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2004 GMC Sierra 2500 HD CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT GMC REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Cabin Air Filter Locations & Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
A/C & HEATER SERVICE PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Air Bag System Precautions -> General Motors Corp. -> Disarming -> 1990 -> 1990-93 -> 1990-95 -> 1990-97 -> 1991 -> 1991-93 -> 1991-94 -> 1991-95 -> 1992-93 -> 1992-99 -> 1993-2002 -> 1993-94 -> 1993-98 -> 1994 -> 1994-2002 -> 1994-95 -> 1994-96 -> 1994-98 -> 1995-2002 -> 1995-96 -> 1995-97 -> 1995-98 -> 1995-99 -> 1996 -> 1996-2001 -> 1996-97 -> 1997 -> 1997-2002 -> 1997-98 -> 1997-99 -> 1998-2000 -> 1998-2002 -> 1998-99 -> 1999 -> 1999-2000 -> 1999-2001 -> 1999-2002 -> 2000-02 -> 2001-02 -> 2002 -> 2003 -> 2003-04 -> 2003-04 Except Malibu Maxx -> Achieva & Skylark -> Alero -> Astro & Safari -> Aurora -> Avalanche -> Aveo -> Aztek & Rendezvous -> Beretta & Corsica -> Blazer, Jimmy, Sonoma & S-10 -> Bonneville, Eighty-Eight, LeSabre, LSS, Ninety-Eight & Regency -> Bravada, Envoy, Rainier, SSR & TrailBlazer -> C/K Series -> Camaro & Firebird -> Canyon & Colorado -> Caprice, Custom Cruiser & Roadmaster -> Catera -> Cavalier & Sunfire -> Century -> Corvette -> Coupe -> CTS -> Cutlass -> Cutlass Ciera & Cruiser -> Cutlass Supreme -> DeVille -> Eldorado -> Escalade -> Express, G Series & Savana -> Fleetwood -> Grand Am -> Grand Prix & Intrigue -> Impala -> ION -> L-Series -> Light Trucks & Vans -> Lumina -> Lumina APV, Montana, Silhouette, Trans Sport & Venture -> Malibu -> Malibu Maxx -> Metro -> Monte Carlo -> Park Avenue -> Passenger Cars -> Prizm -> Reatta, Toronado & Trofeo -> Regal -> Riviera -> S-Series -> Sedan -> Seville -> Sierra & Silverado -> SRX -> Storm -> Suburban, Tahoe, Yukon & Yukon XL -> Tracker -> Vibe -> VUE -> XLR -> Zone 1 -> Zone 10 -> Zone 12 -> Zone 2 -> Zone 3 -> Zone 4 -> Zone 5 -> Zone 6 -> Zone 7 -> Zone 8 -> Zone 9 -> Zones 1 & 7 -> Zones 2 & 6 -> Zones 5 & 9 -> Zones 7 & 9
Vehicle: 2004 GMC Sierra 2500 HD 6.6 V8 DIESEL
Passenger Cars
The Sensing and Diagnostic Module (SDM) can maintain enough voltage to cause air bag deployment for up to 10 minutes after the ignition is turned Off and the battery is disconnected. Servicing the Supplemental air bag (SIR) system during this period may result in accidental deployment and personal injury.
Achieva & Skylark
1994-96
- Ensure front wheels are in straight-ahead position.
- Turn ignition switch to LOCK position.
- Remove AIR BAG fuse from fuse block.
- On 1995 models, remove lefthand sound insulator panel to ac...
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BRAKE SERVICE PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Power Brake Units -> Delco Brake Booster -> Power Brake Unit, Replace -> Astro, Avalanche, Escalade EXT, Safari, Sierra, Silverado & SSR -> Aztek & Rendezvous -> Blazer, Bravada, Envoy, Jimmy, Rainier & Trailblazer -> Canyon, Colorado, Sonoma & S10 -> Equinox & Torrent -> Escalade, HHR, Suburban, Tahoe & Yukon -> Express & Savana -> Hummer H2 -> Hummer H3 -> Montana, Silhouette & Venture -> Relay, Terraza, SV6 & Uplander -> SRX -> Vue
Vehicle: 2004 GMC Sierra 2500 HD 6.0 V8 GAS
Aztek & Rendezvous
- Remove coolant reservoir, then relieve fuel system pressure as follows:
- Loosen fuel filler cap to discharge tank pressure.
- Connect fuel pressure gauge tool No. J-34730-1A, or equivalent, to fuel pressure connection. Wrap shop towel around connection while connecting fuel pressure gauge in order to avoid fuel spillage.
- Install bleed hose into an approved container and open valve in order to bleed fuel system pressure.
- Drain any fuel remaining in fuel pressure gauge into suitable container.
- Remove cruise control cable from module, then disconnect electrical ...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
General Motors Corp./Saturn Light Trucks, SUVs & Vans -> Fuel Filter Scheduled Maintenance -> 1988-06 C/K, G & R/V Series w/Diesel Engines -> Normal Service -> Severe Service
Vehicle: 2004 GMC Sierra 2500 HD 6.6 V8 DIESEL
Normal Service
Repl...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
DRIVESHAFT, Replace -> Front -> Rear
Vehicle: 2004 GMC Sierra 2500 HD 6.0 V8 GAS
Front
Before disassembly, observe and accurately reference mark all driveline components relative to the propeller shaft and axles. These items include the propeller shafts, wheel drive shafts, pinion flanges and output shafts
Assemble all components in the exact relationship to each other as they were prior to removal. Observe all published specifications and torque values, and any measurements obtained prior to disassembly.
- Raise and support vehicle.
- Remove transfer case shield, if equipped.
- If equipped with double clamp style boot, remove clamp at transfer case by prying up ex...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Starter, Replace
Vehicle: 2004 GMC Sierra 2500 HD 6.6 V8 DIESEL
- Disconnect battery ground cable.
- Raise and support vehicle, then remove righthand front tire and wheel assembly.
- Remove righthand front fender wheelhouse inner panel.
- Remove starter motor battery positive cable, then solenoid wires.
- Remove star...
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CABIN AIR FILTER LOCATIONS & REPLACEMENT PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Cabin Air Filter Service -> General Motors Corp./Saturn -> 1999-2007 Silverado, Sierra, 2000-07 Denali, Suburban, Tahoe, Yukon, Yukon XL, 2001-07 Escalade & 2002-07 Avalanche
Vehicle: 2004 GMC Sierra 2500 HD 8.1 V8 GAS
Under normal operating conditions the cabin air filter should be replaced every 15,000 miles. In dusty areas change the cabin air filter more often.
- Remove the righthand instrument panel hush panel.
- Remove the A/C and heater modul...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
General Motors Corp./Saturn Trucks -> Low Coolant Lamp ->
Vehicle: 2004 GMC Sierra 2500 HD 8.1 V8 GAS
This lamp should light when engine coolant level in the radiator drops below a predetermined le...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Heater Hose, Replace -> Inlet -> Outlet
Vehicle: 2004 GMC Sierra 2500 HD 8.1 V8 GAS
Inlet
- Drain cooling system into a suitable container.
- Reposition heater core inlet hose clamp at engine.
- Remove hose from engine.
- Reposition heater hose inlet clamp at heater core.
- Remove heater inlet hose from heater core.
- Remove hose from vehicle.
- Reverse procedure to in...
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SERPENTINE BELT SERVICE PROCEDURES FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 2004 GMC Sierra 2500 HD 8.1 V8 GAS
- Rotate tensioner counterclockwise, using suitab...
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COMPONENT LOCATION DIAGRAMS FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
Component location diagrams for most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S. from 1990+.
Roof Marker and Clearance Lamps Diagram for 2004 GMC Sierra 2500 HD 8.1 V8 GAS Components on diagram: |
Transfer Case Shift Control Switch Diagram for 2004 GMC Sierra 2500 HD 6.6 V8 DIESEL Components on diagram: |
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WIRING DIAGRAMS FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
OEM drawn wiring diagrams for most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S.
2004 GMC Sierra 2500 HD 6.6 V8 DIESEL Wiring Diagram Components on diagram: |
2004 GMC Sierra 2500 HD 8.1 V8 GAS Wiring Diagram Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
OEM TSB listings for most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S. from 1985+.
Document: 6.6L LB7, LLY Duramax Diesel Engine Cylinder Head Gasket Missing Thickness Grade Markings-Inspect Block for Stampings Vehicle: 2004 GMC Sierra 2500 HD 6.6 V8 DIESEL Auto Systems: |
Document: Information on 6.6L LBZ, LB7, LLY Duramax Diesel Engine Cylinder Head Gasket Design Change-New Head Gasket Part Numbers and Head Bolt Torque Specifications Vehicle: 2004 GMC Sierra 2500 HD 6.6 V8 DIESEL Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 2004 GMC Sierra 2500 HD AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 2004 GMC Sierra 2500 HD cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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