2012 Chevrolet Express 4500 Service and Repair Manual

This factory service and repair manual for the 2012 Chevrolet Express 4500 has a 6.0L V8 that may be plumbed for compressed natural gas instead of a flex-fuel blend, which puts high-pressure storage, regulation and metering hardware on a cutaway chassis that otherwise looks conventional. The alternative is the turbocharged 6.6L diesel V8 of 403 cubic inches. One body, the two-door cutaway, and one trim, Base, keep everything on the vehicle side of the equation simple.

Engines covered

• 6.6L V8 (403 cu in) — OHV, turbocharged, diesel
• 6.0L V8 (364 cu in) — OHV, naturally aspirated, CNG or flex-fuel

Body styles covered

• 2-door cutaway

Trims covered

• Base

Known issues on the 2012 Express 4500. The complaint record runs to four entries: one each against the fuel and propulsion system, the electrical system and the steering. The numbers are too small to read as a defect pattern, but each of those systems has a full section here, with fuel storage and delivery covered separately for diesel, flex-fuel and natural gas, wiring diagrams with connector and ground locations for tracing circuits through the cab, and steering gear, pump and linkage service with the alignment and torque specifications alongside.