2003 Chevrolet Avalanche 2500 Service and Repair Manual

This factory service and repair manual for the 2003 Chevrolet Avalanche 2500 concerns one configuration and describes it completely: a four-door crew cab pickup, Base trim, carrying the naturally aspirated 8.1-liter overhead-valve V8 of 496 cubic inches on gasoline. Every torque value, clearance, capacity and wiring diagram in the book belongs to that truck, which removes the usual work of deciding whether a given specification applies to the vehicle standing on the lift.

Engines covered

• 8.1L V8 (496 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door crew cab pickup

Trims covered

• Base

Known issues on the 2003 Avalanche 2500. Six recalls are recorded for this year. A left-angle frontal impact of enough severity can tear the mid-frame cross member where it meets the left frame rail, and the torn edge can cut into the fuel tank. A brake hydro-boost housing machined outside specification can fracture the valve's O-ring seal, with steering effort rising while the driver is braking. Tailgate support cables can corrode until they snap. The rest cover second-row belt routing, a leaking replacement fuel filter and nonconforming lamps. Owners filed 422 complaints, 133 of them on the service brakes and 125 on the electrical system.