Chevrolet B101D SYM39
• DPID 11 Byte1: • DPID 11 Byte2: • DPID 11 Byte3: • DPID 11 Byte4: • DPID 11 Byte5: • DPID 11 Byte6: • DPID 1
Common search variants: B101DSYM39 · B101D-SYM39 · B101D_SYM39 · Search ignores case and common separators.
Quick answer
B101D SYM39 is documented in a GM/NHTSA technician communication as a sub-code that must be recorded during diagnosis of an OnStar/Vehicle Communications Interface Module (VCIM) concern. Its specific fault meaning is not established by the verified evidence provided.
This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.
Watch Videos
Relevant videos play here without leaving this diagnostic page.
No sufficiently relevant embeddable video has been accepted for this diagnostic yet.
Videos are supporting material and never override OEM or regulator evidence.
1. What does B101D SYM39 mean?
B101D SYM39 is documented in a GM/NHTSA technician communication as a sub-code that must be recorded during diagnosis of an OnStar/Vehicle Communications Interface Module (VCIM) concern. Its specific fault meaning is not established by the verified evidence provided.
2. Technical explanation
The verified GM communication instructs technicians to record the sub-code, with B101D SYM39 given as an example, and to collect VCIM DTC Data through: Module Diagnostics > Vehicle Communications Interface Module > Data Display > DTC Data. The document lists DPID 11 Byte0 through Byte6 and DPID 1 as information to record. No interpretation of the individual DPID values or a component-level definition of B101D SYM39 is provided in the supplied evidence.
3. What system is affected?
OnStar / Vehicle Communications Interface Module (VCIM), based on the diagnostic procedure context in the verified GM communication.
4. How serious is this code?
Unknown. Severity is not established by verified evidence.
5. Symptoms you may notice
- Not yet established by verified evidence. The GM communication asks technicians to assess OnStar key-press connection behavior and GPS-location availability, but it does not establish these as symptoms caused by B101D SYM39.
6. Possible causes
- Not yet established by verified evidence.
7. Can I still drive the vehicle?
Not yet established by verified evidence.
8. Can I charge the vehicle?
Not yet established by verified evidence.
9. What you can safely do
- Record the complete sub-code exactly as displayed, including SYM39.
- If service is sought, provide the technician with the code B101D SYM39 and any observed OnStar key-press behavior.
- Do not attempt high-voltage or module repair procedures based on this code alone.
10. Step-by-step troubleshooting
- The verified GM communication directs technicians to document whether the customer has an active OnStar account, where applicable with data availability.
- Document what occurs when an OnStar key press is made.
- Document whether the system connects following a key press.
- Document whether OnStar has a current GPS location following a key press.
- Check whether location masking or TTY is enabled.
- Using appropriate professional diagnostic equipment, access Module Diagnostics > Vehicle Communications Interface Module > Data Display > DTC Data.
- Record DPID 11 Byte0, Byte1, Byte2, Byte3, Byte4, Byte5, Byte6, and DPID 1. The supplied evidence does not provide value interpretation.
11. When to contact service
Contact a Chevrolet/GM service provider or GM Technical Assistance Center-supported technician if the code is active or an OnStar concern is present. The verified communication specifically calls for recording the sub-code and VCIM data for diagnostic support.
12. What the service center may check
- Confirm the active DTC sub-code, such as B101D SYM39.
- Collect the OnStar account, key-press connection, GPS-location, location-masking, and TTY information requested in the GM communication.
- Retrieve and record VCIM DTC Data, including DPID 11 Byte0 through Byte6 and DPID 1.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Chevrolet Bolt EV · 2020 · US
15. Related TSBs / service bulletins
- NHTSA Manufacturer Communication PDF 10172292: 030846004W, published January 13, 2020. The communication references B101D SYM39 as an example sub-code to record and provides VCIM/OnStar diagnostic data-collection steps. It does not provide a verified repair for this code in the supplied evidence.
16. Recall information
- Not yet established by verified evidence.
17. Official manufacturer information
Verified source: NHTSA Manufacturer Communication PDF 10172292: 030846004W (GM), published January 13, 2020: https://static.nhtsa.gov/odi/tsbs/2020/MC-10172292-9999.pdf
19. Frequently asked questions
What does B101D SYM39 mean?
The supplied verified evidence identifies it as a sub-code to record during GM OnStar/VCIM diagnosis. A specific fault definition is not yet established by verified evidence.
Which vehicle is supported by the supplied applicability data?
2020 Chevrolet Bolt EV, United States.
Does B101D SYM39 mean the vehicle is unsafe to drive or charge?
Not yet established by verified evidence.
What information should be recorded for service?
Record the exact sub-code; OnStar key-press connection and GPS-location results; whether location masking or TTY is enabled; and VCIM DTC Data values for DPID 11 Byte0 through Byte6 and DPID 1.