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.
2021 GMC Yukon AT4FACTORY OEM SERVICE PROCEDURE
Grind Complete
WARNING: This page is about the Yukon Denali, 3.0L Eng VIN T, 4WD, which is a different variant/trim than selected.
Includes: Remove carbon, check surfaces for warpage, reface or replace Valves, resurface Valve Seats and clean Valve Guides. Adjust Valves (where applicable).| Applies To | Note | Standard Hours | Warranty Hours | Skill Level |
|---|---|---|---|---|
| 3.0L Eng,4WD, w/Air Suspension | Includes: R&I Wiper Link Assembly & Cowl Top Panel. Includes: R&I Front Bumper Cover and Headlamp Assemblies. DOES NOT include Headlamp adjustment. Includes: R&I Cooling Module. Includes: R&I Engine Assembly. Includes: R&I Charge Air Cooler. Includes: R&I Fuel Injectors. Includes: R&I Turbocharger. Includes: Drain and refill Cooling System. Includes: Drain and refill Engine Oil. Includes: Perform Filter Life Monitor Reset procedure. Includes: Check and adjust Transmission Fluid level with fluid temperature within parameters. Includes: Programming. DOES NOT include Air Conditioning System recover, evacuate and recharge. | 42.4 | A | |
| 3.0L Eng,4WD, w/o Air Suspension | Includes: R&I Wiper Link Assembly & Cowl Top Panel. Includes: R&I Front Bumper Cover and Headlamp Assemblies. DOES NOT include Headlamp adjustment. Includes: R&I Cooling Module. Includes: R&I Engine Assembly. Includes: R&I Charge Air Cooler. Includes: R&I Fuel Injectors. Includes: R&I Turbocharger. Includes: Drain and refill Cooling System. Includes: Drain and refill Engine Oil. Includes: Perform Filter Life Monitor Reset procedure. Includes: Check and adjust Transmission Fluid level with fluid temperature within parameters. Includes: Programming. DOES NOT include Air Conditioning System recover, evacuate and recharge. | 42.2 | A | |
| Additional Procedure: VALVE: Grind Complete: | ||||
| 3.0L Eng, Where Skid Plate interferes add | 0.2 | A | ||
| Combination Procedure: FUEL INJECTION SYSTEM: Reset: | ||||
| 3.0L Eng, Fuel System Reset Procedure | Includes: Additional time for use of scan tool to perform this procedure. | 0.2 | B | |
| Combination Procedure: TURBOCHARGER BOOST PRESSURE: Reset: | ||||
| 3.0L Eng, Turbocharger Boost Control Initial Position Learn | Includes: Additional time for use of scan tool to perform this procedure. | 0.2 | B | |
| Combination Procedure: VALVE LIFTERS (REMOVED): Clean: | ||||
| Each Additional | 0.1 | B | ||
| One | 0.2 | B | ||
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.