2004 GMC Envoy Service and Repair Manual

This factory service and repair manual for the 2004 GMC Envoy is written around a four-door sport utility with one engine and two trims: the naturally aspirated 4.2L DOHC inline-six, in SLE or SLT form. What separates those trims is equipment rather than mechanicals, so the book reads as one continuous set of procedures, running through engine and cooling, fuel and emissions, transmission and transfer case, steering, suspension, brakes and body circuits, each with its specifications, torque values, wiring diagrams and diagnostic charts.

Engines covered

• 4.2L inline-six (256 cu in) — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sport utility

Trims covered

• SLE
• SLT

Known issues on the 2004 Envoy. Two recalls appear on the federal record. One involves aftermarket headlamp assemblies whose housings deformed in production, twisting the reflector out of position so the beam pointed away from where it should. The other covers a turn signal that could flash every lamp at once, like a hazard warning, instead of indicating the side the driver intended. Owners have logged 374 complaints, with the electrical system accounting for 145 of them and fuel-related reports next. Lighting circuits, fuel delivery and body circuit diagnostics are all documented here with wiring diagrams.