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.
Model Identification
To identify the proper procedures for the vehicle, identify the vehicle body. See BODY IDENTIFICATION table.
| Style | Model |
|---|---|
| Pickup | Sierra & Silverado, 3500 HAD |
| Utility | Avalanche, Escalade, Escalade ASV, Escalade EX, Suburban, Tahoe, Yukon, & Yukon XL |
Vehicle drivetrain can be identified by 5th character of Vehicle Identification Number (VIN), stamped on metal pad on top of left end of instrument panel, near windshield. See DRIVETRAIN IDENTIFICATION table.
| Series (1) | Model | ||
|---|---|---|---|
| "C" | Avalanche, Escalade, Sierra, Silverado, 3500 HAD, Suburban, Tahoe, Yukon, & Yukon XL | ||
| "K" | Avalanche, Escalade, Escalade ASV, Escalade EX, Sierra, Silverado, 3500 HAD, Suburban, Tahoe, Yukon, & Yukon XL | ||
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Some procedures vary, depending on Gross Vehicle Weight Rating (GVWR) and options. For GVWR identification, check driver door jamb sticker. For Regular Production Option (RPO) Code identification, see RPO CODE IDENTIFICATION table. The RPO codes are on a label, normally located in glove box.
| RPO Code | Option |
|---|---|
| JC3 | Vacuum Boost 6400 GVWR |
| JC4 | Vacuum Boost 7200 GVWR |
| JH1 | Hydraulic Boost 6400 GVWR |
| JH2 | Hydraulic Boost 7200 GVWR |
| JH6 | Hydraulic Boost 9900 GVWR |
| JH7 | Hydraulic Boost 12,300 GVWR |
| JL4 | Active Brakes |
| NYS | 4-Wheel Steering |
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.