CT4 ✓ Factory-verified

GMC · Regular Production Option

Country code: Luxembourg

Years 1999–00 Models 2 Factory citations 3

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Also described as Country code, Luxembourg

Also documented for ChevroletHummer

Documented applications

Sierra — GMT800 (1999–2007) →

• 1999–2000 ✓ Factory-verified internal
  ⛭ GM factory document — 1999 gmc gmc c sierra 2wd rpo code list, p.1.

  ⛭ GM factory document — 2000 gmc gmc c sierra 2wd rpo code list, p.1.

Yukon — GMT800 (2000–2006) →

• 2000 ✓ Factory-verified internal
  ⛭ GM factory document — 2000 gmc yukon 2wd rpo code list, p.1.

This page aggregates every documented appearance of CT4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.