JL4 ✓ Factory-verified

Hummer · Regular Production Option

Control, active brake

Years 2006–09 Models 2 Factory citations 3

Query this via API →

Also documented for BuickCadillacChevroletGMCOldsmobilePontiacSaturn

Documented applications

H2 and H2 SUT — GMT820 (2003–2009) →

• 2009 ✓ Factory-verified
  ⛭ GM factory document — 2009 hummer h2 rpo code list, p.1.

H3 and H3T — GMT345 (2006–2010) →

• 2006–2008 ✓ Factory-verified
  ⛭ GM factory document — 2006 hummer h3 rpo code list, p.1.

  ⛭ GM factory document — 2008 hummer h3 rpo code list, p.1.

This page aggregates every documented appearance of JL4 in the Hummer reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.