ISA ✓ Factory-verified

GMC · Regular Production Option

Speed limit assist, automatic

Years 2025 Models 1 Factory citations 2

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Also documented for Chevrolet

Documented applications

Sierra EV — BT1 (2024–2027) →

• 2025 ✓ Factory-verified

  no longer included on vehicles built after 10/14/2024

  ⛭ GM factory document — 2025 gmc sierra ev denali fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2025 gmc sierra ev denali fleet order guide, p.1.

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