U1121 on Chevrolet vehicles
U1121 is named on 6 Chevrolet model years (2021–2023): 40 manufacturer filings and 1 owner report in NHTSA’s files, across Suburban, Tahoe.
Which Chevrolet model years name U1121
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports |
|---|---|---|---|
| 2021 Chevrolet Suburban | Equipment | 11 | — |
| 2021 Chevrolet Tahoe | Electrical System | 11 | — |
| 2023 Chevrolet Tahoe | Air Bags | 4 | 1 |
| 2022 Chevrolet Suburban | Visibility/Wiper | 5 | — |
| 2022 Chevrolet Tahoe | Power Train | 5 | — |
| 2023 Chevrolet Suburban | Air Bags | 4 | — |
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.
What Chevrolet owners said
Source: NHTSA complaint databaseOwners’ own words, scrubbed of anything identifying. Unverified reports filed with NHTSA — what was said, not a finding that it was true.
Overhead roof console inoperative/service safety/ restrain system/ sunroof inoperative/ dome lights inoperative/ dtcs B1A7A and U1121
Chevrolet filings that name U1121
Source: NHTSA manufacturer communicationsBulletins and campaigns Chevrolet filed with NHTSA whose summary names U1121. Quote the document number at the service desk — it is a diagnosis the maker has already written down.
- PIT5774 Service bulletin2020-09-14 · Electrical System
- This Preliminary information communicates an issue with: Overhead Console Inoperative / Service Safety Restraints Message / Sunroof Inoperative / DTC's B1A7A and U1121. Dealers are to cycle the power to the overhead console to correct the issue. Engineering working on releasing new overhead console.
- PIT5774A Service bulletin2021-07-26 · Equipment
- This Preliminary information communicates an issue with: Overhead Console Inoperative / Service Safety Restraints Message / Sunroof Inoperative / DTC's B1A7A and U1121. Dealers are to cycle the power to the overhead console to correct the issue. Engineering has released updated roof consoles to correct this concern. Dealers are to replace the roof console.
- PIT5774B Service bulletin2021-08-16 · Equipment
- This Preliminary information communicates an issue with: Overhead Console Inoperative / Service Safety Restraints Message / Sunroof Inoperative / DTC's B1A7A and U1121. Dealers are to cycle the power to the overhead console to correct the issue. Engineering has released updated roof consoles to correct this concern. Dealers are to replace the roof console.
- PIT5949 Service bulletin2022-09-27 · Air Bags
- This Preliminary information communicates an issue during start up that the following symptoms occur: - Service Safety Restraints System Message - Sunroof Inoperative - Sunshade Lights Inoperative - Dome Lights Inoperative - Power Liftgate Inoperative when using switch in overhead console - DTCs U1121 set in the BCM and B1A7A set in the Restraints Module Engineering is currently working
- PIT5949A Service bulletin2023-01-25 · Visibility — Sun/Moon Roof Assembly
- This Preliminary information communicates an issue during start up that the following symptoms occur: - Service Safety Restraints System Message - Sunroof Inoperative - Sunshade Lights Inoperative - Dome Lights Inoperative - Power Liftgate Inoperative when using switch in overhead console - DTCs U1121 set in the BCM and B1A7A set in the Restraints Module Engineering is currently working
- PIT5949B Service bulletin2023-04-04 · Electrical System
- This Preliminary information communicates an issue during start up that the following symptoms occur: - Service Safety Restraints System Message - Sunroof Inoperative - Sunshade Lights Inoperative - Dome Lights Inoperative - Power Liftgate Inoperative when using switch in overhead console - DTCs U1121 set in the BCM and B1A7A set in the Restraints Module Engineering is currently working
What U1121 means
Source: SAE J2012 / OBD-IIU1121 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 Chevrolet 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 U1121 a known problem on Chevrolet vehicles?
It is a documented one: NHTSA's files hold 40 manufacturer filings and 1 owner report naming U1121 on 6 Chevrolet model years (2021–2023). 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 Chevrolet models does U1121 appear on most?
2021 Suburban (11 documents), 2021 Tahoe (11 documents), 2022 Suburban (5 documents).
Does U1121 on a Chevrolet 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.