B3924 on Cadillac vehicles
B3924 is named on 21 Cadillac model years (2018–2025): 35 manufacturer filings and 0 owner reports in NHTSA’s files, across XT5, XT6, CT6, XT4.
Which Cadillac model years name B3924
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2025 Cadillac XT5 | Electrical System | 2 | — |
| 2025 Cadillac XT6 | Electrical System | 2 | — |
| 2024 Cadillac XT5 | Electrical System | 2 | — |
| 2024 Cadillac XT6 | Electrical System | 2 | — |
| 2023 Cadillac XT5 | Electrical System | 2 | — |
| 2023 Cadillac XT6 | Electrical System | 2 | — |
| 2022 Cadillac XT5 | Electrical System | 2 | — |
| 2022 Cadillac XT6 | Electrical System | 2 | — |
| 2021 Cadillac XT5 | Electrical System | 2 | — |
| 2021 Cadillac XT6 | Electrical System | 2 | — |
| 2020 Cadillac XT5 | Electrical System | 2 | — |
| 2020 Cadillac XT6 | Electrical System | 2 | — |
| 2019 Cadillac XT5 | Engine | 2 | — |
| 2018 Cadillac XT5 | Electrical System | 2 | — |
| 2023 Cadillac XT4 | Electrical System | 1 | — |
| 2022 Cadillac XT4 | Electrical System | 1 | — |
| 2021 Cadillac XT4 | Electrical System | 1 | — |
| 2020 Cadillac CT6 | Electrical System | 1 | — |
| 2020 Cadillac XT4 | Electrical System | 1 | — |
| 2019 Cadillac CT6 | Electrical System | 1 | — |
| 2019 Cadillac XT4 | Electrical System | 1 | — |
A model year is listed because the code is named in its own record — a bulletin filed against it, or an owner’s complaint about it — not because every one of these vehicles sets it. Counts are documents in NHTSA’s files, not failure rates.
Cadillac filings that name B3924
Source: NHTSA manufacturer communicationsBulletins and campaigns Cadillac filed with NHTSA whose summary names B3924. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 23-NA-163 Service bulletin2024-08-13 · Electrical System
- This service bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925 00, B3926 00, B3927 00, B3928 00 Set.
- 23-NA-163 Service bulletin2025-03-13 · Electrical System
- This service bulletin provides repair information to correct a customer concern of No Crank, No Start, Quick Start/Stall, No FOB Detected, Key FOBs Inoperative, B3924 00, B3925 00, B3926 00, B3927 00, B3928 00 Set.
What B3924 means
Source: SAE J2012 / OBD-IIB3924 is a manufacturer-specific code: the second character is a 3, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
A stored code names the test that failed, never the part that caused it. The record above is what Cadillac and its owners have filed about it; the code’s page across every make has the whole file.
Common questions
Source: NHTSA files and the OBD-II standardIs B3924 a known problem on Cadillac vehicles?
It is a documented one: NHTSA's files hold 35 manufacturer filings and 0 owner reports naming B3924 on 21 Cadillac model years (2018–2025). Whether it is a problem on one particular car is a diagnosis, not a count — but a bulletin that names the code on your model year is the place to start.
Which Cadillac models does B3924 appear on most?
2025 XT5 (2 documents), 2024 XT5 (2 documents), 2023 XT5 (2 documents).
Does B3924 on a Cadillac mean it is recalled?
No. Recalls are filed by campaign and matched by VIN; no recall is triggered by a scan tool. Check the VIN at nhtsa.gov/recalls, or open the model year's page here for the campaigns filed against it.