Chevrolet bulletin 20-NA-051
What it saysThis informational bulletin provides information on the Low Cab Forward trucks and the Alpine Radio Exchange Program. NHTSA’s full summary ↓
Chevrolet filed this with NHTSA as a service bulletin dated Apr 30, 2025, received Aug 3, 2022, about the equipment — 5 documents under this number. It names 58 model years (2016–2026). 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.
Get the next Chevrolet Silverado 3500HD bulletin by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis informational bulletin provides information on the Low Cab Forward trucks and the Alpine Radio Exchange Program.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 20-NA-051 | Service bulletin | Apr 30, 2025 | 11019727 | PDF, 204 KB |
| 20-NA-051 | Service bulletin | Sep 15, 2023 | 10243748 | PDF, 72 KB |
| 20-NA-051 | Service bulletin | May 15, 2023 | 10236345 | PDF, 111 KB |
| 20-NA-051 | Service bulletin | Oct 13, 2022 | 10224837 | PDF, 126 KB |
| 20-NA-051 | Service bulletin | Jul 21, 2022 | 10217051 | PDF, 110 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.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2024 Chevrolet 3500HD; 2016 Chevrolet 4500; 2017 Chevrolet 4500; 2018 Chevrolet 4500; 2019 Chevrolet 4500; 2020 Chevrolet 4500; 2022 Chevrolet 4500; 2017 Chevrolet 4500HD; 2018 Chevrolet 4500HD; 2019 Chevrolet 4500HD; 2020 Chevrolet 4500HD; 2021 Chevrolet 4500HD; 2022 Chevrolet 4500HD; 2023 Chevrolet 4500HD; 2017 Chevrolet 4500XD; 2018 Chevrolet 4500XD; 2019 Chevrolet 4500XD; 2020 Chevrolet 4500XD; 2021 Chevrolet 4500XD; 2022 Chevrolet 4500XD; 2017 Chevrolet 5500HD; 2018 Chevrolet 5500HD; 2019 Chevrolet 5500HD; 2020 Chevrolet 5500HD; 2021 Chevrolet 5500HD; 2022 Chevrolet 5500HD; 2023 Chevrolet 5500HD; 2018 Chevrolet 5500XD; 2019 Chevrolet 5500XD; 2020 Chevrolet 5500XD; 2021 Chevrolet 5500XD; 2022 Chevrolet 5500XD; 2019 Chevrolet 6500HD; 2020 Chevrolet 6500HD; 2021 Chevrolet 6500HD; 2022 Chevrolet 6500HD; 2023 Chevrolet 6500HD; 2018 Chevrolet C3500; 2016 Chevrolet LOW Cab Forward 3500; 2017 Chevrolet LOW Cab Forward 3500; 2018 Chevrolet LOW Cab Forward 3500; 2019 Chevrolet LOW Cab Forward 3500; 2026 Chevrolet LOW Cab Forward 3500; 2016 Chevrolet LOW Cab Forward 4500; 2017 Chevrolet LOW Cab Forward 4500; 2016 Chevrolet LOW Cab Forward 5500; 2017 Chevrolet LOW Cab Forward 5500; 2026 Chevrolet LOW Cab Forward 5500; 2018 Chevrolet LOW Cab Forward 6500; 2026 Chevrolet LOW Cab Forward 6500; 2025 Chevrolet LOW Cab Forward N Series.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new Chevrolet bulletins for the Silverado 3500HD
A weekly email, sent only in a week when Chevrolet files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 7 model years this bulletin names have filed 230 complaints with NHTSA since 2015. 43 of them name Electrical System, Equipment — 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.
There is a common and very dangerous electrical wire routing problem on my vehicle, along with 3 dozen others and my dads (separate but same truck) i confirmed with (FB group for owners of 17-19 L5P GMC diesel trucks) where the alternator positive wire from the alternator to the battery is run right along and across a rather sharp part…
2019 Chevrolet Silverado 3500HD · Electrical System · filed with NHTSA Oct 29, 2025
Electrical components are failing in the tailgate lock/unlock mechanism. The tailgate goes up and down on its own while in park. It will also go up and down on its own after the truck is off and unattended This started happening about a week ago. It is available for inspection upon request and has not been inspected by any agency yet.
2021 Chevrolet Silverado 3500HD · Electrical System · filed with NHTSA Nov 27, 2024
The contact owned a 2018 Chevrolet Silverado 3500 Commercial Vehicle. The contact received notifications of NHTSA Campaign Numbers: 21V496000 (Equipment) and 23V047000(Fuel System, Diesel) and would like to be removed from the recall distribution list because the vehicle was totaled. The manufacturer was contacted
2018 Chevrolet Silverado 3500HD · Equipment · filed with NHTSA Jan 28, 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 group54 other manufacturer communications filed against these Chevrolet 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. |
| 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. |
| 21-NA-091 | Service bulletin | Dec 21, 2024 | This service bulletin provides information for customers/dealers/technicians on Normal Camera Display Operation - Flashing Diamond - Spot… |
| 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, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Chevrolet 20-NA-051 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 20-NA-051 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 20-NA-051 cover?
The manufacturer filed it against 58 model years: 2022 Chevrolet Silverado 3500HD, 2021 Chevrolet Silverado 3500HD, 2020 Chevrolet Silverado 3500HD, 2019 Chevrolet Silverado 3500HD, 2018 Chevrolet Silverado 3500HD, 2017 Chevrolet Silverado 3500HD and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.