MT1 ✓ Factory-verified

Hummer · Regular Production Option

Transmission, automatic, 4 speed, with electronic controls, heavy duty, Hydra-Matic 4L80-E

Years 2003 Models 1 Factory citations 1

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Also documented for ChevroletGMC

Documented applications

H2 and H2 SUT — GMT820 (2003–2009) →

• 2003 ✓ Factory-verified

  2003 only.

  ⛭ GM factory document — 2003 hummer h2 rpo code list, p.1.

This page aggregates every documented appearance of MT1 in the Hummer reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.