# Service bulletin PIC6661

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11036393
- Published by NHTSA: 2026\-08\-27
- Manufacturer's number: PIC6661
- Manufacturer's date: 2026\-08\-20
- NHTSA component: UNKNOWN OR OTHER

## NHTSA's summary

This Preliminary information communicates to the technician a diagnostic tip when they encounter a condition that involves the tail lights staying on after the vehicle has been turned off.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036393-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11036393-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Vehicles listed

- 2025 to 2027 CADILLAC OPTIQ

JSON: [/v1/bulletins/11036393](/v1/bulletins/11036393)

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