Cadillac U3631
U3620, U3622
Quick answer
For a 2023–2024 Cadillac LYRIQ in the U.S., U3631 is listed in the supplied diagnostic record with the meaning “U3620, U3622.” However, the supplied official bulletin evidence states that U3631 was removed from PIE0788B/PIE0788C on June 10, 2024. A current cause, driving/charging status, and repair procedure are not yet established by verified evidence.
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 U3631 mean?
For a 2023–2024 Cadillac LYRIQ in the U.S., U3631 is listed in the supplied diagnostic record with the meaning “U3620, U3622.” However, the supplied official bulletin evidence states that U3631 was removed from PIE0788B/PIE0788C on June 10, 2024. A current cause, driving/charging status, and repair procedure are not yet established by verified evidence.
2. Technical explanation
The supplied record identifies U3631 as a Cadillac DTC and gives its canonical title and meaning as “U3631 — U3620, U3622” / “U3620, U3622.” The verified NHTSA-hosted manufacturer communications PIE0788B and PIE0788C state that U3631 was removed from the bulletin’s covered DTC list in the June 10, 2024 revision. PIE0788B adds U3620 and U3622 as additional keywords. The supplied evidence does not define the technical fault represented by U3631 or establish that U3620 or U3622 are equivalent faults.
3. What system is affected?
Not yet established by verified evidence.
4. How serious is this code?
Unknown. The supplied diagnostic record lists severity as unknown.
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?
Unknown. The supplied diagnostic record lists safe-to-drive status as unknown.
8. Can I charge the vehicle?
Unknown. The supplied diagnostic record lists safe-to-charge status as unknown.
9. What you can safely do
- Use the vehicle information and current warning messages to decide whether immediate service is needed.
- Have a Cadillac/GM service provider diagnose the stored code if it remains present or is accompanied by vehicle warnings.
- Do not attempt high-voltage system diagnosis or repair based on this information.
10. Step-by-step troubleshooting
- Confirm the exact DTC(s) currently stored with a suitable diagnostic scan tool or through a Cadillac/GM service provider.
- Record any accompanying DTCs and vehicle warning messages for the service visit.
- Do not treat PIE0788B or PIE0788C as current U3631 repair guidance: the supplied bulletin evidence says U3631 was removed from its covered DTC list on June 10, 2024.
11. When to contact service
Service is appropriate if U3631 is present, especially if there are accompanying warnings or additional DTCs. The need for service is otherwise not established by the supplied evidence.
12. What the service center may check
- Verify the exact active and stored DTCs.
- Check for current Cadillac/GM service information applicable to the vehicle VIN and present DTCs.
- Review accompanying DTCs and vehicle warnings. Further specific checks are not yet established by verified evidence.
13. Possible repair or resolution
- Not yet established by verified evidence.
14. Affected vehicles
- Cadillac LYRIQ · 2023–2024 · US
15. Related TSBs / service bulletins
- PIE0788B, published June 10, 2024 and hosted by NHTSA as manufacturer communication 11004345: its evidence summary states that U3631 was removed from the bulletin’s DTC list on June 10, 2024. It lists U3620 and U3622 as additional keywords.
- PIE0788C, published June 28, 2024 and hosted by NHTSA as manufacturer communication 11004943: its evidence summary repeats that U3631 was removed on June 10, 2024.
16. Recall information
- No recall information was supplied or established by the verified evidence.
17. Official manufacturer information
Applicable vehicle population in the supplied data: 2023–2024 Cadillac LYRIQ, U.S. Official NHTSA-hosted manufacturer communications: PIE0788B (https://static.nhtsa.gov/odi/tsbs/2024/MC-11004345-0001.pdf) and PIE0788C (https://static.nhtsa.gov/odi/tsbs/2024/MC-11004943-0001.pdf).
19. Frequently asked questions
What does Cadillac DTC U3631 mean?
The supplied diagnostic record gives the canonical meaning as “U3620, U3622.” A technical definition of the fault is not yet established by verified evidence.
Does PIE0788 apply to U3631?
The supplied NHTSA-hosted summaries for PIE0788B and PIE0788C state that U3631 was removed from the bulletin’s DTC list on June 10, 2024. Therefore, the supplied evidence does not support using those revisions as current U3631-specific repair guidance.
Can I drive or charge with U3631?
Not yet established by verified evidence. The supplied diagnostic record marks both safe-to-drive and safe-to-charge status as unknown.