2K3 ✓ Factory-verified

GMC · Regular Production Option

Exhaust, 2008 carryover system, LMM diesel heavy-duty pickups at start of regular production

Years 2009 Models 1 Factory citations 1

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Also documented for Chevrolet

Documented applications

Sierra HD — GMT900 (2007–2014) →

• 2009 ✓ Factory-verified internal

  used until the stock ran out, before the new 2009 exhaust with a swirl device (GM misspells swirl)

  ⛭ GM factory document — 2009 gmc sierra 2wd rpo code list, p.1.

This page aggregates every documented appearance of 2K3 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.