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.
2021 Honda Ridgeline RTL, FWDFACTORY OEM SERVICE PROCEDURE
Repair and Diagnosis
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Quick Lookups
- Accessories & Equipment
- Anti-Theft Systems
- Keyless Access (Backup Control Unit) - Diagnostics
- Keyless Access (Power Control Unit) - Diagnostics
- Keyless Access Control Unit - Diagnostics
- Keyless Access System - Testing & Troubleshooting
- Security System / Keyless Entry System - Service Information
- Security System / Keyless Entry System - Testing & Troubleshooting
- Collision/Avoidance
- Communication Devices
- Can Gateway - Advanced Diagnostics
- Can Gateway - Diagnostics
- Integrated Control Systems - Service Information
- Integrated Control Systems - Testing & Troubleshooting
- Multiplex Integrated Control Unit (Door) - Diagnostics
- Multiplex Integrated Control Unit (MICU) - Diagnostics
- Network Communication - Service Information
- Network Communication - Testing & Troubleshooting
- Cruise Control Systems
- Drivers Assistance Systems - ADAS
- Entertainment Systems
- Audio / Visual System - Connector Views / Diagrams
- Audio / Visual System - Service Information
- Audio Visual Systems - Testing & Troubleshooting
- Audio Visual Systems - Troubleshooting
- Audio-Navigation System - Diagnostics
- HANDSFREELINK System - Testing & Troubleshooting
- HANDSFREELINK System - Troubleshooting - Introduction
- Multipurpose Camera Unit - Diagnostics
- Exterior Lights
- Gauges & Instrument Panels
- Headlights
- Infotainment
- Audio / Visual System - Connector Views / Diagrams
- Audio / Visual System - Service Information
- Audio Visual Systems - Testing & Troubleshooting
- Audio Visual Systems - Troubleshooting
- Audio-Navigation System - Diagnostics
- HANDSFREELINK System - Testing & Troubleshooting
- HANDSFREELINK System - Troubleshooting - Introduction
- Multipurpose Camera Unit - Diagnostics
- Navigation System - Troubleshooting - Introduction
- Navigation Systems - Testing & Troubleshooting
- Interior/Exterior Trim
- Interior/Illumination Lights
- Mirrors
- Seats
- Window Motors & Regulators
- Anti-Theft Systems
- Body & Frame
- Door Locks
- Keyless Access (Backup Control Unit) - Diagnostics
- Keyless Access (Power Control Unit) - Diagnostics
- Keyless Access Control Unit - Diagnostics
- Keyless Access System - Testing & Troubleshooting
- Security System / Keyless Entry System - Service Information
- Security System / Keyless Entry System - Testing & Troubleshooting
- Exterior Body Panels
- Exterior/Interior Trim
- Frames, Subframes & Crossmembers
- Mirrors
- Seats
- Sun Roof/T-Top/Convertible Top
- Windows
- Door Locks
- Brakes
- Drivelines & Axles
- Electrical
- Engine Mechanical
- Cooling System (Mechanical)
- Exhaust
- Fuel System
- Lubrication System
- Mechanical
- Active Control Engine Mount - Service Information
- Active Control Engine Mount - Testing & Troubleshooting
- Active Control Engine Mount System - Advanced Diagnostics
- Active Control Engine Mount System - DTC Diagnostics
- Cylinder Head Assembly - Components Location
- Cylinder Head Assembly - Service Information
- Engine Control System / Engine Mechanical - Service Information
- Engine Mechanical Service Specifications
- Intake System / Exhaust System - Components Location
- Intake System / Exhaust System - Service Information
- Timing Belt - Service Information
- Timing Belt Pulleys - Service Information
- Starter
- Timing Belt
- Engine Performance
- Emissions
- Engine Control Systems
- Fuel Delivery
- Ignition System
- Remove, Overhaul & Install
- Specifications
- System
- Engine Control System - Advanced Diagnostics (P0069 - P050D)
- Engine Control System - Advanced Diagnostics (P0521 - P1683)
- Engine Control System - Advanced Diagnostics (P1684 - U129E)
- Engine Control System - DTC Diagnostics (DTC P0069 - P0141)
- Engine Control System - DTC Diagnostics (DTC P0141 - P0300)
- Engine Control System - DTC Diagnostics (DTC P0300 - P060A)
- Engine Control System - DTC Diagnostics (DTC P0615 - P15C9)
- Engine Control System - DTC Diagnostics (DTC P1658 - P2238)
- Engine Control System - DTC Diagnostics (DTC P2238 - U0301)
- Engine Control System / Engine Mechanical - Testing & Troubleshooting
- Testing & Diagnosis
- Engine Control System - Advanced Diagnostics (P0069 - P050D)
- Engine Control System - Advanced Diagnostics (P0521 - P1683)
- Engine Control System - Advanced Diagnostics (P1684 - U129E)
- Engine Control System - DTC Diagnostics (DTC P0069 - P0141)
- Engine Control System - DTC Diagnostics (DTC P0141 - P0300)
- Engine Control System - DTC Diagnostics (DTC P0300 - P060A)
- Engine Control System - DTC Diagnostics (DTC P0615 - P15C9)
- Engine Control System - DTC Diagnostics (DTC P1658 - P2238)
- Engine Control System - DTC Diagnostics (DTC P2238 - U0301)
- Engine Control System / Engine Mechanical - Testing & Troubleshooting
- Tune-Up
- General Information
- Abbreviations
- Basic Trouble Shooting
- Brakes
- Check Lists
- Driveline/Axles
- DTC Index
- Electrical
- Engine
- Engine Performance
- Electrostatic Discharge Warning - General Information
- Engine Performance Diagnostic Routine Outline - General Information
- Engine Performance Safety Precautions
- Map - Engine Performance & Maintenance
- Parasitic Load Explanation & Test Procedures - General Information
- State Emission Standards - Diesel
- State Emission Standards - Gas
- Waveforms - Injector Pattern Tutorial - General Information
- Map - Exhaust Systems
- Heating, Ventilation & A/C (HVAC)
- Identification
- Metric Conversions
- OEM General Information
- Maintenance Reminder Light (Reset Procedures)
- Specifications Index
- Steering
- Traction Control Disable Procedures
- Trouble Shooting - Manual Transmission - General Information
- Heating, Ventilation & A/C (HVAC)
- Maintenance
- Restraints
- Steering
- Suspension
- Transmission
Factory Service Tools
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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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