2009 GMC T8500 Service and Repair Manual
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2009 GMC T8500 Service and Repair Manual
The 2009 model year was the last for the GMC T8500, as GM wound down its medium-duty trucks, and it arrives in one chassis configuration, T8F042, a straight truck with a low tilt cab. Its turbocharged 7.8L diesel inline-six of 475 cubic inches is the same engine as the Chevrolet T8500, its twin. This service and repair manual documents that final-year build, with procedures, specifications, torque values, wiring diagrams, diagnostics and maintenance schedules covering the engine, air brakes, driveline, frame and electrical system, making it the reference for keeping a truck that GM no longer supports on the road.
Engines covered
- 7.8L inline-six (475 cu in) — turbocharged, diesel
Body styles covered
- straight truck, low tilt
Trims covered
- T8F042
Known issues on the 2009 T8500. No recalls are on federal record for this year. NHTSA does record two owner complaints, touching the air bags, equipment and the electrical system. The electrical diagnostics and wiring diagrams in this manual support tracing faults in those circuits, alongside the full engine, brake and chassis procedures.