Cadillac bulletin PIE0778A
What it saysThis engineering information (EI) closure ends the need for gathering further information from technicians in regard to steering loss of assist while driving. NHTSA’s full summary ↓
Cadillac filed this with NHTSA as a service bulletin dated May 23, 2024, received Jun 18, 2024, about the steering. It names 2 model years (2023–2024). 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 engineering information (EI) closure ends the need for gathering further information from technicians in regard to steering loss of assist while driving.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PIE0778A | Service bulletin | May 23, 2024 | 11001779 | PDF, 56 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 themA 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 2 model years this bulletin names have filed 113 complaints with NHTSA since 2015.
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 steering
Source: same model, same component group9 other manufacturer communications filed against the Cadillac Lyriq under the same component group (steering), newest first. The eight newest are listed; the rest are on the Cadillac list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 25-NA-116 | Service bulletin | May 10, 2025 | This service bulletin provides information and the condition correction on the "Service Steering Column Lock" message and/or those who are u… |
| PI0281L | Service bulletin | Apr 17, 2025 | This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody comp… |
| 25-NA-065 | Service bulletin | Mar 21, 2025 | This informational bulletin instructs the tech when fuel/fluid is needed to be tested and where it can be sent for analysis. |
| 16-NA-109 | Service bulletin | Feb 18, 2025 | This technical bulletin provides a procedure inspecting for excess grease or Sealant on the Exterior of the steering gear due to seeing grea… |
| N242452110 | Service campaign | Dec 4, 2024 | Service Update. On certain vehicles, while Super Cruise is engaged, DTC B19F2 (steering wheel touch sensor fault) could occur. Dealers will… |
| PIC6493A | Service bulletin | Aug 17, 2023 | This Preliminary information communicates that the steering wheel maybe contacting the column covers and to inspect for the turn signal swit… |
| 15-00-89-004F | Service bulletin | Aug 7, 2023 | This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak… |
| PIE0752 | Service bulletin | May 25, 2023 | This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer lis… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Cadillac PIE0778A 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 PIE0778A 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 PIE0778A cover?
The manufacturer filed it against 2 model years: 2024 Cadillac Lyriq, 2023 Cadillac Lyriq. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.