Chevrolet bulletin PIT6173
What it saysThis Preliminary information communicates a diagnostic tip to inform dealership technician on how to reset/learn the BPP sensor in the Powertrain Interface Module (PIM) NHTSA’s full summary ↓
Chevrolet filed this with NHTSA as a service bulletin dated Aug 13, 2024, about the electrical system. It names 8 model years (2020–2024). 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 Preliminary information communicates a diagnostic tip to inform dealership technician on how to reset/learn the BPP sensor in the Powertrain Interface Module (PIM)
Trouble codes it names: C0277 C2077 all 2 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6173 | Service bulletin | Aug 13, 2024 | 11006305 | PDF, 171 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; 2020 Chevrolet 4500HD; 2021 Chevrolet 4500HD; 2022 Chevrolet 4500HD; 2023 Chevrolet 4500HD.
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 3 model years this bulletin names have filed 116 complaints with NHTSA since 2015. 25 of them name 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.
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 · ODI 11627812
The contact owns a 2022 Chevrolet Silverado 3500. The contact stated that while driving 35 MPH with a trailer hitched to the vehicle, the trailer brake failed to respond on and off independently. Neither an independent mechanic nor a dealer was contacted. The trailer brake failure warning light was illuminated.
2022 Chevrolet Silverado 3500HD · Electrical System · filed with NHTSA Jun 16, 2026 · ODI 11744609
The contact owns a 2020 Chevrolet Silverado 3500. The contact stated while driving at an undisclosed speed, the service brake warning light illuminated. Additionally, the contact stated that the failure had occurred while the trailer was hitched to the vehicle.
2020 Chevrolet Silverado 3500HD · Electrical System · filed with NHTSA Jun 24, 2025 · ODI 11668859
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 group110 other manufacturer communications filed against these Chevrolet 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 |
|---|---|---|---|
| 18-NA-180 | Service bulletin | Sep 4, 2025 | This Warranty Administration service bulletin provides Lithium-Ion battery Exchange Process and Transaction Submission information. |
| 25-NA-121 | Service bulletin | May 13, 2025 | This service bulletin provides information on the radio software related issues to update the radio to the latest software version Y177. |
| 25-NA-119 | Service bulletin | May 9, 2025 | This service bulletin provides information on the Service Safety Restraint Message displayed on the DIC Airbag malfunction indicator illumin… |
| 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… |
| 21-NA-166 | Service bulletin | Apr 15, 2025 | This informational bulletin provides information on the turn signal stalk not cancelling and/or mis cancelling. |
| 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… |
| 23-NA-066 | Service bulletin | Apr 9, 2025 | This service bulletin refers the technician to Recall N242438501, and if closed, refer to SI to correct the condition of Malfunction Indicat… |
| 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… |
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 PIT6173 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 PIT6173 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 PIT6173 cover?
The manufacturer filed it against 8 model years: 2022 Chevrolet Silverado 3500HD, 2021 Chevrolet Silverado 3500HD, 2020 Chevrolet Silverado 3500HD, 2024 Chevrolet 3500HD, 2020 Chevrolet 4500HD, 2021 Chevrolet 4500HD and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.