QTZ ✓ Factory-verified

GMC · Regular Production Option

Tires, LT285/75R18E, all-terrain blackwall

Years 2026–27 Models 1 Factory citations 4

Query this via API →

Also documented for Chevrolet

Documented applications

Sierra EV — BT1 (2024–2027) →

• 2026–2027 ✓ Factory-verified

  2026: S in 4SC, 4SD; not offered in 3SB, 3SC, 5SB, 5SC, 5SD; 2027: S in 4SC, 4SD; not offered in 3SB, 3SC, 5SC, 5SD

  ⛭ GM factory document — 2026 gmc sierra ev fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 gmc sierra ev fleet order guide, p.10.

  ⛭ GM factory document — 2027 gmc sierra ev fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 gmc sierra ev fleet order guide, p.10.

Related codes · mentioned in these notes

3SB3SC4SC4SD5SB5SC5SD

This page aggregates every documented appearance of QTZ in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.