Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures
  • DTC Index
  • Electrical Component Locations
    • Diagnostic Connector (DLC) Locations
    • Electrical Component Locator
    • Wiring Systems (Component Locator)
  • Fluids
  • Technical Bulletins
    • Campaigns
    • Safety Recalls
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • OEM Connector End Views - Connector Index
    • OEM Connector End Views (1 Of 5)
    • OEM Connector End Views (2 Of 5)
    • OEM Connector End Views (3 Of 5)
    • OEM Connector End Views (4 Of 5)
    • OEM Connector End Views (5 Of 5)
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
    • Wiring Systems - Connector End Views
    • Wiring Systems (Diagnostic Information And Procedures)
• Accessories & Equipment
  • Accessories Control Systems
    • Adjustable Pedal System
    • Garage Door Opener System
  • Anti-Theft Systems
    • Door System, Mirror System & Window System
    • Keyless Entry System
    • Theft Deterrent System
    • Theft Deterrent System & Anti-Theft System
  • Communication Devices
    • Body Control System
    • Data Link Communication System
    • Service Programming System
  • Cruise Control Systems
  • Entertainment Systems
    • Cellular Communication System
    • Entertainment System
  • Exterior Lights
    • Lighting Systems
  • Gauges & Instrument Panels
    • Instrument Panel System Displays, Gauges And Console
  • Headlights
    • Lighting Systems
  • Heated Glass/Defoggers
    • Stationary Window System
  • Horns
    • Horn System
  • Ignition Switch/Steering Lock
    • Steering Wheel & Steering Column
  • Infotainment
    • Cellular Communication System
    • Entertainment System
    • Navigation Systems
  • Interior/Exterior Trim
    • Door System, Mirror System & Window System
    • Exterior Trim
    • Instrument Panel System Displays, Gauges And Console
    • Interior Trim
  • Interior/Illumination Lights
    • Lighting Systems
  • Memory Modules
    • Adjustable Pedal System
    • Personalization Systems
  • Mirrors
    • Door System, Mirror System & Window System
    • Stationary Window System
  • Seats
    • Seat System
  • Steering Column Switches
    • Steering Wheel & Steering Column
  • Window Motors & Regulators
    • Door System, Mirror System & Window System
    • Stationary Window System
  • Wiper/Washer Systems
    • Wiper System & Washer System
• Body & Frame
  • Door Locks
    • Door System, Mirror System & Window System
    • Keyless Entry System
    • Theft Deterrent System
    • Theft Deterrent System & Anti-Theft System
  • Exterior Body Panels
    • Body Front End
    • Body Panels - Air/Wind Noise Symptoms
    • Body Rear End
    • Bumper System
    • Squeaks & Rattles
    • Water Leaks
  • Exterior/Interior Trim
    • Door System, Mirror System & Window System
    • Exterior Trim
    • Instrument Panel System Displays, Gauges And Console
    • Interior Trim
  • Frames, Subframes & Crossmembers
    • Frame & Underbody
  • Ignition Switch/Steering Lock
    • Steering Wheel & Steering Column
  • Mirrors
    • Door System, Mirror System & Window System
    • Stationary Window System
  • Seats
    • Seat System
  • Sun Roof/T-Top/Convertible Top
    • Sunroof System
  • Windows
    • Door System, Mirror System & Window System
    • Stationary Window System
• Brakes
  • Anti-Lock Brakes
    • Antilock Brake System And Traction Control System
  • Mechanical - Hydraulic
    • Disc Brake System
    • Hydraulic Brake System
  • Parking Brake System
  • Antilock Brake System And Traction Control System
• Drivelines & Axles
  • Axle Shafts
    • Wheel Drive Shafts
  • Differentials & Drive Axles
    • Drive Axle - Limited-Slip Differential
    • Front Drive Axle
    • Rear Drive Axle
  • Driveshaft & Universal Joints
    • Propeller Shaft And Universal Joints
• Electrical
  • Body Electrical
    • Accessory Power Socket
    • OEM Connector End Views - Connector Index
    • OEM Connector End Views (1 Of 5)
    • OEM Connector End Views (2 Of 5)
    • OEM Connector End Views (3 Of 5)
    • OEM Connector End Views (4 Of 5)
    • OEM Connector End Views (5 Of 5)
    • Retained Accessory Power System
    • Wiring Systems - Connector End Views
    • Wiring Systems (Component Locator)
    • Wiring Systems (Diagnostic Information And Procedures)
  • Charging Systems
    • Battery, Charging System And Starting System
  • Component Locations
    • Diagnostic Connector (DLC) Locations
    • Electrical Component Locator
    • Wiring Systems (Component Locator)
  • Fuses & Circuit Breakers
  • Instrument Panel System Displays, Gauges And Console
  • Horns
    • Horn System
  • Motors, Switches, Relays
    • Accessory Power Socket
    • OEM Connector End Views - Connector Index
    • OEM Connector End Views (1 Of 5)
    • OEM Connector End Views (2 Of 5)
    • OEM Connector End Views (3 Of 5)
    • OEM Connector End Views (4 Of 5)
    • OEM Connector End Views (5 Of 5)
    • Retained Accessory Power System
    • Wiring Systems - Connector End Views
    • Wiring Systems (Component Locator)
    • Wiring Systems (Diagnostic Information And Procedures)
  • Starter
    • Battery, Charging System And Starting System
  • Wiring Diagrams
    • OEM Connector End Views - Connector Index
    • OEM Connector End Views (1 Of 5)
    • OEM Connector End Views (2 Of 5)
    • OEM Connector End Views (3 Of 5)
    • OEM Connector End Views (4 Of 5)
    • OEM Connector End Views (5 Of 5)
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
    • Wiring Systems - Connector End Views
    • Wiring Systems (Diagnostic Information And Procedures)
• Engine Mechanical
  • Accessory Drive Belts
    • Cooling System Specifications & Drive Belt Routing
  • Cooling System (Mechanical)
    • Cooling System Specifications & Drive Belt Routing
    • Engine Cooling System
  • Engine Exhaust System
  • Maintenance & Engine Lubrication System
  • Engine Mechanical - 4.2L (Ll8)
  • Starter
    • Battery, Charging System And Starting System
• Engine Performance
  • Emissions
    • Emission Applications
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Mode 6 - Class 2 & GMLAN
  • Specifications
    • Firing Order & Cylinder Identification
  • System
    • Engine Control System - Diagnosis - 4.2L (DTC P0013 To DTC P0138)
    • Engine Control System - Diagnosis - 4.2L (DTC P0140 To DTC P0506)
    • Engine Control System - Diagnosis - 4.2L (DTC P0507 To DTC P2176)
    • Engine Control System - 4.2L (Introduction)
    • Engine Control System - 4.2L - Troubleshooting & Diagnosis
    • Engine Control System - 4.2L (Diagnostic Information & Procedures)
    • Engine Controls - Strategy Based Engine Diagnosis
  • Testing & Diagnosis
    • Engine Control System - Diagnosis - 4.2L (DTC P0013 To DTC P0138)
    • Engine Control System - Diagnosis - 4.2L (DTC P0140 To DTC P0506)
    • Engine Control System - Diagnosis - 4.2L (DTC P0507 To DTC P2176)
    • Engine Control System - 4.2L (Introduction)
    • Engine Control System - 4.2L - Troubleshooting & Diagnosis
    • Engine Control System - 4.2L (Diagnostic Information & Procedures)
    • Engine Controls - Strategy Based Engine Diagnosis
• General Information
  • Abbreviations
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
  • Basic Trouble Shooting
    • Basic Trouble Shooting - General Information
    • Commonly Used Abbreviations - General Information
    • Emission Control Abbreviations
    • Engine Performance - Trouble Shooting - General Information
  • Brakes
    • Anti-Lock Brake Safety Precautions - General Information
    • Map - Brake Systems
    • Map - Routine Inspection Reference Guide
  • Check Lists
    • Symptom Check List Worksheet - General Information
  • OBD-II Drive Cycles - 4.2L
  • Driveline/Axles
    • Drive Axle Noise Diagnosis - General Information
    • Gear Tooth Contact Patterns - General Information
    • Map - Drive Train & Transmission
    • Trouble Shooting - Clutches - General Information
  • DTC Index
  • Electrical
    • Map - Electrical Systems
    • Using lemon2025'S System Wiring Diagrams
  • Engine
    • Engine Overhaul Procedures - General Information
    • General Cooling System Service - General Information
  • 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)
    • Map - Heating, Ventilation, & Air Conditioning
  • Hoist/Jack
    • General Information
  • Identification
    • CANADIAN Model Cross-Reference
    • General Information
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • Automatic Stop/Start Disable
    • Cautions And Notices
    • Engine Controls - Strategy Based Engine Diagnosis
    • General Information
    • Gm Vehicles Cautions & Notices
    • Vehicle DTC Information
    • Vibration Symptoms Diagnosis And Correction
  • Reset Procedures
    • Maintenance & Engine Lubrication System
    • Maintenance Reminder Light (Reset Procedures)
  • Restraints
    • Supplemental Inflatable Restraint System - Deactivation Procedures
    • Supplemental Inflatable Restraint System Component Inspection & Replacement Tables.
  • RPO Codes
    • General Information
  • Specifications Index
    • Common Specs & Procedures
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Traction Control Disable Procedures
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • General Servicing
    • Cabin Air Filter (Special Applications) - General Information
  • HVAC Control Systems
    • HVAC Systems - Automatic
    • HVAC Systems - General Servicing
    • HVAC Systems - Manual
• Maintenance
  • Procedures
    • Maintenance & Engine Lubrication System
• Restraints
  • Air Bag, SRS
    • Supplemental Inflatable Restraint System
  • Restraints Control Systems
    • Seat Belt System
  • Seat Belts
    • Seat Belt System
• Steering
  • Manual Steering
    • Power Steering System
  • Power Steering System
  • Steering Wheel & Steering Column
• Suspension
  • Electronic Suspension
    • Suspension Control System - Suspension Leveling
  • Front Suspension
    • Front Suspension System
    • Suspension System General Diagnosis
  • Rear Suspension
    • Rear Suspension System
    • Suspension System General Diagnosis
  • Wheel Alignment
    • Wheel Alignment Specifications
    • Wheel Alignment Specifications & Adjustment Procedures
  • Wheels & Tire System
    • Tires & Wheels
• Transmission
  • Automatic Trans
    • Automatic Transmission - 4L60-E/4L65-E (Introduction, Service & Replacement)
    • Automatic Transmission - 4L60-E/4L65-E - Overhaul
    • Automatic Transmission Hydraulic Diagrams - 4L60-E/4L65-E
    • Automatic Transmission, 4L60-E/4L65-E (Diagnostic Information & Procedures)
    • Automatic Transmission, 4L60-E/4L65-E (Troubleshooting)
    • Automatic Transmission, 4L60-E/4L65-E Diagnosis (DTC P0218 To DTC P0748 - 4.2L)
    • Shift Interlock System
  • Hydraulic Diagrams
    • Automatic Transmission - 4L60-E/4L65-E - Overhaul
    • Automatic Transmission Hydraulic Diagrams - 4L60-E/4L65-E
  • Transfer Case
    • Transfer Case - NVG 226-NP8
    • Transfer Case - Overhaul -- NVG 226-NP8
• External Pages