2018 Hyundai Sonata Service and Repair Manual

2018 Hyundai Sonata service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.

What’s included

• Step-by-step repair procedures and service information
• Specifications and reference data (where provided)
• Electrical diagnostics with wiring diagrams
• Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more

Trims covered

• GL Sedan 4-Door
• Premium Sedan 4-Door
• Plug-In Hybrid Sedan 4-Door
• Limited 2.0T Sedan 4-Door
• GLS Sedan 4-Door
• Plug-In Hybrid Limited Sedan 4-Door
• SE Sedan 4-Door
• Hybrid GLS Sedan 4-Door
• Hybrid Limited Sedan 4-Door
• Eco Sedan 4-Door
• Hybrid GL Sedan 4-Door
• Sport 2.0T Sedan 4-Door
• 2.4 Sport Sedan 4-Door
• SEL Sedan 4-Door
• Sport Sedan 4-Door
• Hybrid SE Sedan 4-Door
• Limited Sedan 4-Door
• 2.0T Sport Sedan 4-Door

Engines covered

• 2.4L 2359CC l4 GAS DOHC Naturally Aspirated
• 2.0L 1999CC l4 PLUG-IN HYBRID EV-GAS (PHEV) DOHC Naturally Aspirated
• 2.0L 1998CC 122Cu. In. l4 GAS DOHC Turbocharged
• 2.0L 1999CC l4 FULL HYBRID EV-GAS (FHEV) DOHC Naturally Aspirated
• 1.6L 1591CC 97Cu. In. l4 GAS DOHC Turbocharged

Index / Table of contents

• Body
• Brakes
• Chassis Electrical
• Driveline
• Engine Cooling
• Engine Electrical
• Engine Mechanical
• Engine Performance & Emission Controls
• Fuel System
• General Information & Identification
• Heating, Ventilation, & Air Conditioning
• Hybrid & Electric Vehicle Systems
• Steering
• Suspension
• Transmission, Clutch, & Transfer Case
• Wiring Diagrams