Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC2003SIERRA 2500 HD, 2D PICKUP, 6.6 1, RWD, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM & COMPONENT TESTING - 6.6LCOMPONENT LOCATIONS
2003 GMC Sierra 2500 HD, 2D Pickup, 6.6 1, RWD, Standard
Component Locations
2003 GMC Sierra 2500 HD, 2D Pickup, 6.6 1, RWD, StandardSECTION Component Locations
NOTE:
For component locations refer to COMPONENT LOCATIONS
table or illustrations. See Fig 1
-Fig 10
.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| Accelerator Pedal Position Sensor | Behind Accelerator Pedal |
| Barometric Pressure Sensor | Left Side Of Engine |
| Body Control Module | Left Side Of Dash |
| Boost Pressure Sensor | On Intake Manifold |
| Camshaft Position Sensor | Front Of Engine |
| Crankshaft Position Sensor | Right Side Of Harmonic Balancer |
| Data Link Connector | Under Left Side Of Dash |
| Engine Control Module | Left Front Of Engine Compartment |
| Engine Coolant Temperature Sensor | Next To Oil Filler Tube |
| Engine Oil Level Switch | Left Rear Of Oil Pan |
| Fuel Filter | On Bracket, Mounted on Valve Cover |
| Fuel Heater | Top Of Fuel Filter Element |
| Fuel Injector Control Module | Under Air Intake Duct Assembly |
| Fuel Temperature Sensor | Under Upper Intake Shield |
| Intake Air Heater | Rear Of Engine |
| Intake Air Temperature Sensor/Mass Airflow Sensor | In Air Induction Tube |
| Power Take-Off Relay | Attached To Underhood Fuse Block Bracket |
| Transmission Control Module | Left Front Of Engine Compartment |
| Water-In-Fuel Sensor | Attached To Fuel Filter |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.