Cadillac Vistiq 2026 — technical service bulletin
Bulletin 654.21 · NHTSA communication 11027918 · issued Jan 16, 2026
Technical service bulletin
communication type
Unknown / Other
component
2026
model years
1
vehicle entries
Official summary
• Improvements to help protect battery health in low temperatures. • Improvements to diagnostics to reduce service messages. • Fixes to help protect battery health in high temperatures. • Fixes to improve responsiveness for vehicle diagnostics.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.