🏷️ Basic Information

Make:

GMC

Model:

Envoy

Year:

2006

Generation Designation:

Second Generation (GMT360)

Platform Code:

GMT360

👋 Introduction

Positioning:

Positioned as a comprehensive, licensed digital service and repair manual for DIY enthusiasts and professional mechanics seeking factory-level information for the 2006 GMC Envoy.

Comparison To Print:

Offers superior convenience, cost-effectiveness, and up-to-date information compared to older printed manuals. Enables faster access to specific procedures and diagnostic information.

Licensing:

Officially licensed and derived from OE (Original Equipment) materials, ensuring accuracy and completeness.

Interface:

User-friendly interface with push-button access to information, facilitating quick lookups for repairs and maintenance.

Accessibility:

Accessible on any internet-enabled device with a web browser, offering flexibility for users in various locations.

📋 Manual Details

Primary Coverage Areas:

Engine, Drivetrain, Brakes, Suspension, Steering, Electrical System, HVAC, Body, Chassis, Diagnostics, Maintenance

Estimated Page Count:

Extensive (typically over 1500 pages for full factory equivalent)

Type:

Service and Repair Manual Software

Language:

English

Format:

Online/Digital Software (Web-based Access)

📖 Manual Coverage

Powertrain:

Engine mechanical, fuel system, ignition system, emissions control, cooling system, lubrication system, exhaust system, transmission (automatic), transfer case (4WD models), drive axles, differentials

Chassis:

Suspension (front and rear), steering system, brake system (hydraulic, ABS, electronic brake control), wheels and tires

Body And Electrical:

Body panels, interior trim, doors, windows, locks, safety systems (airbags, seat belts), lighting, instrumentation, climate control (HVAC), infotainment system, wiring diagrams, fuses, relays, body control module (BCM), power distribution

Maintenance:

Scheduled maintenance intervals, fluid checks and changes, filter replacements, tire rotation, lubrication

Troubleshooting:

Diagnostic procedures, fault code interpretation, symptom-based troubleshooting guides

Repair And Rebuild:

Component removal and installation, disassembly and reassembly, torque specifications, alignment procedures, electrical component testing and repair

Technical Data:

Specifications for all systems, fluid capacities, viscosity grades, electrical schematics, diagnostic connector pinouts, component identification

Depth:

Comprehensive; covers basic maintenance to advanced diagnostics and component-level repairs, including detailed electrical schematics and procedures for specialized tools.

📊 Manual Specifications

Digital Format Details:

Web-based access, compatible with most modern web browsers on PC, laptop, smartphone, and tablet. Requires internet connection.

Print Quality Note:

N/A (Digital format, not a physical print)

Binding Type:

N/A (Digital format, not a physical print)

Paper Type:

N/A (Digital format, not a physical print)

Access Period:

1 Year of access included, with discounts for extended subscriptions.

⚙️ Engine Specifications

Engine Type:

Inline 6-Cylinder (I6)

Engine Code Common:

LL8 (4.2L Vortec 4200)

Displacement:

4.2 Liters (256 cubic inches)

Bore X Stroke:

3.70 in x 3.54 in (94.0 mm x 90.0 mm)

Compression Ratio:

10.1:1

Horsepower Peak:

275 hp @ 6000 rpm (approx.)

Torque Peak:

275 lb-ft @ 4000 rpm (approx.)

Engine Block Material:

Aluminum Alloy

Cylinder Head Material:

Aluminum Alloy

Fuel Delivery:

Sequential Multi-Port Fuel Injection (MPI)

Fuel Type:

Unleaded Regular Octane (87 Minimum)

Fuel Pump Pressure:

60-66 psi

ECM Model:

Delphi DRD (or similar)

Ignition System:

Distributorless Ignition System (DIS) with coil-on-plug

Coolant Capacity:

16.0 Quarts (15.1 Liters)

Oil Capacity With Filter:

7.0 Quarts (6.6 Liters)

Recommended Oil Viscosity:

SAE 5W-30

Oil Filter Part Number Example:

ACDelco PF1215 or equivalent

🔧 Transmission

Type:

4-Speed Automatic

Model Example:

4L60-E / 4L65-E

Fluid Type:

Dexron-III / Dexron-VI (as specified by GM)

Fluid Capacity:

Approx. 5.7 Quarts (5.4 Liters) for refill

Type:

N/A for 2006 Envoy (all models were automatic)

Drivetrain Options:

RWD (Rear-Wheel Drive), AWD (All-Wheel Drive)

📐 Dimensions

Wheelbase:

113.0 inches (2870 mm)

Length:

192.4 inches (4887 mm)

Width:

75.0 inches (1905 mm)

Height:

73.1 inches (1857 mm)

Ground Clearance:

8.0 inches (203 mm) (approx.)

Cargo Volume Behind 3Rd Row:

N/A (Envoy was typically 2-row or optional 3-row without a dedicated rear cargo area behind the third row in the same way as larger SUVs)

Cargo Volume Behind 2Nd Row:

67.3 cu ft (1906 L) (approx.)

Cargo Volume Max:

109.1 cu ft (3089 L) (approx.)

Curb Weight Rwd:

4,684 lbs (2,125 kg) (approx.)

Curb Weight AWD:

4,862 lbs (2,205 kg) (approx.)

Max Payload Capacity:

Approx. 1,400-1,500 lbs (635-680 kg)

Towing Capacity Max:

6,900 lbs (3,130 kg) (with proper trailering package)

Standard Wheel Size:

17-inch

Optional Wheel Size:

18-inch

Wheel Bolt Pattern:

6 x 139.7 mm (6 x 5.5 inches)

Standard Tire Size:

P245/65R17

🛡️ Safety Features

NHTSA Frontal Driver:

5 Stars (2006 Model Year)

NHTSA Frontal Passenger:

5 Stars (2006 Model Year)

NHTSA Side Driver:

5 Stars (2006 Model Year)

NHTSA Side Rear Passenger:

5 Stars (2006 Model Year)

IIHS Frontal Offset:

Good (2006 Model Year)

ABS:

Standard (Anti-lock Braking System)

Traction Control:

Standard (often referred to as StabiliTrak or similar)

Electronic Stability Control:

Standard (StabiliTrak)

Airbags Front:

Standard dual-stage frontal airbags

Airbags Side:

Optional front-seat side-impact airbags, optional third-row side curtain airbags (on models with 3rd row)

Seatbelts:

All seating positions equipped with three-point safety belts

💡 Technology Features

Audio System:

Standard AM/FM stereo with CD player. Optional Bose premium audio system, in-dash CD changer, rear seat entertainment system.

Navigation:

Optional factory-installed GPS navigation system.

Rear Parking Assist:

Optional ultrasonic rear parking assist system.

Onstar:

Available OnStar system with safety and security services.

Climate Control:

Manual or optional dual-zone automatic climate control with rear-seat climate controls.

🔧 Maintenance

Oil Change Interval:

Every 3,000-5,000 miles or as indicated by the Oil Life Monitoring System. Consult manual for specific conditions.

Engine Air Filter:

Inspect every 15,000 miles, replace as needed (typically every 30,000-45,000 miles).

Cabin Air Filter:

Replace every 15,000-30,000 miles or as needed for air quality.

Spark Plugs:

Replace every 100,000 miles (uses iridium-tipped plugs).

Transmission Fluid Change:

Check fluid level regularly. Change fluid and filter every 30,000-60,000 miles, depending on driving conditions and service history.

Coolant Change:

Initial change at 100,000 miles, then every 50,000 miles thereafter (using Dex-Cool compatible coolant).

Engine Oil:

SAE 5W-30, API Certified

Transmission Fluid:

Dexron-III H / Dexron-VI Automatic Transmission Fluid

Coolant:

GM P/N 12346290 (Orange, Extended Life) or equivalent silicate-free, long-life coolant

Brake Fluid:

DOT 3

Power Steering Fluid:

GM P/N 1050017 or equivalent Dexron-III

Common Issues Engine:

Intake manifold gaskets, oil pressure sensor leaks, crankshaft position sensor failures, timing chain tensioner wear (less common on I6 than early V8s).

Common Issues Transmission:

Torque converter shudder, transmission fluid leaks, solenoid failures (especially in older units).

Common Issues Suspension Steering:

Ball joint wear, tie rod end wear, rear axle seal leaks, CV joint wear (on AWD models).

Common Issues Electrical:

HVAC blower motor resistor failure, power window motor failures, instrument cluster issues (dimming or pixel loss), rear liftgate latch actuator failure.

Common Issues Body:

Rust issues, particularly on rocker panels and wheel wells. Rear hatch struts and seal degradation.

📚 Vehicle History

Gmc History:

General Motors Company (GMC) has a long history, originating from the Grabowsky Brothers truck company in 1902, focusing on trucks and commercial vehicles before expanding into SUVs and other passenger vehicles.

Envoy Lineage:

The Envoy nameplate was first used for a luxury trim level of the GMC Safari van. The GMC Envoy SUV was introduced in 1998 as a rebadged Chevrolet TrailBlazer for the 1998 model year, based on the GMT360 platform.

Second Generation Features:

The second generation (GMT360) was launched for the 2002 model year. It offered a more refined interior, improved handling, and expanded powertrain options, including the powerful Vortec 4200 I6 and optional V8 engines (though the V8 was not available in the standard Envoy for 2006, it was in the Envoy XL and Denali trims).

Production Years:

1998-2009

Manufacturing Locations:

Moraine, Ohio, USA; Oklahoma City, Oklahoma, USA

🏆 Awards & Recognition

Jd Power Initial Quality:

The GMT360 platform, on which the 2006 Envoy is based, received mixed reviews in initial quality studies during its production run, with some areas performing well and others needing improvement.

Motor Trend SUV Of The Year:

While not a winner, the platform was part of a segment that often competed for such accolades. The Envoy was recognized for its strong powertrain and comfortable ride.