrical issues.
9. How much does it typically cost to repair OBDII code B3979 in a 2018 Chevrolet Silverado?
- Repair costs can vary based on the specific cause of the code and the labor rates in your area. Generally, repairs for this code can range from a few hundred to over a thousand dollars, including parts and labor.
10. Can OBDII code B3979 in a 2018 Chevrolet Silverado cause other problems if left unresolved?
- If left unresolved, this code can potentially lead to further malfunctions in the HVAC system, affecting the comfort and safety of the vehicle's occupants. It is advisable to address the issue promptly to prevent any additional issues.
Discuss the causes and fixes for B3979 2018 Chevrolet Silverado OBDII Code
Code B3979 2018 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
