- 2025–2026 Factory-verified
Preferred, Sport Touring: O; includes driver 8-way power seat adjuster (A2X), 2-way power driver lumbar control (AL9), heated front seats (KA1), heated steering wheel (UVD) and Keyless Open (AVJ), plus wrapped flat-bottom steering wheel (N5E) on Preferred; included with Studio Series in 2026
ZL4 Factory-verified
Also documented for ChevroletGMC
Documented applications
This page aggregates every documented appearance of ZL4 in the Buick reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.