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.
External Pages
/MT1), but are still accessible from a link in your vehicle's manual. Be very cautious using repair info from here because these pages may not apply to your vehicle. Different variant/trim Section 1 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) Section 2 (Engine Mechanical - 4.3L) Section 3 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Introduction (1 Of 2)) Section 4 (Engine Control System & Fuel System - 4.3L - Introduction (2 Of 2)) Section 5 (Engine Control System & Fuel System - 6.6L (LMM) - Introduction (2 Of 2)) Section 6 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Introduction (2 Of 2)) Section 7 (Engine Control System & Fuel System - 4.3L - Troubleshooting & Diagnosis) Section 8 (Engine Control System & Fuel System - 6.6L (LMM) - Troubleshooting & Diagnosis) Section 9 (Engine Control System & Fuel System - 4.3L - DTC P0016 To DTC P0336) Section 10 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P0016 To DTC P0299) Section 11 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P2770) Section 12 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P0300 To DTC P0699) Section 13 (Engine Control System & Fuel System - 4.3L - DTC P0340 To DTC P2138) Section 14 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P0700 To DTC P2463) Section 15 (Engine Control System & Fuel System - 6.6L (LMM) - DTC P2510 To DTC P2693) Section 16 (Engine Mechanical - 6.6L - 1 Of 5) Section 17 (Transfer Case - BW 4473-NP3) Section 18 (Engine Mechanical - 6.6L - 2 Of 5) Section 19 (Engine Control System & Fuel System - 4.3L - Introduction (1 Of 2)) Section 20 (Engine Mechanical - 6.6L - 4 Of 5) Section 21 (Engine Mechanical - 6.6L - 3 Of 5) Section 22 (Engine Mechanical - 6.6L - 5 Of 5) Section 23 (EGR Function Testing - Diesel General Motors) Different car Section 1 (Floor Coverings & Headliners) Section 2 (Seat Hardware, Seat Trim, And Upholstery) Section 3 (Instrument Panel Trim And Console Trim) Section 4 (Seat Belt System) Section 5 (Interior Trim And Paneling) Section 6 (Supplemental Inflatable Restraint System) Section 7 (Sunroof System) Section 8 (Cellular System, Entertainment System, And Navigation System) Section 9 (Lighting Systems) Section 10 (Exterior Trim) Section 11 (Warnings And Cautions) Section 12 (Wiper System & Washer System) Section 13 (Bolted Exterior Body Panels And Closures) Section 14 (Bumper System & Fascia) Section 15 (General Information) Section 16 (Frame And Underbody) Section 17 (Object Detection System) Section 18 (Parking Brake System) Section 19 (Heating, Ventilation, And Air Conditioning) Section 20 (Instrument Panel System Displays And Gauges) Section 21 (HVAC System - Manual) Section 22 (Steering Wheel & Steering Column) Section 23 (Fixed & MOVEABLE Window Systems) Section 24 (Door Lock Systems & Door Handles) Section 25 (Engine Cooling System) Section 26 (Wiring Systems And Power Management - Introduction) Section 27 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Introduction (2 Of 2)) Section 28 (Battery, Charging System And Starting System) Section 29 (Mirror System) Section 30 (Front Drive Axle) Section 31 (Tires And Wheels) Section 32 (Programming And Setup - All Systems) Section 33 (Adjustable Pedal System) Section 34 (Vehicle Diagnostic Information) Section 35 (Wiring Systems And Power Management - Troubleshooting & Diagnosis) Section 36 (Component Locations & Power, Ground And Splice Pack Connector End Views) Section 37 (Data Communication System) Section 38 (Horn System) Section 39 (Keyless Entry System And Remote Functions) Section 40 (Seat Heating System & Seat Cooling System) Section 41 (Maintenance And Lubrication) Section 42 (Antilock Brake System, Traction Control System & Stability Control System) Section 43 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Introduction (1 Of 2)) Section 44 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - Diagnosis & Troubleshooting) Section 45 (Hydraulic Brake System) Section 46 (Tire Pressure Monitoring System) Section 47 (Disc Brake System) Section 48 (Rear Drive Axle) Section 49 (Front Suspension System) Section 50 (Suspension General Diagnosis) Section 51 (Power Steering System) Section 52 (Wheel Drive Shafts) Section 53 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (2 Of 5)) Section 54 (HVAC System - Automatic) Section 55 (Suspension Control System - Suspension Damping) Section 56 (Power Seat System) Section 57 (Theft Deterrent System) Section 58 (Transfer Case - NVG 246-NP8) Section 59 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Introduction (2 Of 2)) Section 60 (Automatic Transmission - 4L80-E/4L85-E - Introduction (2 Of 2)) Section 61 (Automatic Transmission - 6L50/6L80/6L90 - Introduction (2 Of 2)) Section 62 (Immobilizer System) Section 63 (Wiring Systems And Power Management - DTC B1370 To DTC B1475) Section 64 (Cruise Control System) Section 65 (Shift Interlock System) Section 66 (Secondary And Configurable Customer Controls) Section 67 (Suspension Control System - Suspension Leveling) Section 68 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0010 To DTC P0333) Section 69 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0218 To DTC P0961) Section 70 (Automatic Transmission - 4L80-E/4L85-E - DTC P0218 To DTC P0976) Section 71 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0218 To DTC P0977) Section 72 (Engine Control System & Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0335 To DTC P3449) Section 73 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - DTC P0973 To DTC P2771) Section 74 (Automatic Transmission - 4L80-E/4L85-E - DTC P0977 To DTC P2764) Section 75 (Automatic Transmission - 6L50/6L80/6L90 - DTC P0989 To DTC P2764) Section 76 (Vibration Symptoms Diagnosis And Correction) Section 77 (Propeller Shaft And Universal Joints) Section 78 (Engine Exhaust System) Section 79 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (1 Of 5)) Section 80 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Service, Diagnosis & Troubleshooting) Section 81 (Automatic Transmission - 4L80-E/4L85-E - Service, Diagnosis & Troubleshooting) Section 82 (Automatic Transmission - 6L50/6L80/6L90 - Service, Diagnosis & Troubleshooting) Section 83 (Transfer Case - BW 4485-Nr3 AWD) Section 84 (Steering Linkage) Section 85 (Rear Suspension System) Section 86 (Wiring Systems And Power Management - Diagnostic Starting Point And In-Line Harness Connector End Views) Section 87 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (3 Of 5)) Section 88 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (4 Of 5)) Section 89 (Engine Mechanical - 4.8L, 5.3L, 6.0L And 6.2L (5 Of 5)) Section 90 (Accessory Power Socket) Section 91 (Wheel Alignment System) Section 92 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Introduction (1 Of 2)) Section 93 (Automatic Transmission - 4L80-E/4L85-E - Introduction (1 Of 2)) Section 94 (Automatic Transmission - 6L50/6L80/6L90 - Introduction (1 Of 2)) Section 95 (Exterior Trim) Section 96 (Fixed & MOVEABLE Window Systems) Section 97 (Warnings And Cautions) Section 98 (Frame And Underbody) Section 99 (Bumper System & Fascia) Section 100 (General Information) Section 101 (Lighting Systems) Section 102 (Floor Coverings And HEADLININGS) Section 103 (Seat Hardware, Seat Trim And Upholstery) Section 104 (Automatic Transaxle - 4T45-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) Section 105 (Interior Trim And Paneling) Section 106 (Supplemental Inf
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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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