2005 Chevrolet Chevrolet Silverado 2500 HD

Reliability tier: verified - see /disclosure/

Engine: 6.0L V8 Gasoline (Vortec 6000, LQ4) (GM Vortec small block, 6.0L), 2v

Vortec 6000 LQ4 (VIN U): GM Gen III LS-family small-block V8, 6.0L (364 cid), OHV 2-valve, cast-iron block / aluminum heads, 9.4:1 compression (the 10:1 LQ9 HO sibling powered the SS/Escalade/Denali lines, not these HD pickups), sequential multiport fuel injection; 300 hp / 360 lb-ft (2001-2002) rising to ~335 hp / 375 lb-ft with the mid-decade updates. 4L80E/4L85E behind it (Allison optional - context only). The standard HD gas engine.

Applicable failure modes (3)

• Exhaust manifold bolt breakage (cold-start tick)
• Hard cold start / fuel delivery wear
• Ignition service at mileage: coils, wires, plugs (misfire under load)

Applicable parts (21)

• 6.0L Vortec Spark Plug / Coil Wire (OEM)
• 6.0L Vortec EGR Valve (OEM)
• gm-hd-gas-vortec: exhaust-manifold-bolt (honest catalog gap)
• gm-hd-gas-vortec: exhaust-manifold (honest catalog gap)
• 6.0L Vortec Fan Clutch (OEM)
• 6.0L Vortec Fuel Injector (OEM)
• 6.0L Vortec HD Fuel Injector Assembly (OEM)
• 6.0L Vortec Fuel Pressure Sensor (OEM)
• GM HD In-Tank Fuel Pump Module 2004-2007 (OEM)
• 6.0L Vortec Fuel Rail, Passenger Side (OEM)
• 6.0L Vortec Fuel Rail Assembly 2004-2007 (OEM)
• 6.0L Vortec HD Fuel Rail 2002-2006 (OEM)
• 6.0L Vortec Fuel Rail 2004-2006 (OEM)
• 6.0L Vortec Fuel Temperature Sensor (OEM)
• 6.0L Vortec Cylinder Head Gasket Kit (OEM)
• 6.0L Vortec Ignition Coil Kit (OEM)
• GM Truck V8 Ignition Coil (shared 4.8-8.1 line) (OEM)
• 6.0L Vortec Spark Plug (OEM)
• 6.0L Vortec Spark Plug Wire Kit (OEM)
• 6.0L Vortec Thermostat (OEM)
• 6.0L Vortec Water Pump Kit (OEM)

Platform recipes (3)

• Cold-start tick on a 6.0L or 8.1L GMT800 HD gas truck: find the leaking manifold flange before blaming lifters or injectors, then extract the sheared studs and refit bolts and gaskets (mode fm-gvg-exhaust-manifold-bolts)
• Hard-cold-start path (fm-gvg-fuel-delivery-cold-start): the owner record puts most cases on tired in-tank pumps and rail pressure bleed-down, not ignition
• Ignition service path (fm-gvg-ignition-misfire): misfire under load / rough idle at mileage on the 2001-2007 HD gas engines

Recalls that include this truck (1)

• 06V-289 (August 3, 2006) - ENGINE AND ENGINE COOLING: ON CERTAIN TRUCKS EQUIPPED WITH AN 8.1L V8 (RPO L8-VIN G) ENGINE HAVE A CONDITION IN WHICH THE ENGINE FUEL RAIL PULSE DAMPER RETAINER CLIP MAY FRACTURE RESULTING IN INADEQUATE RETENTION OF THE DAMPER.

Matched by the model and model year NHTSA lists for each recall - a recall often covers only part of a year's production, so read its text for the build dates and versions it names. Whether a recall is still open on your VIN is not known here; check nhtsa.gov/recalls. All recalls, investigations and bulletins for this engine: /recalls/gm-hd-gas-vortec/

Reference for this truck