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.
2001 GMC C3500 HD 6.5 F, AutomaticFACTORY OEM SERVICE PROCEDURE
GM SPO Group Numbers
GM SPO Group Numbers
| Parts Name | Group |
|---|---|
| Air Cleaner Assembly | 3.402 |
| Air Cleaner Filter | 3.410 |
| C/Case Depression Regulator Valve | 1.745 |
| C/Case Depression Regulator Valve Hose | 1.762 |
| Engine Control Module | 3.670 |
| Engine Coolant Temperature Sensor | 3.682 |
| Fuel Filter | 3.890 |
| Fuel Tank | 3.001 |
| Glow Plug | 2.270 |
| Glow Plug Relay | 2.510 |
Factory Service Tools
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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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