B3928 Code - Incorrect Environmental Identifier Received from Telematics Communication Interface 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 Telematics Communication Interface Control Module, Telematics Communication Interface Control Module harness is open or shorted, Telematics Communication Interface 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
- B3928 indicates Incorrect Environmental Identifier Received from Telematics Communication Interface Control Module.
- Common causes
- Common causes include Faulty Telematics Communication Interface Control Module, Telematics Communication Interface Control Module harness is open or shorted, Telematics Communication Interface 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 B3928 Description
The Diagnostic Trouble Code (DTC) sets when the control module's environment identifier does not match the environment identifier stored by the BCM.
What are the Possible Causes of the DTC B3928?
- Faulty Telematics Communication Interface Control Module
- Telematics Communication Interface Control Module harness is open or shorted
- Telematics Communication Interface Control Module circuit poor electrical connection
- Faulty Body Control Module (BCM)
How to Fix the DTC B3928?
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 B3928 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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Information for Specific Makes
- B3928 Buick — Incorrect Environmental Identifier Received from Telematics Communication Interface Control Module
- B3928 Cadillac — Incorrect Environmental Identifier Received from Telematics Communication Interface Control Module
- B3928 Chevrolet — Incorrect Environmental Identifier Received from Telematics Communication Interface Control Module
- B3928 GMC — Incorrect Environmental Identifier Received from Telematics Communication Interface Control Module
Frequently Asked Questions about B3928 Code
1. What does the OBDII code B3928 mean?
The B3928 code indicates that the vehicle's telematics communication interface control module has received an incorrect environmental identifier, signaling a communication or configuration issue.
2. What are the common symptoms of code B3928?
Symptoms may include a malfunctioning telematics system, inoperative OnStar or similar services, error messages on the infotainment screen, or failure to establish a connection with telematics services.
3. What causes the B3928 code to appear?
Common causes include software mismatches, incorrect module programming, a failed telematics control module, or faulty wiring and connections in the telematics system.
4. How is the B3928 code diagnosed?
A technician will use a scan tool to read the code and check for communication issues, inspect the telematics control module, and verify proper software programming and wiring integrity.
5. Can a software update fix the B3928 code?
Yes, in many cases, updating or reprogramming the telematics module's software can resolve the issue if the code is triggered by a software mismatch.
6. Does the B3928 code affect vehicle performance?
This code typically does not impact basic vehicle performance but can affect telematics features like navigation, emergency services, or remote connectivity.
7. Can a weak or dead battery cause the B3928 code?
Yes, a weak or dead battery can cause module communication errors, potentially triggering this code if the telematics system fails to initialize properly.
8. Is the telematics module the only potential cause of the B3928 code?
No, other potential causes include wiring faults, network communication issues, or other control modules sending incorrect data.
9. How much does it cost to repair the B3928 code?
Repair costs vary depending on the issue but may range from $100 to $500 for diagnostics, software updates, or module replacement.
10. Can I clear the B3928 code without fixing the problem?
Clearing the code without addressing the root cause may result in the code returning shortly, as the underlying issue remains unresolved.
Discuss the causes and fixes for B3928 OBDII Code
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