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2008 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
- Brake Service
- Driveline, U-Joint & CV Axles Replacement
- Tire Pressure Monitoring System
- Starter & Alternator Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 2008 GMC Sierra 2500 HD car and truck
repair procedures including GMC engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your GMC Sierra 2500 HD automobile. Try the Automotix DIY solution today!
BRAKE SERVICE PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Power Brake Units -> Delco Brake Booster -> Precautions -> Connect -> Disconnect -> Hybrid Battery Service
Vehicle: 2008 GMC Sierra 2500 HD WT 6.6 V8 DIESEL
Hybrid Battery Service
Disconnect
Before working on any high voltage system, be sure to wear the following Personal Protection Equipment: Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors. Certified and up-to-date Class "0" Insulation gloves rated at 1000 volts with leather protectors. Visually and functionally inspect the gloves before use. Wear the Insulation gloves at all times when working with the high voltage battery assembly, whether the system is energized or not. Failure to follow the procedure exactly as written may res...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
DRIVESHAFT, Replace -> Front -> One-Piece Driveshaft -> Rear -> Two-Piece Driveshaft
Vehicle: 2008 GMC Sierra 2500 HD WT 6.6 V8 DIESEL
Front
Before disassembly, observe and accurately reference mark all driveline components relative to the propeller shaft and axles. These items include 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 expos...
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TIRE PRESSURE MONITORING SYSTEM PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Relearn Procedures -> Keyless Entry Transmitter Or DIC Method -> Scan Tool Method
Vehicle: 2008 GMC Sierra 2500 HD WT 6.6 V8 DIESEL
Keyless Entry Transmitter Or DIC Method
- On models with standard ignition switch, place the ignition switch in the On position.
- On models with keyless ignition switch, place the ignition switch in the Accy position.
- On all models, using the keyless entry transmitters press the lock and unlock buttons at the same time until a horn chirp sounds indicating the learn mode has been actuated. The left front turn signal will also be illuminated.
- Using the DIC (Driver Information Center) press and release the Info button until the Tire Learn message is indicated on the DIC display. Depres...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Alternator, Replace
Vehicle: 2008 GMC Sierra 2500 HD SLT 6.6 V8 DIESEL
- Disconnect battery ground cable.
- Disconnect positive crankcase ventilation hose from air cleaner outlet resonator.
- Loosen air cleaner outlet resonator clamps at mass air flow intake air temperature sensor and at throttle body.
- Remove air cleaner outlet resonator.
- Remove drive belt using suitable tools.
- Remove engine wiring harness clip from air conditioning compressor and condenser hose bracket.
- Remove air conditioning compressor and condenser hose bracket bolt.
- Remove heate...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
General Motors Corp./Saturn Trucks -> Check Engine Oil Level ->
Vehicle: 2008 GMC Sierra 2500 HD WT 6.6 V8 DIESEL
This system is used to indicate a low engine oil level condition. The lamp should light during engine starting. If oil level is sufficient, the lamp should go off when engine is operating. If oil level is low the...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Coolant Hose, Replace -> Lower -> Upper
Vehicle: 2008 GMC Sierra 2500 HD SLE 6.0 V8 GAS
Lower
- Drain cooling system into a suitable container.
- Remove air cleaner outlet duct.
- Remove air cleaner housing.
- Reposition hose clamp from engine.
- Remove radiator outlet hose from engine.
- Reposition hose clamp from radiator.
- Remove radiator outlet hose from radiator and from vehicle.
- Reverse procedure to inst...
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SERPENTINE BELT SERVICE PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 2008 GMC Sierra 2500 HD WT 6.0 V8 GAS
- Rotate tensioner clockwise to release belt tension using suitable wrench, then remove belt.
- Route belt over pulleys excep...
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COMPONENT LOCATION DIAGRAMS FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Component location diagrams for most 2008 GMC Sierra 2500 HD cars and light trucks sold in the U.S. from 1990+.
 Instrument Panel Diagram for 2008 GMC Sierra 2500 HD SLE 6.6 V8 DIESELComponents on diagram: |
 Frame and Underbody Components Diagram for 2008 GMC Sierra 2500 HD SLE 6.0 V8 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
OEM drawn wiring diagrams for most 2008 GMC Sierra 2500 HD cars and light trucks sold in the U.S.
 2008 GMC Sierra 2500 HD SLT 6.0 V8 GAS Wiring DiagramComponents on diagram: |
 2008 GMC Sierra 2500 HD SLT 6.6 V8 DIESEL Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
OEM TSB listings for most 2008 GMC Sierra 2500 HD cars and light trucks sold in the U.S. from 1985+.
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Document: Second Order Prop Shaft Vibration Or Launch Shudder Vehicle: 2008 GMC Sierra 2500 HD WT 6.0 V8 GAS Symptoms: |
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Document: Revised General Motors New Vehicle Tire Warranty Program Vehicle: 2008 GMC Sierra 2500 HD WT 6.0 V8 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 2008 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 2008 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 2008 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 2008 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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