5L5 ✓ Factory-verified

Chevrolet · Regular Production Option

Theft deterrent system, fleet immobilizer modifications

Years 2023, 2025–27 Models 2 Factory citations 4

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Also documented for GMC

Documented applications

Express — GMT610 (2003–2027) →

• 2023 ✓ Factory-verified
  ⛭ GM factory document — 2023 chevrolet 23 express savana body builder sm en us 2022sep13, p.12.

Silverado HD (T1XX, 2020–2027) →

• 2025–2027 ✓ Factory-verified

  only in: 2500 HD, 3500 HD, 3500 HD chassis cab

  ⛭ GM factory document — 2025 chevrolet silverado 3500 hd cc fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2026 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

  ⛭ GM factory document — 2027 chevrolet silverado 2500 hd retail and fleet fleet order guide rpo codes, p.1.

This page aggregates every documented appearance of 5L5 in the Chevrolet reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.