Repair and Diagnosis

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• Quick Lookups
  • Common Specs & Procedures
  • DTC Index - 2500HD & 3500HD
  • Fluids
  • Technical Bulletins
    • Campaigns
    • Safety Recalls
    • Technical Service Bulletins
  • Tire Fitment
  • Wiring Diagrams
    • Connector End Views & Electrical Component Locations (1 Of 11)
    • Connector End Views & Electrical Component Locations (10 Of 11)
    • Connector End Views & Electrical Component Locations (11 Of 11)
    • Connector End Views & Electrical Component Locations (2 Of 11)
    • Connector End Views & Electrical Component Locations (3 Of 11)
    • Connector End Views & Electrical Component Locations (4 Of 11)
    • Connector End Views & Electrical Component Locations (5 Of 11)
    • Connector End Views & Electrical Component Locations (6 Of 11)
    • Connector End Views & Electrical Component Locations (7 Of 11)
    • Connector End Views & Electrical Component Locations (8 Of 11)
    • Connector End Views & Electrical Component Locations (9 Of 11)
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Accessories & Equipment
  • Anti-Theft Systems
    • Power Locks (Service Information) - 2500HD & 3500HD
    • Vehicle Theft Security (Service Information) - 2500HD & 3500HD
  • Collision/Avoidance
    • (Park Assist Module (PAM) (PTS/PAM) - Electrical Diagnostics - 2500HD & 3500HD)
    • Audio/Video/Entertainment/Connectivity (Service Information) - 2500HD & 3500HD
    • Chime/Buzzer/Driver Assist (Service Information) - 2500HD & 3500HD
  • Communication Devices
    • (Driver Door Module (DDM) (DMFL/R) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Drivetrain Control Module (DTCM) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Passenger Door Module (PDM) (DMFL/R) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Vehicle System Interface Module (VSIM) Module - Electrical Diagnostics - 2500HD & 3500HD)
    • Body Control Module (BCM) - Communication Pre-Diagnostic Procedure & Body Verification Test - 2500HD & 3500HD
    • Body Control Module (BCM) - Diagnostic Code Index - 2500HD & 3500HD
    • Body Control Module (BCM) - DTCS B1208-11 To B182C-12 - 2500HD & 3500HD
    • Body Control Module (BCM) - DTCS B182C-13 To U1433-24 - 2500HD & 3500HD
    • Communication - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Electronic Control Modules (Service Information) - 2500HD & 3500HD
    • Message Center (Service Information) - 2500HD & 3500HD
    • Navigation/Telecommunication (Service Information) - 2500HD & 3500HD
  • Cruise Control Systems
    • Speed Control (Service Information) - 2500HD & 3500HD
  • Drivers Assistance Systems - ADAS
    • (Park Assist Module (PAM) (PTS/PAM) - Electrical Diagnostics - 2500HD & 3500HD)
    • Audio/Video/Entertainment/Connectivity (Service Information) - 2500HD & 3500HD
    • Chime/Buzzer/Driver Assist (Service Information) - 2500HD & 3500HD
  • Entertainment Systems
    • (Amplifier (Amp) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Audio (Radio) - Electrical Diagnostics - 2500HD & 3500HD)
    • (External Audio/Video Module - Electrical Diagnostics - 2500HD & 3500HD)
    • (Integrated Center Stack Screen Module - Electrical Diagnostics - 2500HD & 3500HD)
    • (Radio Frequency (RF Hub) Module - Electrical Diagnostics - 2500HD & 3500HD)
    • Audio/Video - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Audio/Video/Entertainment/Connectivity (Service Information) - 2500HD & 3500HD
  • Exterior Lights
    • Lamps/Lighting - Exterior (Service Information) - 2500HD & 3500HD
  • Gauges & Instrument Panels
    • (Instrument Cluster - Electrical Diagnostics - 2500HD & 3500HD)
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Instrument Cluster (Service Information) - 2500HD & 3500HD
    • Message Center (Service Information) - 2500HD & 3500HD
    • Navigation/Telecommunication (Service Information) - 2500HD & 3500HD
    • Universal Transmitter - 2500HD & 3500HD
  • Headlights
    • Lamps/Lighting - Exterior (Service Information) - 2500HD & 3500HD
  • Heated Glass/Defoggers
    • Heated Glass (Service Information) - 2500HD & 3500HD
  • Horns
    • Horn System (Service Information) - 2500HD & 3500HD
  • Infotainment
    • (Amplifier (Amp) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Audio (Radio) - Electrical Diagnostics - 2500HD & 3500HD)
    • (External Audio/Video Module - Electrical Diagnostics - 2500HD & 3500HD)
    • (Integrated Center Stack Screen Module - Electrical Diagnostics - 2500HD & 3500HD)
    • (Radio Frequency (RF Hub) Module - Electrical Diagnostics - 2500HD & 3500HD)
    • Audio/Video - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Audio/Video/Entertainment/Connectivity (Service Information) - 2500HD & 3500HD
    • Message Center (Service Information) - 2500HD & 3500HD
    • Navigation/Telecommunication (Service Information) - 2500HD & 3500HD
    • Passive Entry Module (PEM) (Service Information) - 2500HD & 3500HD
    • Universal Transmitter - 2500HD & 3500HD
  • Interior/Exterior Trim
    • Body - Interior & Exterior - 2500HD & 3500HD
  • Interior/Illumination Lights
    • Lamps/Lighting - Interior (Service Information) - 2500HD & 3500HD
  • Mirrors
    • Heated Mirrors (Service Information) - 2500HD & 3500HD
    • Power Mirrors (Service Information) - 2500HD & 3500HD
  • Seats
    • (Heated Seat Module (HSM) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Memory Seat Module (MSMD) - Electrical Diagnostics - 2500HD & 3500HD)
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Heated Seats (Service Information) - 2500HD & 3500HD
    • Heated/Cooled Accessories (Service Information) - 2500HD & 3500HD
    • Power Seats (Service Information) - 2500HD & 3500HD
  • Warning Systems
    • Chime/Buzzer/Driver Assist (Service Information) - 2500HD & 3500HD
    • Tires & Wheels (Service Information) - 2500HD & 3500HD
  • Window Motors & Regulators
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Power Windows (Service Information) - 2500HD & 3500HD
  • Wiper/Washer Systems
    • Wiper System & Washer System (Service Information) - 2500HD & 3500HD
• Body & Frame
  • Door Locks
    • Power Locks (Service Information) - 2500HD & 3500HD
    • Vehicle Theft Security (Service Information) - 2500HD & 3500HD
  • Exterior Body Panels
    • Body - Interior & Exterior - 2500HD & 3500HD
  • Exterior/Interior Trim
    • Body - Interior & Exterior - 2500HD & 3500HD
  • Frames, Subframes & Crossmembers
    • Frame And Bumpers - 2500HD & 3500HD
  • Mirrors
    • Heated Mirrors (Service Information) - 2500HD & 3500HD
    • Power Mirrors (Service Information) - 2500HD & 3500HD
  • Seats
    • (Heated Seat Module (HSM) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Memory Seat Module (MSMD) - Electrical Diagnostics - 2500HD & 3500HD)
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Heated Seats (Service Information) - 2500HD & 3500HD
    • Heated/Cooled Accessories (Service Information) - 2500HD & 3500HD
    • Power Seats (Service Information) - 2500HD & 3500HD
  • Sun Roof/T-Top/Convertible Top
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Power Top/Sunroof (Service Information) - 2500HD & 3500HD
  • Windows
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Power Windows (Service Information) - 2500HD & 3500HD
• Brakes
  • Anti-Lock Brakes
    • (Antilock Brake System (Abs) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Integrated Trailer Brake Module (ITBM) - Electrical Diagnostics) - 2500HD & 3500HD
    • Antilock Brake System (Abs) (Service Information) - 2500HD & 3500HD
  • Brakes Control Systems
    • Antilock Brake System (Abs) (Service Information) - 2500HD & 3500HD
  • Mechanical - Hydraulic
    • Base Brakes (Service Information) - 2500HD & 3500HD
  • Parking Brake System
    • Base Brakes (Service Information) - 2500HD & 3500HD
  • Traction Control
    • (Antilock Brake System (Abs) - Electrical Diagnostics - 2500HD & 3500HD)
    • (Integrated Trailer Brake Module (ITBM) - Electrical Diagnostics) - 2500HD & 3500HD
    • Antilock Brake System (Abs) (Service Information) - 2500HD & 3500HD
• Drivelines & Axles
  • Differentials & Drive Axles
    • Front Axle - 2500HD & 3500HD
    • Rear Axle - 292 Aa (11 1/2) - 2500HD & 3500HD
    • Rear Axle - 300 Aa (11.8) - 2500HD & 3500HD
  • Driveshaft & Universal Joints
    • Propeller Shaft - 2500HD & 3500HD
  • Wheel Hubs
    • Front Suspension - 2500HD & 3500HD
    • Rear Suspension - 2500HD & 3500HD
• Electrical
  • Body Electrical
    • Circuit Testing Procedures - Non-DTC-Based Diagnostics - 2500HD & 3500HD
    • Connector End Views & Electrical Component Locations (1 Of 11)
    • Connector End Views & Electrical Component Locations (10 Of 11)
    • Connector End Views & Electrical Component Locations (11 Of 11)
    • Connector End Views & Electrical Component Locations (2 Of 11)
    • Connector End Views & Electrical Component Locations (3 Of 11)
    • Connector End Views & Electrical Component Locations (4 Of 11)
    • Connector End Views & Electrical Component Locations (5 Of 11)
    • Connector End Views & Electrical Component Locations (6 Of 11)
    • Connector End Views & Electrical Component Locations (7 Of 11)
    • Connector End Views & Electrical Component Locations (8 Of 11)
    • Connector End Views & Electrical Component Locations (9 Of 11)
    • Power Distribution - 2500HD & 3500HD
    • Special Tools - Electrical - 2500HD & 3500HD
  • Charging Systems
    • Battery System (Service Information) - 2500HD & 3500HD
    • Charging (Service Information) - 2500HD & 3500HD
  • Fuses & Circuit Breakers
    • Connector End Views & Electrical Component Locations (1 Of 11)
    • Connector End Views & Electrical Component Locations (10 Of 11)
    • Connector End Views & Electrical Component Locations (11 Of 11)
    • Connector End Views & Electrical Component Locations (2 Of 11)
    • Connector End Views & Electrical Component Locations (3 Of 11)
    • Connector End Views & Electrical Component Locations (4 Of 11)
    • Connector End Views & Electrical Component Locations (5 Of 11)
    • Connector End Views & Electrical Component Locations (6 Of 11)
    • Connector End Views & Electrical Component Locations (7 Of 11)
    • Connector End Views & Electrical Component Locations (8 Of 11)
    • Connector End Views & Electrical Component Locations (9 Of 11)
    • Vehicle Quick Reference - 2500HD & 3500HD
  • Gauges
    • (Instrument Cluster - Electrical Diagnostics - 2500HD & 3500HD)
    • Body - Interior & Exterior - 2500HD & 3500HD
    • Instrument Cluster (Service Information) - 2500HD & 3500HD
    • Message Center (Service Information) - 2500HD & 3500HD
    • Navigation/Telecommunication (Service Information) - 2500HD & 3500HD
    • Universal Transmitter - 2500HD & 3500HD
  • Horns
    • Horn System (Service Information) - 2500HD & 3500HD
  • Motors, Switches, Relays
    • Circuit Testing Procedures - Non-DTC-Based Diagnostics - 2500HD & 3500HD
    • Connector End Views & Electrical Component Locations (1 Of 11)
    • Connector End Views & Electrical Component Locations (10 Of 11)
    • Connector End Views & Electrical Component Locations (11 Of 11)
    • Connector End Views & Electrical Component Locations (2 Of 11)
    • Connector End Views & Electrical Component Locations (3 Of 11)
    • Connector End Views & Electrical Component Locations (4 Of 11)
    • Connector End Views & Electrical Component Locations (5 Of 11)
    • Connector End Views & Electrical Component Locations (6 Of 11)
    • Connector End Views & Electrical Component Locations (7 Of 11)
    • Connector End Views & Electrical Component Locations (8 Of 11)
    • Connector End Views & Electrical Component Locations (9 Of 11)
    • Power Distribution - 2500HD & 3500HD
    • Special Tools - Electrical - 2500HD & 3500HD
  • Starter
    • Starting - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Starting (Service Information) - 2500HD & 3500HD
  • Wiring Diagrams
    • Connector End Views & Electrical Component Locations (1 Of 11)
    • Connector End Views & Electrical Component Locations (10 Of 11)
    • Connector End Views & Electrical Component Locations (11 Of 11)
    • Connector End Views & Electrical Component Locations (2 Of 11)
    • Connector End Views & Electrical Component Locations (3 Of 11)
    • Connector End Views & Electrical Component Locations (4 Of 11)
    • Connector End Views & Electrical Component Locations (5 Of 11)
    • Connector End Views & Electrical Component Locations (6 Of 11)
    • Connector End Views & Electrical Component Locations (7 Of 11)
    • Connector End Views & Electrical Component Locations (8 Of 11)
    • Connector End Views & Electrical Component Locations (9 Of 11)
    • System Wiring Diagrams
    • Using lemon2025'S System Wiring Diagrams
• Engine Mechanical
  • Accessory Drive Belts
    • Cooling System - 2500HD & 3500HD
  • Cooling Fan
    • Cooling System - 2500HD & 3500HD
  • Cooling System (Mechanical)
    • Cooling System - 2500HD & 3500HD
  • Exhaust System - 2500HD & 3500HD
  • Fuel System - 2500HD & 3500HD
  • Mechanical
    • 6.4L Engine (Service Information) - 2500HD & 3500HD
    • Cooling System - 2500HD & 3500HD
    • Fuel System - 2500HD & 3500HD
  • Starter
    • Starting - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Starting (Service Information) - 2500HD & 3500HD
• Engine Performance
  • Emissions
    • Emission Applications - Gas
    • Emission Control Abbreviations
    • State Emission Standards - Diesel
    • State Emission Standards - Gas
  • Fuel Delivery
    • Fuel System - 2500HD & 3500HD
  • Ignition System (Service Information) - 2500HD & 3500HD
  • Specifications
    • Firing Order & Cylinder Identification
  • System
    • 6.4L - Diagnostic Code Index - 2500HD & 3500HD
    • 6.4L - DTCS P000B To P0208 - 2500HD & 3500HD
    • 6.4L - DTCS P0221 To P0580 - 2500HD & 3500HD
    • 6.4L - DTCS P0581 To P1722 - 2500HD & 3500HD
    • 6.4L - DTCS P1724 To P2610 - 2500HD & 3500HD
    • 6.4L - DTCS P2634 To U1449 - 2500HD & 3500HD
    • 6.4L - Intermittent Condition, Pcm/ECM Reprogramming - Gas, Powertrain Verification Test & Pre-Diagnostic Troubleshooting Procedure - 2500HD & 3500HD
    • DRIVEABILITY - Gas - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Emissions Control - 2500HD & 3500HD
  • Testing & Diagnosis
    • 6.4L - Diagnostic Code Index - 2500HD & 3500HD
    • 6.4L - DTCS P000B To P0208 - 2500HD & 3500HD
    • 6.4L - DTCS P0221 To P0580 - 2500HD & 3500HD
    • 6.4L - DTCS P0581 To P1722 - 2500HD & 3500HD
    • 6.4L - DTCS P1724 To P2610 - 2500HD & 3500HD
    • 6.4L - DTCS P2634 To U1449 - 2500HD & 3500HD
    • 6.4L - Intermittent Condition, Pcm/ECM Reprogramming - Gas, Powertrain Verification Test & Pre-Diagnostic Troubleshooting Procedure - 2500HD & 3500HD
    • DRIVEABILITY - Gas - Non-DTC Based Diagnostics - 2500HD & 3500HD
    • Emissions Control - 2500HD & 3500HD
  • Tune-Up
    • Ignition System (Service Information) - 2500HD & 3500HD
• 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
  • 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 - 2500HD & 3500HD
  • 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
    • Vehicle Quick Reference - 2500HD & 3500HD
  • Identification
    • CANADIAN Model Cross-Reference
    • Vehicle Quick Reference - 2500HD & 3500HD
  • Metric Conversions
    • Engine Displacement Conversion Table - ECAT
    • Metric Conversions
  • OEM General Information
    • (Fleet Telematics Module (FTM) - Electrical Diagnostics 2500HD & 3500HD)
    • (Security Gateway Module (SGW) - 2500HD & 3500HD)
    • Automatic Stop/Start Disable
    • Circuit Testing Procedures - Non-DTC-Based Diagnostics - 2500HD & 3500HD
    • Pre-Diagnostic Troubleshooting Procedure & Testing For An Intermittent Condition - 2500HD & 3500HD
    • Vehicle Data - 2500HD & 3500HD
    • Vehicle Quick Reference - 2500HD & 3500HD
  • Reset Procedures
    • Maintenance Reminder Light (Reset Procedures)
    • Tire Pressure Monitor Systems
  • Specifications Index
    • Common Specs & Procedures
  • Steering
    • Map - Steering, Suspension, Wheel Alignment, Wheels & Tires
    • Wheel Alignment Theory & Operation - General Information
  • Towing
    • Vehicle Quick Reference - 2500HD & 3500HD
  • Traction Control Disable
    • Traction Control, 4WD, & AWD
  • Trouble Shooting - Manual Transmission - General Information
• Heating, Ventilation & A/C (HVAC)
  • A/C Compressor
    • Heating And Air Conditioning - 2500HD & 3500HD
  • General Servicing
    • Heating And Air Conditioning - 2500HD & 3500HD
  • HVAC Control Systems
    • (Heating & Air Conditioning - Electrical Diagnostics - 2500HD & 3500HD)
    • Heating And Air Conditioning - 2500HD & 3500HD
• Maintenance
  • Procedures
    • Maintenance Reminder Light (Reset Procedures)
    • Vehicle Quick Reference - 2500HD & 3500HD
• Restraints
  • Air Bag, SRS
    • Occupant Restraint Controller (Orc) - Diagnostic Code Index - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - DTCS B0001-11 To B0095-9A - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - DTCS B0099-96 To U1601-00 - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - Restraints System Intermittent Test, Pre-Diagnostic Procedure & Verification Test - 2500HD & 3500HD
    • Restraints (Service Information) - 2500HD & 3500HD
  • Passive Restraints
    • Restraints (Service Information) - 2500HD & 3500HD
  • Restraints Control Systems
    • Occupant Restraint Controller (Orc) - Diagnostic Code Index - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - DTCS B0001-11 To B0095-9A - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - DTCS B0099-96 To U1601-00 - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - Restraints System Intermittent Test, Pre-Diagnostic Procedure & Verification Test - 2500HD & 3500HD
    • Restraints (Service Information) - 2500HD & 3500HD
  • Seat Belts
    • Occupant Restraint Controller (Orc) - Diagnostic Code Index - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - DTCS B0001-11 To B0095-9A - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - DTCS B0099-96 To U1601-00 - 2500HD & 3500HD
    • Occupant Restraint Controller (Orc) - Restraints System Intermittent Test, Pre-Diagnostic Procedure & Verification Test - 2500HD & 3500HD
    • Restraints (Service Information) - 2500HD & 3500HD
• Steering
  • Electronic Steering
    • (Steering Control Module (SCM) - Electrical Diagnostics - 2500HD & 3500HD)
  • Manual Steering
    • Steering System - 2500HD & 3500HD
  • Power Steering
    • Steering System - 2500HD & 3500HD
  • Steering Column
    • Steering System - 2500HD & 3500HD
  • Steering Gear
    • Steering System - 2500HD & 3500HD
  • Steering Linkage
    • Steering System - 2500HD & 3500HD
• Suspension
  • Front Suspension - 2500HD & 3500HD
  • Rear Suspension - 2500HD & 3500HD
  • Suspension Control Systems
    • (Air Suspension Control Module (ASCM) - Electrical Diagnostics - 2500HD & 3500HD)
  • Wheel Alignment
    • Front Suspension - 2500HD & 3500HD
    • Ram Wheel Alignment Specifications - 2500 Pickup
  • Wheels & Tire System
    • Tires & Wheels (Service Information) - 2500HD & 3500HD
• Transmission
  • Automatic Trans
    • (66RFE Automatic Transmission - Powertrain Control Module (Pcm) - Electrical Diagnostics - 2500HD & 3500HD)
    • 66RFE Automatic Transmission (Service Information) - 2500HD & 3500HD
    • Cooling System - 2500HD & 3500HD
  • Transfer Case
    • BW44-47 Transfer Case (Service Information) - 2500HD & 3500HD
    • Final Drive Control Module (FDCM) - Electrical Diagnostics - 2500 Hd
  • Transmission Control Systems
    • 66RFE Automatic Transmission (Service Information) - 2500HD & 3500HD
• External Pages