GM bulletin PIT6186C
What it saysThis Preliminary information communicates that a customer may see a Super Cruise Unavailable message with multiple codes setting and Engineering is working on a resolution. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 25, 2024, received Dec 5, 2024, about the forward collision avoidance. It names 7 model years across Chevrolet and GMC (2024–2025). 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 Preliminary information communicates that a customer may see a Super Cruise Unavailable message with multiple codes setting and Engineering is working on a resolution.
Trouble codes it names: B0126 B1DD0 U023B U053C U1624 all 5 read from the document itself; NHTSA’s summary names none
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIT6186C | Service bulletin | Oct 25, 2024 | 11011468 |
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.
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Model years it names
Source: as the manufacturer filed themChevrolet 4 model years
GMC 3 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 7 model years this bulletin names have filed 1,109 complaints with NHTSA since 2015. 73 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.
The contact owns a 2025 Chevrolet Suburban. The contact stated that the "Adaptive Cruise Control Temporarily Unavailable" message was displayed on the instrument panel. The vehicle was taken to a local dealer where the vehicle was diagnosed, and the contact was advised that the radar was faulty and needed to be replaced.
2025 Chevrolet Suburban · Forward Collision Avoidance · filed with NHTSA Jul 24, 2025
The issue is related to Super Cruise hands free driving. During a recent long trip multiple times the Super Cruise signaled for lane change and tried to move into the passing lane with a car directly beside me.
2025 Chevrolet Tahoe · Forward Collision Avoidance · filed with NHTSA May 11, 2026
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 group15 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 |
|---|---|---|---|
| 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… |
| 25-NA-060 | Service bulletin | Mar 11, 2025 | This service bulletin provides information for dealers/technicians on Diagnostic Aid - Super Cruise Unavailable. |
| PIT6186D | Service bulletin | Dec 16, 2024 | This Preliminary information communicates that a customer may see a Super Cruise Unavailable message with multiple codes setting and Enginee… |
| PIC6556G | Service bulletin | Dec 6, 2024 | This Preliminary information communicates to check the drivers monitoring camera for a B1DD0 SYM57 or B0126 SYM82 setting with no other DTCs… |
| PIT6289 | Service bulletin | Nov 21, 2024 | This Preliminary information communicates information that Engineering is aware of a concern where the collision / detection alert changes f… |
| PIT6268 | Service bulletin | Oct 29, 2024 | This Preliminary information communicates where the driver is unable to activate Super Cruise along with a DIC message stating "Super Cruise… |
| 24-NA-034 | Service bulletin | Oct 12, 2024 | This service bulletin provides information for dealers/technicians on Grunt Noise with Adaptive Cruise or One-Pedal Drive. |
| PIT6186B | Service bulletin | Oct 10, 2024 | This Preliminary information communicates that a customer may see a Super Cruise Unavailable message with multiple codes setting and Enginee… |
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 PIT6186C 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 PIT6186C 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 PIT6186C cover?
The manufacturer filed it against 7 model years across 2 brands (Chevrolet and GMC): 2025 Chevrolet Silverado, 2024 Chevrolet Silverado, 2025 Chevrolet Suburban, 2025 Chevrolet Tahoe, 2025 GMC Sierra, 2024 GMC Sierra and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.