C77 ✓ Factory-verified

GMC · Regular Production Option

Air vents, rear console

Years 2025–26 Models 2 Factory citations 6

Query this via API →

Also documented for Cadillac

Documented applications

Hummer EV Pickup (2022–2027) →

• 2025–2026 ✓ Factory-verified
  ⛭ GM factory document — 2025 gmc hummer ev pickup fleet order guide rpo codes, p.1.

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

  ⛭ GM factory document — 2025 gmc hummer ev pickup fleet order guide, p.1.

  ⛭ GM factory document — 2026 gmc hummer ev pickup fleet order guide, p.1.

Hummer EV SUV — BT1 (2024–2027) →

• 2025–2026 ✓ Factory-verified

  the 2025 guide adds forced air to the wording.

  ⛭ GM factory document — 2025 gmc hummer ev suv fleet order guide, p.1.

  ⛭ GM factory document — 2026 gmc hummer ev suv fleet order guide, p.1.

This page aggregates every documented appearance of C77 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.