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Cadillac U1962

Correction: The dealer will need to perform the Serial Data Authentication Con guration (SDAC) following Instructions in SI using Document ID: 5404959. Be sure the vehicle is Power

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Cadillac dealer or qualified GM service facility. The verified manufacturer communication specifies a dealer SDAC procedure rather than an owner-performed repair.
Confidence95%

Quick answer

For applicable U.S.-market Cadillac LYRIQ vehicles, verified Cadillac manufacturer communications identify U1962 as an indicator that Serial Data Authentication Configuration (SDAC) may not have completed properly. The documented correction is dealer performance of the SDAC procedure using GM Service Information document ID 5404959, with the vehicle Power Mode OFF before the procedure.

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 U1962 mean?

For applicable U.S.-market Cadillac LYRIQ vehicles, verified Cadillac manufacturer communications identify U1962 as an indicator that Serial Data Authentication Configuration (SDAC) may not have completed properly. The documented correction is dealer performance of the SDAC procedure using GM Service Information document ID 5404959, with the vehicle Power Mode OFF before the procedure.

2. Technical explanation

SDAC is described in the verified manufacturer communications as a security handshake between vehicle modules. It normally runs automatically as part of programming. A current U1962 in one or more modules is identified as a main indicator that SDAC did not complete properly. The communications also state that an SDAC setup step can fail or remain incomplete even when programming appears to run successfully.

3. What system is affected?

Serial Data Authentication Configuration (SDAC), a security-authentication process between vehicle modules.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

  • U1962 may be current in one or more modules.
  • An SDAC setup step may fail or be incomplete.
  • Programming may appear to run successfully even though the SDAC-related step fails.

6. Possible causes

  • Verified evidence identifies incomplete or failed Serial Data Authentication Configuration (SDAC) as the condition associated with U1962.
  • The verified communications state that SDAC runs automatically as part of programming.

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 dealer diagnosis and correction using the applicable Cadillac/GM service procedure.
  • Do not attempt module programming or SDAC configuration without authorized service tools and procedures.

10. Step-by-step troubleshooting

  1. A dealer should confirm whether U1962 is current in one or more modules.
  2. A dealer should assess whether the Serial Data Authentication Configuration procedure completed properly.
  3. The verified correction directs the dealer to perform SDAC following Service Information document ID 5404959.
  4. The verified communication instructs that the vehicle be in Power Mode OFF before the SDAC procedure is run.

11. When to contact service

Contact a Cadillac dealer or qualified GM service facility. The verified manufacturer communication specifies a dealer SDAC procedure rather than an owner-performed repair.

12. What the service center may check

  • Check whether U1962 is current in one or more modules.
  • Determine whether the SDAC procedure failed, was incomplete, or did not complete properly.
  • Perform SDAC according to GM Service Information document ID 5404959 with the vehicle in Power Mode OFF.

13. Possible repair or resolution

  • Dealer performance of Serial Data Authentication Configuration (SDAC) following GM Service Information document ID 5404959 is the verified correction.
  • The evidence does not establish any parts replacement requirement.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Cadillac/GM PIT5832U, published January 24, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11013468-0001.pdf
  • Cadillac/GM PIT5985J, published January 24, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11013463-0001.pdf
  • Cadillac/GM PIT5832S, published December 13, 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-11011872-0001.pdf
  • Cadillac/GM PIT5832R, published October 28, 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-11011475-0001.pdf
  • Cadillac/GM PIT5832P, published August 14, 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-11006357-0001.pdf
  • Cadillac/GM PIT5832M, published August 13, 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-11006294-0001.pdf
  • Cadillac/GM PIT5832N, published August 13, 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-11006313-0001.pdf
  • Cadillac/GM PIT5832L, published March 11, 2024: https://static.nhtsa.gov/odi/tsbs/2024/MC-10253075-9999.pdf
  • Cadillac/GM PIT5832K, published November 14, 2023: https://static.nhtsa.gov/odi/tsbs/2023/MC-10247355-9999.pdf
  • Cadillac/GM PIT5832J, published August 30, 2023: https://static.nhtsa.gov/odi/tsbs/2023/MC-10242322-9999.pdf
  • Cadillac/GM PIT5832H, published May 11, 2023: https://static.nhtsa.gov/odi/tsbs/2023/MC-10237651-9999.pdf
  • Cadillac/GM PIT5832G, published March 6, 2023: https://static.nhtsa.gov/odi/tsbs/2023/MC-10234206-9999.pdf

16. Recall information

  • Not yet established by verified evidence.

17. Official manufacturer information

Verified NHTSA-hosted Cadillac/GM manufacturer communications apply to U.S.-market Cadillac LYRIQ model years 2023 through 2025 in the supplied evidence. The newest supplied communication is PIT5832U, published January 24, 2025: https://static.nhtsa.gov/odi/tsbs/2025/MC-11013468-0001.pdf

19. Frequently asked questions

What does U1962 indicate on an applicable Cadillac LYRIQ?

The verified manufacturer communications identify a current U1962 in one or more modules as a main indicator that SDAC did not complete properly.

What is SDAC?

The verified communications describe SDAC as a security handshake between all vehicle modules.

Can programming look successful when this condition occurs?

Yes. The verified communications state that an SDAC-related step may fail even though programming appears to run successfully.

What is the documented correction?

The documented correction is for a dealer to perform SDAC following GM Service Information document ID 5404959, with the vehicle in Power Mode OFF before the procedure.

Does the evidence establish whether the vehicle is safe to drive or charge?

No. Driveability and charging safety are not yet established by verified evidence.

20. Sources & verification

Verified
Cadillac U1962: Correction: The dealer will need to perform the Serial… | EV Diagnostics