EV Diagnostics
Verified EV diagnostic knowledge page

Cadillac U2BF3

Please have ready current session log including "Vehicle DTC and ID infor

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Cadillac/GM service facility if U2BF3 returns after code clearing and Service Mode verification. The verified bulletin directs technicians to open a TAC case in that situation.
Confidence95%

Quick answer

For a 2024 Cadillac LYRIQ in the U.S., U2BF3 is covered by GM Preliminary Information PIP5961A. The verified instruction is to clear codes, place the vehicle in Service Mode, and check whether the DTC returns. If U2BF3 returns, the bulletin directs the technician to open a TAC case and have the current session log, including “Vehicle DTC and ID” information, ready.

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.

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 U2BF3 mean?

For a 2024 Cadillac LYRIQ in the U.S., U2BF3 is covered by GM Preliminary Information PIP5961A. The verified instruction is to clear codes, place the vehicle in Service Mode, and check whether the DTC returns. If U2BF3 returns, the bulletin directs the technician to open a TAC case and have the current session log, including “Vehicle DTC and ID” information, ready.

2. Technical explanation

Verified NHTSA-published manufacturer communication PIP5961A states that when U2BF3 returns after a DTC clear and verification in Service Mode, a Technical Assistance Center (TAC) case should be started. The supplied evidence does not establish a component-level fault definition, root cause, or repair for U2BF3.

3. What system is affected?

Not yet established by verified evidence.

4. How serious is this code?

Unknown. The supplied verified evidence does not assign a severity level.

5. Symptoms you may notice

  • Not yet established by verified evidence.

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

  • Arrange diagnosis by a Cadillac/GM service facility if U2BF3 is present or returns.
  • Provide the service facility with the DTC and any available current session log information.
  • Do not attempt high-voltage system diagnosis or repair yourself.

10. Step-by-step troubleshooting

  1. The verified manufacturer procedure is for a technician to perform a DTC Code Clear.
  2. The technician then places the vehicle in Service Mode and verifies whether DTCs have returned.
  3. If U2BF3 returns, PIP5961A directs the technician to start a TAC case and reference the Preliminary Information document.
  4. The bulletin says to have the current session log available, including “Vehicle DTC and ID” information.

11. When to contact service

Contact a Cadillac/GM service facility if U2BF3 returns after code clearing and Service Mode verification. The verified bulletin directs technicians to open a TAC case in that situation.

12. What the service center may check

  • Perform a DTC Code Clear.
  • Place the vehicle in Service Mode.
  • Verify whether DTCs have returned.
  • If U2BF3 returns, start a TAC case and reference PIP5961A.
  • Have the current session log, including “Vehicle DTC and ID” information, ready.

13. Possible repair or resolution

  • Not yet established by verified evidence. PIP5961A provides an escalation process to TAC when U2BF3 returns; the supplied evidence does not state a final repair.

14. Affected vehicles

15. Related TSBs / service bulletins

  • GM Preliminary Information PIP5961A, published by NHTSA as Manufacturer Communication PDF 10253063 on March 6, 2024. It applies in the supplied evidence to the 2024 Cadillac LYRIQ in the U.S. and directs TAC escalation if U2BF3 returns after code clear and Service Mode verification.

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 10253063, GM Preliminary Information PIP5961A: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253063-9999.pdf

19. Frequently asked questions

What does U2BF3 mean on a 2024 Cadillac LYRIQ?

The supplied verified evidence identifies U2BF3 in PIP5961A but does not establish a full component-level definition. The bulletin instructs TAC escalation if it returns after a code clear and Service Mode verification.

Does U2BF3 require service?

If U2BF3 returns after the verified code-clear and Service Mode check, PIP5961A directs the technician to start a TAC case.

Can I drive or charge with U2BF3?

Not yet established by verified evidence.

20. Sources & verification

Verified
Cadillac U2BF3: Please have ready current session log including… | EV Diagnostics