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.
2003 GMC Envoy RWDFACTORY OEM SERVICE PROCEDURE
Component Locations
NOTE:
For component locations refer to COMPONENT LOCATIONS
table or illustrations. See Fig 1
-Fig 10
.
COMPONENT LOCATIONS
| Component | Location |
|---|---|
| A/C Low Pressure Switch | Right Rear Of Engine Compartment, On Accumulator |
| A/C Refrigerant Pressure Sensor | On High Pressure Hose Connection To Compressor |
| A/C Relay | In Underhood Fuse/Relay Block |
| Accelerator Pedal Position Sensor | On Accelerator Bracket |
| Body Control Module | Attached To Rear Fuse Block, Beneath Left Rear Seat |
| Camshaft Actuator Solenoid Assembly | On Upper Right Of Engine Block |
| Camshaft Position Sensor | Upper Right Front Of Engine Block, Below Valve Cover |
| Crankshaft Position Sensor | Below Starter |
| Data Link Connector | Below Instrument Panel, Above Accelerator Pedal |
| Engine Coolant Temperature Sensor | On Left Front Of Engine Block, Near Generator |
| Engine Oil Level/Temp Sensor | Right Side Of Engine Block |
| EVAP Canister Purge Solenoid | Left Side Of Engine Block |
| EVAP Canister Vent Solenoid | Rear Of Fuel Tank |
| Fuel Pump Relay | In Underhood Fuse/Relay Block |
| Fuel Tank Pressure Sensor | Top Left Rear Of Fuel Tank |
| HO2S 1 | On Right Side Exhaust Manifold |
| HO2S 2 | In Exhaust Pipe, Near Transmission |
| Intake Air Temperature Sensor | In Air Intake Duct |
| Knock Sensor | Below Starter Motor |
| Knock Sensor, Rear | Behind A/C Compressor |
| Manifold Absolute Pressure Sensor | Top Left Of Engine |
| Powertrain Control Module | Mounted To Upper Left Of Engine |
| Throttle Actuator Control | Attached To Throttle Shaft, Part Of Throttle Body Assembly |
| Underhood Fuse/Relay Block | Above Left Front Inner Wheelwell |
| Vehicle Communication Interface Module | Under Right Rear Seat |
| Vehicle Speed Sensor | Attached To Output Shaft At Left Rear Of Transfer Case |
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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