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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
BRAKE SERVICE PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Drum Brakes -> Adjustments -> Automatic Apply Parking Brakes -> Canyon & Colorado -> Control Rod -> HHR -> Manual Parking Brake -> Service Brake -> Sierra & Silverado -> Vue
Vehicle: 2008 GMC Sierra 2500 HD SLT 6.6 V8 DIESEL
Service Brake
The following procedure has been revised by a technical service bulletin.
These brakes have self-adjusting shoe mechanisms that ensure correct lining-to-drum clearances at all times. The automatic adjusters operate only when the brakes are applied as the vehicle is moving rearward or when the vehicle comes to an uphill stop.
Although the brakes are self-adjusting, an initial adjustment is required after the brake shoes have been relined or replaced, or when the length of the adjusting screw has been changed during some other service operation.
Frequent usage of an automati...
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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 SLE 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
Component Locations
Vehicle: 2008 GMC Sierra 2500 HD SLT 6.6 V8 DIESEL
Refer to ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Starter, Replace
Vehicle: 2008 GMC Sierra 2500 HD SLE 6.0 V8 GAS
- Disconnect battery ground cable.
- Raise and support vehicle.
- On models equipped with skid plate, remove skid plate mounting bolts and skid plate.
- On all models, remove front transmission cover bolt.
- Remove starter motor mounting bolts.
- Disconnect engine wiring harness electrical connector from oil level sensor.
- Slide starter forward until it clears transmission, then properly support starter. Avoid cable and wiring damage. DO NOT suspend starter by cables or wires attached to solenoid terminals. Use a rope or mechanics wire to suspend starter.
- Lower vehicle half way.
- Remove right front ...
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MAINTENANCE LAMP RESET PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
General Motors Corp./Saturn Trucks -> All Wheel Drive (AWD) System Warning Lamp ->
Vehicle: 2008 GMC Sierra 2500 HD SLE 6.0 V8 GAS
This lamp should light for a approximately 6-8 seconds when the ignition is turned On as a bulb check. If the war...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 2008 GMC Sierra 2500 HD AUTOMOBILES
Radiator, Replace
Vehicle: 2008 GMC Sierra 2500 HD WT 6.0 V8 GAS
- Drain radiator coolant into suitable container.
- Remove upper and lower radiator hoses.
- Remove mounting bolts and lower fan shroud.
- Remove engine vent hose and surge take hose.
- Disconnect engine o...
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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 SLE 6.6 V8 DIESEL
- Rotate tensioner to release belt tension using a 1/2 inch breaker bar with a 5/8 inch socket placed on tensioner pulley, then remove belt.
- Route be...
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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+.
Front End Components Diagram for 2008 GMC Sierra 2500 HD SLT 6.0 V8 GAS Components on diagram: |
Overhead Console Diagram for 2008 GMC Sierra 2500 HD WT 6.6 V8 DIESEL Components 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 SLE 6.6 V8 DIESEL Wiring Diagram Components on diagram: |
2008 GMC Sierra 2500 HD WT 6.0 V8 GAS Wiring Diagram Components 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+.
Document: Second Order Prop Shaft Vibration Or Launch Shudder Vehicle: 2008 GMC Sierra 2500 HD WT 6.0 V8 GAS Symptoms: |
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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