GM bulletin PIT5551K
What it saysThis Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jul 18, 2023, received Aug 21, 2023, about the forward collision avoidance. It names 147 model years across Chevrolet, GMC, Buick and Cadillac (2016–2023). 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.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC · Buick · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis Preliminary information communicates a "Forward Collision System Reduced" message displayed on the DIC when the Forward Automatic Braking has been set to the "Alert" setting. This is normal when the FAB has been set to "Alert".
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT5551K | Service bulletin | Jul 18, 2023 | 10240792 | not found |
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 65 model years
and 25 more on this site: 2020 Chevrolet Silverado 2500HD, 2023 Chevrolet Suburban, 2022 Chevrolet Suburban, 2021 Chevrolet Suburban, 2020 Chevrolet Suburban, 2019 Chevrolet Suburban, 2018 Chevrolet Suburban, 2017 Chevrolet Suburban, 2023 Chevrolet Tahoe, 2022 Chevrolet Tahoe, 2021 Chevrolet Tahoe, 2020 Chevrolet Tahoe, 2019 Chevrolet Tahoe, 2018 Chevrolet Tahoe, 2017 Chevrolet Tahoe, 2023 Chevrolet Traverse, 2022 Chevrolet Traverse, 2021 Chevrolet Traverse, 2020 Chevrolet Traverse, 2019 Chevrolet Traverse, 2018 Chevrolet Traverse, 2019 Chevrolet Volt, 2018 Chevrolet Volt, 2017 Chevrolet Volt, 2016 Chevrolet Volt.
GMC 37 model years
and 28 more on this site: 2022 GMC Canyon, 2021 GMC Canyon, 2020 GMC Canyon, 2019 GMC Canyon, 2018 GMC Canyon, 2017 GMC Canyon, 2016 GMC Canyon, 2023 GMC Hummer EV, 2023 GMC Sierra, 2022 GMC Sierra, 2021 GMC Sierra, 2019 GMC Sierra, 2018 GMC Sierra, 2017 GMC Sierra, 2020 GMC Sierra 2500HD, 2023 GMC Terrain, 2022 GMC Terrain, 2021 GMC Terrain, 2020 GMC Terrain, 2019 GMC Terrain, 2018 GMC Terrain, 2023 GMC Yukon, 2022 GMC Yukon, 2021 GMC Yukon, 2020 GMC Yukon, 2019 GMC Yukon, 2018 GMC Yukon, 2017 GMC Yukon.
Also filed against model years this site has no page for: 2022 GMC Hummer EV Pickup.
Buick 6 model years
Cadillac 39 model years
and 31 more on this site: 2016 Cadillac CT6, 2019 Cadillac CTS, 2018 Cadillac CTS, 2017 Cadillac CTS, 2016 Cadillac CTS, 2023 Cadillac Escalade, 2022 Cadillac Escalade, 2021 Cadillac Escalade, 2020 Cadillac Escalade, 2019 Cadillac Escalade, 2018 Cadillac Escalade, 2017 Cadillac Escalade, 2016 Cadillac Escalade, 2023 Cadillac XT4, 2022 Cadillac XT4, 2021 Cadillac XT4, 2020 Cadillac XT4, 2019 Cadillac XT4, 2023 Cadillac XT5, 2022 Cadillac XT5, 2021 Cadillac XT5, 2020 Cadillac XT5, 2019 Cadillac XT5, 2018 Cadillac XT5, 2017 Cadillac XT5, 2023 Cadillac XT6, 2022 Cadillac XT6, 2021 Cadillac XT6, 2020 Cadillac XT6, 2019 Cadillac XTS, 2018 Cadillac XTS.
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 146 model years this bulletin names have filed 26,134 complaints with NHTSA since 2015. 278 of them name Forward Collision Avoidance — 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.
Driving on freeway, vehicle in front slowed down and my vehicle detected vehicle in front slowing down only slowed, not stopping), so my vehicle immediately braked to a stop on the freeway. Concern vehicles behind me of rear end collision. Vehicle would not allow me to proceed until until my vehicle was at a complete stop.
2023 Cadillac XT4 · Forward Collision Avoidance · filed with NHTSA Mar 1, 2026
With cruise control activated, at least 10 times since I bought this expensive vehicle the automated emergency braking activated at highway speeds - causing the vehicle to full brake without warning and nearly causing an accident each time (handling risk and risk of being impacted from behind by a following vehicle).
2021 Chevrolet Suburban · Forward Collision Avoidance · filed with NHTSA Sep 19, 2022
Vehicle stops unexpectedly in parking lots (5-10mph) and on freeways (70-76mph). Speed ranges from 5 - 75 mph. Unexpected braking occurs for no reason. There are typically no obstructions or vehicles in front of the vehicle. It is most concerning when the vehicle automatically applies braking traveling at 70-76mph
2020 Cadillac Escalade · Forward Collision Avoidance · filed with NHTSA Jan 16, 2024
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 forward collision avoidance
Source: same model, same component group36 other manufacturer communications filed against these GM models under the same component group (forward collision avoidance), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N252500161-01 | Service campaign | Jul 23, 2025 | If the driver receives a “Driver Assist Unavailable” message, and SuperCruise is non-functional, all future OTA updates may fail. Dealers wi… |
| 25-NA-118 | Service bulletin | May 8, 2025 | This service bulletin provides information for the technicians to use a Customer Concern Verification sheet to facilitate the questions need… |
| 24-NA-138 | Service bulletin | May 7, 2025 | This service bulletin provides repair information to correct a customer concern of Forward Collision Alert Unavailable DIC Message with U300… |
| 25-NA-070 | Service bulletin | Mar 21, 2025 | This service bulletin provides information on Super Cruise IME Recognition. |
| 25-NA-060 | Service bulletin | Mar 11, 2025 | This service bulletin provides information for dealers/technicians on Diagnostic Aid - Super Cruise Unavailable. |
| PIT6325A | Service bulletin | Feb 25, 2025 | This Preliminary information communicates a issue with the forward camera that causes a Forward Collision Unavailable Message With DTC U3000… |
| 25-NA-006 | Service bulletin | Jan 15, 2025 | This technical bulletin provides a procedure to correct the condition of Super Cruise Unavailable Message with DTC U1615 Set or Stored. |
| PIT6185A | Service bulletin | Jan 14, 2025 | This Preliminary information communicates information to reprogram the Frontview Camera Module for the AEB forward collision icon lamp illum… |
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, Buick and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM PIT5551K 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 PIT5551K 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 PIT5551K cover?
The manufacturer filed it against 147 model years across 4 brands (Chevrolet, GMC, Buick and Cadillac): 2023 Buick Enclave, 2022 Buick Enclave, 2021 Buick Enclave, 2020 Buick Enclave, 2019 Buick Enclave, 2018 Buick Enclave and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.