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Chevrolet B101D-3C

F0 set as current in the OnStar VCIM. Note: The “upgrade” splitter is an additional piece of hardware and must be installed at the VCIM. If present, DO NOT remove any existing spli

Common search variants: B101D3C · B101D 3C · B101D_3C · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Chevrolet/GM service provider for diagnosis, particularly if the OnStar LED is red, OnStar cannot be reached, or the code becomes current during an OnStar call attempt.
Confidence95%

Quick answer

B101D-3C is a Chevrolet DTC titled “free calling for inbound and outbound.” Verified GM/NHTSA communications place it in the OnStar Vehicle Communication Interface Module (VCIM) context. It may be set current with a red OnStar LED if cellular and antenna cables are installed on the splitter incorrectly during certain module-upgrade work.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

Video guides

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DTC Chevrolet B101D-3C Short ExplanationMaxidot Chevrolet

Videos are supporting material and never override OEM or regulator evidence.

1. What does B101D-3C mean?

B101D-3C is a Chevrolet DTC titled “free calling for inbound and outbound.” Verified GM/NHTSA communications place it in the OnStar Vehicle Communication Interface Module (VCIM) context. It may be set current with a red OnStar LED if cellular and antenna cables are installed on the splitter incorrectly during certain module-upgrade work.

2. Technical explanation

Verified evidence identifies B101D-3C as “free calling for inbound and outbound.” GM diagnostic communication PIT5236J directs technicians to record the OnStar LED status, test the Blue OnStar button, and note results of OnStar hands-free calling for inbound and outbound. If B101D-3C is stored in history, the communication directs documentation of the customer concern, whether OnStar could be reached, whether current GPS location was available, and whether the code becomes current when an OnStar call is attempted. GM communications 15-08-44-001I and 150844001J state that, during installation of antenna and cellular cables to a splitter, incorrectly installed cables can result in a red LED and current B101D-3C and B101D-F0 in the OnStar VCIM.

3. What system is affected?

OnStar Vehicle Communication Interface Module (VCIM) and its cellular/antenna splitter connection context.

4. How serious is this code?

Unknown. The verified evidence does not establish a vehicle-safety severity level.

5. Symptoms you may notice

  • A red OnStar LED may be present when the antenna and cellular cables are incorrectly installed at the splitter during applicable installation work.
  • OnStar connection concerns may be relevant to diagnosis.
  • Inbound and outbound OnStar hands-free calling results are specifically relevant to diagnosis.
  • Current GPS location availability is specifically relevant to diagnosis.

6. Possible causes

  • During applicable module-upgrade installation work, the antenna cable and cellular cable may have been connected to the splitter incorrectly.
  • Other causes are 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 OnStar LED status.
  • Press the Blue OnStar button and note the result.
  • Note the results of inbound and outbound OnStar hands-free calling.
  • If the code is stored in history, document the customer concern, duration, OnStar connection status, and current GPS-location availability.
  • Arrange diagnosis by a Chevrolet/GM service professional if the concern persists.

10. Step-by-step troubleshooting

  1. Determine whether B101D-3C is current or stored in history.
  2. Record whether the OnStar LED is red, green, off, or another status.
  3. Press the Blue OnStar button and record the result.
  4. Record the results of inbound and outbound OnStar hands-free calling.
  5. For a history code, determine whether B101D-3C becomes current when attempting to call OnStar.
  6. Where applicable, a trained technician should verify correct cellular and antenna cable connection to the VCIM splitter.

11. When to contact service

Contact a Chevrolet/GM service provider for diagnosis, particularly if the OnStar LED is red, OnStar cannot be reached, or the code becomes current during an OnStar call attempt.

12. What the service center may check

  • Check VCIM diagnostic status for B101D-3C, including whether it is current or history.
  • Record OnStar LED status.
  • Test the Blue OnStar button.
  • Test OnStar hands-free calling for inbound and outbound operation.
  • Document OnStar connection status and GPS-location availability when the code is stored in history.
  • During applicable upgrade work, inspect that cellular and antenna cables are connected to the splitter correctly and that existing splitters are not removed.

13. Possible repair or resolution

  • For the documented installation-related condition, correct installation of the antenna and cellular cables to the VCIM splitter is the relevant service resolution.
  • Further repair resolution is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM communication 15-08-44-001I, published March 21, 2017: During splitter installation, incorrectly installed antenna and cellular cables may result in a red LED and current B101D-3C and B101D-F0 in the OnStar VCIM. https://static.nhtsa.gov/odi/tsbs/2017/MC-10138019-9999.pdf
  • GM communication PIT5236J, published January 11, 2017: Provides diagnostic information to record OnStar LED/button/calling results and document details when B101D-3C is stored in history. https://static.nhtsa.gov/odi/tsbs/2017/MC-10113318-9999.pdf
  • GM communication 150844001J, published September 11, 2019: Reiterates that incorrect antenna/cellular cable installation at the splitter may set current B101D-3C and B101D-F0 with a red LED in the OnStar VCIM. https://static.nhtsa.gov/odi/tsbs/2019/MC-10166666-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified official NHTSA-hosted GM manufacturer communications are available in the TSB/service-bulletins section.

19. Frequently asked questions

What does B101D-3C mean?

Verified diagnostic data titles B101D-3C as “free calling for inbound and outbound.”

Can incorrect splitter cable installation set B101D-3C?

Yes. GM communications state that incorrectly connecting the antenna and cellular cables to the splitter during applicable installation can produce a red LED and set B101D-3C and B101D-F0 current in the OnStar VCIM.

What should be checked for a history B101D-3C?

GM directs recording the OnStar LED status, Blue OnStar button result, inbound/outbound hands-free calling results, OnStar connection status, GPS-location availability, and whether the code becomes current while attempting an OnStar call.

Is it safe to drive or charge with B101D-3C?

Not yet established by verified evidence.

20. Sources & verification

Verified
Chevrolet B101D-3C: F0 set as current in the OnStar VCIM. Note: The… | EV Diagnostics