2004 Pontiac Bonneville Service and Repair Manual

This factory service and repair manual for the 2004 Pontiac Bonneville spans two quite different gasoline engines in one four-door sedan. A 3.8-liter overhead-valve V6 sits alongside a 4.6-liter V8 with double overhead camshafts, neither using forced induction, and the lineup runs to three trims: GXP, SE and SLE. Procedures, specifications, torque values, wiring diagrams and diagnostics are given for the engine, cooling and fuel systems, transmission, brakes, steering, suspension and electrical system.

Engines covered

• 3.8L V6 (231 cu in) — OHV, naturally aspirated, gasoline
• 4.6L V8 (281 cu in) — DOHC, naturally aspirated, gasoline

Body styles covered

• 4-door sedan

Trims covered

• GXP
• SE
• SLE

Known issues on the 2004 Bonneville. Owners lodged 28 complaints with NHTSA about this model year. The electrical system drew the most, 11, with steering next at 8, followed by the power train at 3 and air bags and engine and engine cooling at 2 apiece. Among them, 2 complaints reported an injury and 1 reported a fire. Electrical faults and steering concerns are where this sedan's owners most often start, and the wiring diagrams, steering specifications and diagnostic procedures in this manual are the natural reference for tracing them.