2021 GMC Yukon Service and Repair Manual

This factory service and repair manual for the 2021 GMC Yukon covers three very different engines: a 5.3L overhead-valve gasoline V8 of 325 cubic inches, a 6.2L overhead-valve V8 of 376 listed for flex-fuel or gasoline, and a 3.0L turbocharged inline-six diesel of 183 cubic inches with double overhead camshafts. AT4, Denali, SLE and SLT trims sit on the one four-door sport utility body. The diesel brings its own fuel, air and control system procedures, and those run alongside the gasoline material rather than replacing it.

Engines covered

• 5.3L V8 (325 cu in) — OHV, naturally aspirated, gasoline
• 3.0L inline-six (183 cu in) — DOHC, turbocharged, diesel
• 6.2L V8 (376 cu in) — OHV, naturally aspirated, flex-fuel or gasoline

Body styles covered

• 4-door sport utility

Trims covered

• AT4
• Denali
• SLE
• SLT

Known issues on the 2021 Yukon. The federal record for this year holds eight recalls. One describes rear driveshaft assemblies with internal parts that were not heat treated properly, able to fail and cut drive power without warning. A second covers a fuel tank shell missing the adhesive between its two layers, which can let fuel escape. A third involves front seat attachment bolts left loose after an assembly repair, so an occupied seat can shift in a crash. Of 320 complaints, 131 name the engine and 44 the power train. Driveline, fuel storage and seat fastener torque values are all specified here.