8U4 ✓ Factory-verified

GMC · Regular Production Option

Heater, engine block (SEO)

Years 2001–02 Models 2 Factory citations 3

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Also documented for ChevroletOldsmobile

Documented applications

Jimmy — second generation (1995–2001) →

• 2001 ✓ Factory-verified
  ⛭ GM factory document — 2001 gmc jimmy 4wd rpo code list, p.1.

Sonoma — second generation (1994–2004) →

• 2001–2002 ✓ Factory-verified
  ⛭ GM factory document — 2001 gmc sonoma pickup 4wd rpo code list, p.1.

  ⛭ GM factory document — 2002 gmc sonoma pickup 4wd rpo code list, p.1.

This page aggregates every documented appearance of 8U4 in the GMC reference. Confidence and citations are shown per application — the same code can be better documented in one year than another.