EV Diagnostics
Verified EV diagnostic knowledge page

Mazda In Vehicle Network Malfunction

In Vehicle Network Malfunction

Common search variants: In-Vehicle Network Malfunction · Search ignores case and common separators.

DriveNot yet established by verified evidence. The supplied diagnostic record lists safe-to-drive status as unknown.
ChargeNot yet established by verified evidence. The supplied diagnostic record lists safe-to-charge status as unknown.
ServiceService need is not yet established by the supplied diagnostic record, but professional diagnosis is appropriate because an official Mazda communication documents this warning in connection with stored DTC B119F:01.
Confidence90%

Quick answer

For a 2022 US Mazda MX-30, the “In-Vehicle Network Malfunction” warning is documented in Mazda communication SA-038-24 as potentially occurring with the master warning light and DTC B119F:01 stored. The bulletin identifies B119F:01 as “TCU - Tel antenna No. 1 malfunction.”

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

Video guides

Watch Videos

Relevant videos play here without leaving this diagnostic page.

“In-vehicle network malfunction” Warning in MazdaTopicMotor
2021 Mazda CX-30 In Vehicle Network Malfunction. FIXED!Shop Foreman Garage
“In-vehicle network malfunction” Warning in MazdaTopicMotor

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

1. What does In Vehicle Network Malfunction mean?

For a 2022 US Mazda MX-30, the “In-Vehicle Network Malfunction” warning is documented in Mazda communication SA-038-24 as potentially occurring with the master warning light and DTC B119F:01 stored. The bulletin identifies B119F:01 as “TCU - Tel antenna No. 1 malfunction.”

2. Technical explanation

Verified NHTSA-posted Mazda manufacturer communication 11003361 (SA-038-24), published June 14, 2024, describes customers experiencing a master warning light and/or an “In-Vehicle Network Malfunction” message in the instrument cluster with DTC B119F:01 stored. In that communication, B119F:01 is identified as a TCU (Telematics Control Unit) telephone antenna No. 1 malfunction. The supplied evidence does not establish whether this warning always indicates B119F:01 or whether other faults can produce the same message.

3. What system is affected?

The verified communication associates the documented condition with the Telematics Control Unit (TCU) and telephone antenna No. 1.

4. How serious is this code?

Unknown. The supplied diagnostic record lists severity as unknown.

5. Symptoms you may notice

  • Master warning light may illuminate.
  • “In-Vehicle Network Malfunction” warning message may appear in the instrument cluster.
  • DTC B119F:01 may be stored.

6. Possible causes

  • Verified documented association: B119F:01, identified as “TCU - Tel antenna No. 1 malfunction.”
  • Any further root cause is not yet established by verified evidence.

7. Can I still drive the vehicle?

Not yet established by verified evidence. The supplied diagnostic record lists safe-to-drive status as unknown.

8. Can I charge the vehicle?

Not yet established by verified evidence. The supplied diagnostic record lists safe-to-charge status as unknown.

9. What you can safely do

  • Arrange diagnosis by a Mazda dealer or qualified service facility.
  • Record the exact warning message and whether the master warning light is illuminated.
  • Do not attempt high-voltage-system repairs based on this warning.

10. Step-by-step troubleshooting

  1. Have a service facility retrieve stored diagnostic trouble codes, including whether B119F:01 is present.
  2. Ask the service facility to review Mazda communication SA-038-24 / NHTSA manufacturer communication 11003361 for applicability.

11. When to contact service

Service need is not yet established by the supplied diagnostic record, but professional diagnosis is appropriate because an official Mazda communication documents this warning in connection with stored DTC B119F:01.

12. What the service center may check

  • Retrieve diagnostic trouble codes.
  • Confirm whether DTC B119F:01 is stored.
  • Review Mazda SA-038-24 / NHTSA manufacturer communication 11003361 for the vehicle and condition.

13. Possible repair or resolution

  • Not yet established by verified evidence in the supplied material.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Mazda SA-038-24, NHTSA Manufacturer Communication 11003361, published June 14, 2024. It applies in the supplied applicability data to the 2022 Mazda MX-30 in the US and documents the warning in association with DTC B119F:01 (TCU - Tel antenna No. 1 malfunction).

16. Recall information

  • Not yet established by verified evidence. No recall information was supplied.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication 11003361, Mazda SA-038-24: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2020-2024.zip#nhtsa_id=11003361

19. Frequently asked questions

What does “In-Vehicle Network Malfunction” mean on a 2022 Mazda MX-30?

Mazda communication SA-038-24 documents this message occurring with DTC B119F:01 stored, identified as a TCU telephone antenna No. 1 malfunction. The supplied evidence does not establish that this is the only possible meaning.

Is it safe to drive or charge?

Not yet established by verified evidence. Both safe-to-drive and safe-to-charge statuses are listed as unknown in the supplied diagnostic record.

What code is associated with this warning in Mazda SA-038-24?

B119F:01, identified in the supplied official communication as “TCU - Tel antenna No. 1 malfunction.”

20. Sources & verification

Verified
Show all 16 verified sources
Mazda In Vehicle Network Malfunction: In Vehicle Network Malfunction | EV Diagnostics