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Chevrolet B1A1F

NA-085 or 25-NA-183 please update the radio it should correct the

DriveNot yet established by verified evidence. The diagnostic record lists safe-to-drive status as unknown.
ChargeNot yet established by verified evidence. The diagnostic record lists safe-to-charge status as unknown.
ServiceService is recommended to confirm the vehicle’s exact applicability, stored DTC combination, and eligibility for the referenced radio software. The supplied diagnostic record does not independently mark service as required.
Confidence95%

Quick answer

For applicable Chevrolet vehicles, DTC B1A1F is addressed in GM/NHTSA manufacturer communications as a radio-related diagnostic condition. When B1A1F.00 is present with specified companion codes and the vehicle is eligible for software in 25-NA-085 or 25-NA-183, the communication says to update the radio; it should correct the concern.

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

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1. What does B1A1F mean?

For applicable Chevrolet vehicles, DTC B1A1F is addressed in GM/NHTSA manufacturer communications as a radio-related diagnostic condition. When B1A1F.00 is present with specified companion codes and the vehicle is eligible for software in 25-NA-085 or 25-NA-183, the communication says to update the radio; it should correct the concern.

2. Technical explanation

Verified manufacturer-communication evidence instructs technicians to use Service Information (SI) diagnostics when a DTC is set. If SI diagnostics direct radio replacement, the bulletin pathway applies. The evidence further states that when B1A1F.00 appears with B1A1B.00, U1516, and U164E, and the vehicle can receive the software listed in 25-NA-085 or 25-NA-183, updating the radio should correct the concern. The supplied evidence does not establish a standalone technical definition, root cause, or symptom for B1A1F.

3. What system is affected?

Radio / infotainment system, based on the verified manufacturer communications.

4. How serious is this code?

Not yet established by verified evidence. The diagnostic record lists severity as unknown.

5. Symptoms you may notice

  • Not yet established by verified evidence.

6. Possible causes

  • A radio software condition may be relevant when the bulletin conditions are met; the verified communications direct a radio update in the specified DTC/software-eligibility scenario.
  • A standalone root cause for B1A1F is not yet established by verified evidence.

7. Can I still drive the vehicle?

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

8. Can I charge the vehicle?

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

9. What you can safely do

  • Arrange diagnosis by a Chevrolet dealer or qualified service professional.
  • Provide the stored DTCs and ask the service provider to check applicable GM Service Information and whether the vehicle is eligible for the radio software listed in 25-NA-085 or 25-NA-183.
  • Do not attempt radio programming or module replacement without the applicable service procedure.

10. Step-by-step troubleshooting

  1. Read and record all DTCs, including whether B1A1F.00 is accompanied by B1A1B.00, U1516, or U164E.
  2. Follow GM Service Information diagnostics for the stored DTCs.
  3. If SI diagnostics instruct radio replacement, follow the applicable bulletin process.
  4. If the specified DTC combination is present and the vehicle is eligible for software listed in 25-NA-085 or 25-NA-183, update the radio as directed by the manufacturer communication.

11. When to contact service

Service is recommended to confirm the vehicle’s exact applicability, stored DTC combination, and eligibility for the referenced radio software. The supplied diagnostic record does not independently mark service as required.

12. What the service center may check

  • Confirm the exact DTC format, including B1A1F.00 where applicable.
  • Check for B1A1B.00, U1516, and U164E companion codes referenced in PIT6393 revisions.
  • Use GM Service Information diagnostics.
  • Determine whether the vehicle can receive software listed in 25-NA-085 or 25-NA-183.
  • Perform the radio update when the verified bulletin criteria are met.

13. Possible repair or resolution

  • Radio software update, when the specified DTC conditions and software eligibility are met.
  • Radio replacement only if GM Service Information diagnostics instruct replacement.

14. Affected vehicles

15. Related TSBs / service bulletins

  • PIT6393L, NHTSA Manufacturer Communication MC-11032781-0001, published 2026-05-14: references B1A1F.00, B1A1B.00, U1516, and U164E and vehicles listed in 25-NA-085 or 25-NA-183.
  • PIT6393K, NHTSA Manufacturer Communication MC-11032554-0001, published 2026-04-28.
  • PIT6393J, NHTSA Manufacturer Communication MC-11029962-0001, published 2026-03-06: directs technicians to use SI diagnostics and, when criteria are met, update the radio with software listed in 25-NA-085 or 25-NA-183.
  • PIT6393H, NHTSA Manufacturer Communication MC-11026861-0001, published 2025-12-23.
  • PIT6393F, NHTSA Manufacturer Communication MC-11024704-0001, published 2025-10-23.
  • PIT6393E, NHTSA Manufacturer Communication MC-11024438-0001, published 2025-10-04.
  • PIT6393D, NHTSA Manufacturer Communication MC-11023907-0001, published 2025-10-01.
  • PIT6393C, NHTSA Manufacturer Communication MC-11023342-0001, published 2025-09-15.
  • PIT6457B, NHTSA Manufacturer Communication MC-11027686-0001, published 2026-01-12: lists B1A1F among radio-related DTC keywords.

16. Recall information

  • Not yet established by verified evidence. The supplied sources are manufacturer communications/service bulletins, not recall records.

17. Official manufacturer information

Verified official sources are NHTSA-hosted Chevrolet/GM manufacturer communications, including PIT6393 revisions and PIT6457B. Applicable vehicles in the supplied data: US-market Chevrolet Blazer, Bolt EV, Bolt EUV, and Equinox, model years 2023–2026. Equinox is also separately listed for model years 2024–2026. Exact bulletin applicability must be confirmed by the service provider.

19. Frequently asked questions

What does B1A1F mean on an applicable Chevrolet?

The supplied diagnostic record labels B1A1F with a radio-update instruction tied to 25-NA-085 or 25-NA-183. The verified communications treat B1A1F.00 as a DTC to diagnose through GM Service Information; they do not provide a standalone technical definition in the supplied evidence.

Will a radio update fix B1A1F?

The verified communications state that updating the radio should correct the concern when B1A1F.00 is present with the specified companion codes and the vehicle can receive software listed in 25-NA-085 or 25-NA-183.

Does B1A1F require radio replacement?

Not automatically. The communications say to follow SI diagnostics. If SI diagnostics instruct radio replacement, then follow that direction; otherwise, the specified software update may be applicable.

Is B1A1F safe to drive or charge with?

Not yet established by verified evidence. Both statuses are listed as unknown in the supplied diagnostic record.

20. Sources & verification

Verified
Chevrolet B1A1F: NA-085 or 25-NA-183 please update the radio it should… | EV Diagnostics