🏷️ Basic Information

Make:

Jeep

Model:

Grand Cherokee

Generation Code:

WG

Model Year:

2004

Chassis Code:

WG

👋 Introduction

Positioning:

The Jeep Grand Cherokee WG (1999-2004) established Jeep's presence in the premium mid-size SUV segment, blending off-road capability with on-road comfort and luxury features.

Competitors:

Competed against vehicles like the Ford Explorer, Chevrolet Blazer/TrailBlazer, Toyota 4Runner, and Nissan Pathfinder.

Features:

Body-on-frame construction, available Quadra-Drive II 4WD system, luxurious interior appointments, strong towing capacity, and signature Jeep off-road prowess.

📋 Manual Details

Documentation Scope:

Comprehensive service and repair for all WG series Jeep Grand Cherokee models of the 2004 model year.

Estimated Pages:

1500+

Type:

Factory Service Manual / Repair Manual

Language:

English

Format:

Digital Download (PDF)

📖 Manual Coverage

Engine Systems:

Engine mechanical, fuel system, ignition system, cooling system, lubrication system, emission control systems, engine diagnostics, and troubleshooting.

Transmission Systems:

Automatic transmission (42RE, 45RFE, 545RFE) service, repair, diagnostics, and fluid specifications.

Drivetrain Systems:

Four-wheel drive (NV242, NV247) systems, transfer case, differentials (front and rear), driveshafts, and CV joints.

Suspension Steering:

Front and rear suspension components, steering system (power steering pump, rack and pinion), wheel alignment specifications.

Brake Systems:

Front and rear brake systems (disc brakes), ABS (Anti-lock Braking System), parking brake, hydraulic components, and brake bleeding procedures.

Electrical Electronics:

Complete electrical schematics, wiring diagrams, lighting, instrumentation, power accessories, body control module (BCM), engine control module (ECM), fuse and relay locations, starting and charging systems.

Body Chassis:

Body panels, doors, windows, interior trim, body sealant and vibration damping, chassis lubrication, exhaust system.

HVAC Systems:

Heating, Ventilation, and Air Conditioning (HVAC) system diagnosis and repair, refrigerant handling.

Safety Restraints:

Airbag system operation and diagnostic codes, seat belts.

Maintenance Procedures:

Scheduled maintenance, oil changes, filter replacements, fluid checks and top-offs, tire rotation, brake inspection.

Repair Procedures:

Step-by-step repair instructions for all major mechanical and electrical components, including engine rebuilds, transmission overhauls, brake caliper replacement, suspension component renewal.

Troubleshooting Diagnostics:

Detailed diagnostic procedures for common and complex problems, including symptom-based troubleshooting, diagnostic trouble codes (DTCs) and their meanings, and diagnostic flowcharts.

Diagnostic Tools:

Information on recommended diagnostic tools, scan tools, and testing equipment.

Specifications Data:

Torque specifications for all fasteners, fluid capacities, electrical specifications, alignment settings, and performance data.

Depth:

Complete engine overhaul, transmission rebuilds, complex electrical system diagnostics, body repair procedures, and detailed troubleshooting for all vehicle systems.

📊 Manual Specifications

Digital Format:

PDF

Searchability:

Searchable text for quick access to information.

Resolution:

High-resolution diagrams and illustrations for clarity.

Binding:

N/A (Digital Download)

Paper:

N/A (Digital Download)

⚙️ Engine Specifications

Engine Option 1:

4.0L (3956cc) I6 PowerTech (Engine Code: ERH)

Engine Option 2:

4.7L (4701cc) V8 Magnum (Engine Code: EVA, EVB)

Engine Option 3:

2.7L (2700cc) CRD Diesel (Engine Code: ENF - Primarily for export markets)

Horsepower:

190 hp @ 4600 rpm

Torque:

235 lb-ft @ 3200 rpm

Horsepower:

235 hp @ 4500 rpm

Torque:

300 lb-ft @ 3200 rpm

Injection Type:

Multi-point Fuel Injection (MPI)

Recommended Fuel:

Unleaded Gasoline (87 octane recommended, higher for performance models)

Catalytic Converter:

Standard on all models.

Type:

Pressurized liquid cooling system with thermostat.

Oil Capacity 4.0L:

5.0 US quarts (4.7 Liters) with filter change.

Oil Capacity 4.7L:

6.0 US quarts (5.7 Liters) with filter change.

🔧 Transmission

Transmission Type:

4-Speed Automatic (42RE for 4.0L, 45RFE/545RFE for 4.7L V8)

Transmission Type:

N/A (Only Automatic Transmissions offered for WG in 2004)

Overdrive:

All models equipped with overdrive (4th gear).

Tow Mode:

Available on some models for enhanced towing performance.

Transmission Fluid Type:

ATF+4 (Mopar)

Capacity:

9.0 US quarts (8.5 Liters)

Capacity:

10.5 US quarts (9.9 Liters)

📐 Dimensions

Length:

186.6 inches (4740 mm)

Width:

73.5 inches (1867 mm)

Height:

67.4 inches (1712 mm)

Wheelbase:

116.0 inches (2946 mm)

Passenger Volume:

approx. 105 cu ft

Cargo Volume Behind Rear Seat:

37.7 cu ft

Cargo Volume With Rear Seat Folded:

71.7 cu ft

Curb Weight 4.0L:

4,303 lbs (1952 kg)

Curb Weight 4.7L:

4,479 lbs (2032 kg)

Towing Capacity:

Up to 6,500 lbs (2948 kg) with optional towing package.

🛡️ Safety Features

NHTSA Rollover Rating:

4/5 stars (provided by manufacturer, actual ratings may vary)

ABS:

Standard 4-wheel Anti-lock Braking System (ABS).

Traction Control:

Available Traction Control (TC) on some models.

Stability Control:

Not commonly equipped on WG models; Electronic Stability Program (ESP) was introduced on subsequent generations.

Airbags:

Driver and front passenger airbags. Side curtain airbags were not standard on this generation.

Seatbelts:

Three-point seatbelts for all occupants; pretensioners for front seats.

💡 Technology Features

Audio System:

Standard AM/FM stereo with CD player. Optional premium Infinity or Boston Acoustics sound systems, available with subwoofer. Optional in-dash 6-disc CD changer.

Navigation:

Optional factory navigation system available on higher trims.

Parking Sensors:

Optional rear parking assist sensors.

Auxiliary Input:

Generally not available in the factory system; aftermarket solutions required.

Cruise Control:

Standard on most trims.

Remote Keyless Entry:

Available.

🔧 Maintenance

Oil Change Interval:

Every 5,000 - 7,500 miles (8,000 - 12,000 km) or 6 months, whichever comes first, depending on driving conditions.

Air Filter Replacement:

Every 15,000 - 30,000 miles (24,000 - 48,000 km).

Cabin Air Filter Replacement:

Every 15,000 - 30,000 miles (24,000 - 48,000 km).

Fuel Filter Replacement:

Refer to manual; generally not a scheduled replacement item unless issues arise.

Coolant Flush:

Every 30,000 miles (48,000 km) or 2 years.

Brake Fluid Flush:

Every 24,000 miles (39,000 km) or 2 years.

Transmission Fluid Service:

Every 30,000 - 60,000 miles (48,000 - 96,000 km) depending on towing/heavy use.

Engine Oil Spec:

API SP/SN/SM or ILSAC GF-6/GF-5; SAE 5W-30 recommended for most conditions. SAE 10W-30 may be used in warmer climates.

Coolant Spec:

Mopar Antifreeze/Coolant (HOAT - Hybrid Organic Additive Technology) or equivalent.

Power Steering Fluid:

Mopar Power Steering Fluid or equivalent.

Brake Fluid Type:

DOT 3.

Common Issues List:

Cracked cylinder heads (4.7L V8), oil filter housing leaks, transmission solenoid pack issues, water pump leaks, front suspension wear (ball joints, control arm bushings), ABS sensor failures, power window regulator failures.

Tip For Known Issues:

The manual provides diagnostic procedures and repair steps specifically addressing these common WG Grand Cherokee issues, saving owners costly guesswork.

📚 Vehicle History

Jeep Legacy:

Jeep's heritage is rooted in robust off-road vehicles, starting with the Willys MB during WWII, evolving into civilian 4x4s known for ruggedness and capability.

Wg Generation Context:

The WG, or second generation Grand Cherokee (1999-2004), marked a significant evolution from the ZJ, featuring a more refined unibody chassis (based on Mercedes-Benz M-Class components), improved interior comfort, and enhanced on-road manners while retaining off-road capabilities.

Production Years:

1999 - 2004

Manufacturing Locations:

Jefferson North Assembly Plant, Detroit, Michigan, USA; various international assembly points.

🏆 Awards & Recognition

Motor Trend SUV Of The Year Lineage:

While the second generation Grand Cherokee (WG) itself may not have won a specific 'SUV of the Year' award in 2004, the Grand Cherokee lineage has consistently been recognized for its blend of on-road comfort and off-road capability by various automotive publications over its history.

Consumer Reports Historical Performance:

Consumer Reports reviews historically indicated average to below-average reliability for the WG generation, particularly concerning the 4.7L V8 engine and certain transmission components. The manual is crucial for addressing these potential issues proactively.