U1518 on Cadillac vehicles
U1518 is named on 14 Cadillac model years (2019–2023): 42 manufacturer filings and 0 owner reports in NHTSA’s files, across XT4, XT5, XT6.
Which Cadillac model years name U1518
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2021 Cadillac XT4 | Electrical System | 4 | — |
| 2021 Cadillac XT5 | Electrical System | 4 | — |
| 2021 Cadillac XT6 | Electrical System | 4 | — |
| 2020 Cadillac XT4 | Electrical System | 4 | — |
| 2020 Cadillac XT5 | Electrical System | 4 | — |
| 2020 Cadillac XT6 | Electrical System | 4 | — |
| 2022 Cadillac XT4 | Equipment | 3 | — |
| 2022 Cadillac XT5 | Electrical System | 3 | — |
| 2022 Cadillac XT6 | Electrical System | 3 | — |
| 2019 Cadillac XT4 | Electrical System | 3 | — |
| 2019 Cadillac XT5 | Electrical System | 3 | — |
| 2023 Cadillac XT4 | Equipment | 1 | — |
| 2023 Cadillac XT5 | Equipment | 1 | — |
| 2023 Cadillac XT6 | Equipment | 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 U1518
Source: NHTSA manufacturer communicationsBulletins and campaigns Cadillac filed with NHTSA whose summary names U1518. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- 21NA127 Service bulletin2021-06-01 · Electrical System — Adas — Hud — Software
- This technical bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U1518 Set.
- 21-NA-127 Service bulletin2022-05-25 · Unknown Or Other
- This service bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U1518 Set.
- 21NA127 Service bulletin2022-01-21 · Electrical System — Software
- This technical bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U1518 Set.
- 21-NA-127 Service bulletin2023-01-20 · Equipment
- This service bulletin provides repair information to correct a customer concern of Head Up Display (HUD) Blank, Non-Responsive to Brightness, Aim, or Page Controls, DTC U1518 Set.
What U1518 means
Source: SAE J2012 / OBD-IIU1518 is a manufacturer-specific code: the second character is a 1, 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 U1518 a known problem on Cadillac vehicles?
It is a documented one: NHTSA's files hold 42 manufacturer filings and 0 owner reports naming U1518 on 14 Cadillac model years (2019–2023). 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 U1518 appear on most?
2021 XT4 (4 documents), 2020 XT4 (4 documents), 2021 XT5 (4 documents).
Does U1518 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.