Cadillac bulletin PIC6658
Cadillac filed this with NHTSA as a service bulletin dated Aug 4, 2026, received Aug 14, 2026, about the unknown or other. It names 7 model years (2026–2027). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis preliminary information informs customers and technicians of the short term work around to restore the proper Themes operation. No parts should be replaced at this time.
Document filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| PIC6658 | Service bulletin | Aug 4, 2026 | 11036197 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. 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. Quote it 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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Cadillac PIC6658 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 PIC6658 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 PIC6658 cover?
The manufacturer filed it against 7 model years: 2026 Cadillac CT5, 2027 Cadillac Lyriq, 2026 Cadillac Lyriq, 2027 Cadillac Optiq, 2026 Cadillac Optiq, 2027 Cadillac Vistiq and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.