GM bulletin 21-NA-195
What it saysThis service bulletin advises the technician of a new routing for the ABS sensor harness if the part was received with a shorter harness. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jan 4, 2024, received Jan 19, 2024, about the electrical system. It names 4 model years across Chevrolet and GMC (2020–2021). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin advises the technician of a new routing for the ABS sensor harness if the part was received with a shorter harness.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 21-NA-195 | Service bulletin | Jan 4, 2024 | 10249003 | PDF, 81 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 themChevrolet 2 model years
GMC 2 model years
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 4 model years this bulletin names have filed 33 complaints with NHTSA since 2015. 9 of them name Service Brakes, Electrical System — 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 2021 Chevrolet Express. The contact stated that while driving at an undisclosed speed, the vehicle started to pull to the left, prompting the contact to pull over to the shoulder off the roadway. After a visual inspection, the contact stated there was smoke coming from the driver's side front brakes.
2021 Chevrolet Express · Service Brakes · filed with NHTSA Mar 5, 2025 · ODI 11646583
The contact owns a 2021 Chevrolet Express 3500. The contact stated that while driving 30 MPH, there was a burning odor coming from the vehicle, and the vehicle was pulled over into the right lane. Upon exiting the vehicle, the contact became aware that the front wheels were smoking.
2021 Chevrolet Express · Electrical System · filed with NHTSA Mar 16, 2026 · ODI 11724714
After purchasing a used vehicle 2020 model, and after setting in owner's garage for two weeks, the vehicle was driven at slow speed thru two intersections after a complete stop. at the third intersection stopsign the vehicle started moving slowly with the brake on.
2020 Chevrolet Express · Service Brakes · filed with NHTSA May 26, 2022 · ODI 11466204
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 electrical system
Source: same model, same component group46 other manufacturer communications filed against these GM models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 24-NA-166 | Service bulletin | Nov 7, 2025 | This technical bulletin provides repair information to correct a customer concern of DTC C1171 C1172 C1173 C1174 Tire Pressure Monitor Senso… |
| 22-NA-242 | Service bulletin | Apr 24, 2025 | This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector Reconnect Labor Code Number… |
| 24-NA-229 | Service bulletin | Apr 10, 2025 | This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system tha… |
| 25-NA-087 | Service bulletin | Apr 3, 2025 | This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs… |
| 13-08-116-001K | Service bulletin | Mar 31, 2025 | The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple custo… |
| 24-NA-098 | Service bulletin | Mar 21, 2025 | This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E440… |
| 15-06-03-001F | Service bulletin | Mar 12, 2025 | This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and te… |
| 23-NA-064 | Service bulletin | Jan 29, 2025 | This service bulletin provides information on the Transport Mode Feature, also known as Logistics mode, which is used to increase the 12V Ba… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet and GMC, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 21-NA-195 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-195 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 21-NA-195 cover?
The manufacturer filed it against 4 model years across 2 brands (Chevrolet and GMC): 2021 Chevrolet Express, 2020 Chevrolet Express, 2021 GMC Savana, 2020 GMC Savana. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.