This factory service and repair manual for the 1992 GMC P6500 lists one trim, the P6S042, and three engines behind it. Two are gasoline overhead-valve V8s, at 6.0 liters and 366 cubic inches and at 7.0 liters and 427 cubic inches; the third is a turbocharged overhead-valve inline-six diesel of 6.6 liters and 403 cubic inches. Each engine is documented separately, and the chassis systems around them get the same treatment, with procedures, specifications, torque values, wiring diagrams and diagnostics organized so the right figures are quick to find.
Engines covered
- 6.0L V8 (366 cu in) — OHV, naturally aspirated, gasoline
- 7.0L V8 (427 cu in) — OHV, naturally aspirated, gasoline
- 6.6L inline-six (403 cu in) — OHV, turbocharged, diesel
Trims covered
- P6S042
Known issues on the 1992 P6500. The federal record for this chassis is clean — no recalls have been issued and no owner complaints are logged with NHTSA. Diagnosis on a truck like this usually starts with the fuel and charging systems, and the manual gives those the same treatment as everything else: test sequences, specifications and wiring diagrams for the gasoline V8s' ignition and fuel delivery, injection and turbocharger procedures for the 6.6L diesel, and torque values throughout the chassis and driveline.
