TSB 661.10 — Buick, Cadillac, Chevrolet and GMC Software update

661.10 is a software update filed with NHTSA by Buick, Cadillac, Chevrolet and GMC, covering 15 Buick, Cadillac, Chevrolet and GMC models across the 2022–2027 model years. NHTSA's summary reads: • Fixes to help ensure proper functionality for heating and cooling features. • Improvements to night mode lights for shifting gears. • Fixes for Daytime Running Lamps turning on when set to Off. • Fixes to help prevent erroneous missing key messages on driver display. • Fixes…

NHTSA's file names Buick Enclave (2024–2026); Cadillac Escalade (2023–2024, 2026); Chevrolet Bolt EV (2027); Chevrolet Colorado (2024–2026); Chevrolet Equinox (2025–2026); Chevrolet Silverado 1500 (2022–2025); Chevrolet Silverado 2500 (2024); Chevrolet Suburban (2023–2024, 2026); Chevrolet Tahoe (2023–2024, 2026); Chevrolet Traverse (2024–2026), and 5 more vehicles listed on this page. A bulletin number can be re-issued against more vehicles later, so check the model-year list on this page against your own.

661.10 is filed as a software update, not a recall — but this is the kind of communication that can mean free or reimbursed work if your VIN qualifies. Take the number to a dealer and ask. Recalls are separate and always free; check yours by VIN at nhtsa.gov/recalls.

Take the document ID to a dealer's service desk, or search NHTSA's manufacturer-communications records. This page carries every document ID filed under 661.10, its date, and NHTSA's own summary from the public file.