Chevrolet bulletin 20-NA-116
What it saysThis informational bulletin provides information on Available Top Speed Changes and how to reach them. NHTSA’s full summary ↓
Chevrolet filed this with NHTSA as a service bulletin dated Aug 14, 2023, received Feb 28, 2023, about the power train — 2 documents under this number. It names 6 model years (2019–2023). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis informational bulletin provides information on Available Top Speed Changes and how to reach them.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 20-NA-116 | Service bulletin | Aug 14, 2023 | 10242229 | PDF, 48 KB |
| 20-NA-116 | Service bulletin | Feb 13, 2023 | 10232151 | PDF, 498 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: 2019 Chevrolet 6500.
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 5 model years this bulletin names have filed 3,761 complaints with NHTSA since 2015. 2,740 of them name Engine, Power Train — 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.
On the 2019 Chevrolet Silverado, the 143 owners who gave an odometer reading for Engine reported it at a median of 71,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Vehicle continues to go into limp mode causing us to be stranded on the side of the road. It is related to DEF injection system issues. It sounds like this is a known issue with the software. We purchased the vehicle in August and have been unable to use the truck since purchasing as it continues to leave us stranded.
2023 Chevrolet Silverado · Engine · filed with NHTSA Jun 6, 2024 · ODI 11592815
The contact owns a 2022 Chevrolet Silverado 1500. The contact stated that the service transmission warning light was illuminated. The contact stated that the shift selector had seized. The contact called the local dealer where a service appointment was scheduled but the vehicle was not yet diagnosed nor repaired.
2022 Chevrolet Silverado · Power Train · filed with NHTSA Nov 15, 2022 · ODI 11493698
At cold start up, the truck immediately illuminated the check engine light with a message of reduced engine power. A shut down and restart produced the same results. Shut the truck off and pulled the trouble code P26BB. Next start up, check engine light was still on, but the reduced engine power message was gone.
2020 Chevrolet Silverado · Engine · filed with NHTSA May 5, 2020 · ODI 11323321
In depth: 2023 Chevrolet Silverado engine problems → · 2023 Chevrolet Silverado transmission and drivetrain problems → · 2022 Chevrolet Silverado engine problems → · 2022 Chevrolet Silverado transmission and drivetrain problems →
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 power train
Source: same model, same component group89 other manufacturer communications filed against these Chevrolet models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N252502891-01 | Service campaign | Aug 20, 2026 | Certain vehicles may have a condition in which the internal differential nut was cross threaded or missing during assembly. Dealers will rev… |
| N252517790 | Service campaign | Oct 14, 2025 | Certain vehicles, equipped with 8L80 or 8L90 Transmissions, may have a condition in which the reaction carrier cracks. Dealers are to replac… |
| N242454441 -03 | Service campaign | Oct 9, 2025 | Certain vehicles listed above, may have a condition where the transmission control valve has worn, resulting in a gradual loss of pressure w… |
| 25-NA-080 | Service bulletin | Sep 4, 2025 | This service bulletin provides a procedure to overhaul the control valve to replace a plate and worn down check ball to correct the customer… |
| N252494003-01 | Service campaign | Jun 26, 2025 | Certain vehicles listed above, may have a condition where the connecting rod and/or crankshaft engine components in these vehicles may have… |
| N242483540-01 | Service campaign | May 21, 2025 | Certain vehicles listed above may have a condition in which the transmission may not shift properly. Dealers are to replace the transmission… |
| 22-NA-182 | Service bulletin | May 16, 2025 | This service bulletin advises the technician to check if the transmission cooler lines are twisted to correct customer concerns of Harsh Shi… |
| 24-NA-133 | Service bulletin | May 14, 2025 | This informational bulletin provides information on Wheel Drive Shaft Retention Snap Ring Design Change. |
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-116 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-116 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. Every GM warranty extension on file lists the ones GM has filed.
Which vehicles does 20-NA-116 cover?
The manufacturer filed it against 6 model years: 2023 Chevrolet Silverado, 2022 Chevrolet Silverado, 2021 Chevrolet Silverado, 2020 Chevrolet Silverado, 2019 Chevrolet Silverado, 2019 Chevrolet 6500. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.