GM bulletin 21-NA-091
What it saysThis service bulletin provides information for customers/dealers/technicians on Normal Camera Display Operation - Flashing Diamond - Spot - or UFO like image on Camera Display. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Dec 21, 2024, received Feb 8, 2023, about the equipment — 2 documents under this number. It names 60 model years across Chevrolet, GMC and Cadillac (2020–2025). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides information for customers/dealers/technicians on Normal Camera Display Operation - Flashing Diamond - Spot - or UFO like image on Camera Display.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-091 | Service bulletin | Dec 21, 2024 | 11012908 | PDF, 159 KB |
| 21-NA-091 | Service bulletin | Jan 30, 2023 | 10231520 | PDF, 91 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
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Model years it names
Source: as the manufacturer filed themChevrolet 25 model years
GMC 16 model years
and 1 more on this site: 2020 GMC Yukon.
Cadillac 19 model years
and 11 more on this site: 2022 Cadillac CT5, 2021 Cadillac CT5, 2020 Cadillac CT5, 2023 Cadillac Escalade, 2022 Cadillac Escalade, 2021 Cadillac Escalade, 2020 Cadillac Escalade, 2023 Cadillac XT4, 2022 Cadillac XT4, 2021 Cadillac XT4, 2020 Cadillac XT4.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 60 model years this bulletin names have filed 9,404 complaints with NHTSA since 2015. 3 of them name Back Over Prevention — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
The contact owns a 2023 GMC Sierra 2500. The contact stated that while the vehicle was in reverse(R), the split-screen view of the overhead of the vehicle and the rear of the vehicle were distorted or was not showing an image on the display screen. The contact stated that the failure was intermittent but was a recurring failure.
2023 GMC Sierra 2500HD · Back Over Prevention · filed with NHTSA Oct 18, 2024
My vehicle was sold as EQUIPPED W/ FRONT/REAR PARK ASSIST; INCLUDES LATER RETROFIT printed on the window sticker . I took delivery nearly 2 years ago and this safety retrofit has still not been completed . I have reached out to GM customer service who provides vague excuses and no further information for repair.
2022 Chevrolet Suburban · Back Over Prevention · filed with NHTSA Jun 30, 2023
The contact owns a 2021 GMC Sierra 3500. The contact stated that while reversing, the back over prevention camera screen displayed an image of the ground. The contact stated that the image was approximately ten feet behind the vehicle. The vehicle was taken to the dealer; however, the failure was not duplicated.
2021 GMC Sierra 3500HD · Back Over Prevention · filed with NHTSA Aug 14, 2025
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the equipment
Source: same model, same component group169 other manufacturer communications filed against these GM models under the same component group (equipment), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIT6504 | Service bulletin | Apr 1, 2026 | This preliminary information communicates a normal characteristic where Some customers may comment that they have a " Forward Collision Unav… |
| PIP5601B | Service bulletin | Jul 18, 2025 | This Preliminary Information communication provides information to the technician about vibration complaints that are one of the most challe… |
| 22-NA-161 | Service bulletin | May 17, 2025 | This informational bulletin provides information for dealers/technicians on power folding mirrors do not fold at the same speed. |
| 20-NA-051 | Service bulletin | Apr 30, 2025 | This informational bulletin provides information on the Low Cab Forward trucks and the Alpine Radio Exchange Program. |
| 22-NA-096 | Service bulletin | Mar 29, 2025 | This informational bulletin provides information for dealers/technicians on Customer Education Bulletin for Google Built In Radio. |
| 17-NA-073 | Service bulletin | Mar 5, 2025 | This warranty administration bulletin provides policy information with the field action courtesy transportation policy. |
| 22-NA-038 | Service bulletin | Dec 14, 2024 | This warranty bulletin provides information on Customer Concern Not Duplicated (CCND) Labor Operation Numbers. |
| 18-NA-263 | Service bulletin | Dec 14, 2024 | This warranty administration bulletin provides policy information for variable diagnostic time allowances on select labor operations… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, GMC and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 21-NA-091 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 21-NA-091 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 21-NA-091 cover?
The manufacturer filed it against 60 model years across 3 brands (Chevrolet, GMC and Cadillac): 2025 Cadillac CT4, 2024 Cadillac CT4, 2023 Cadillac CT4, 2022 Cadillac CT4, 2021 Cadillac CT4, 2020 Cadillac CT4 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.