2018 Ram 3500 Service and Repair Manual

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Factory-Grade Data

2018 Ram 3500 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 troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Tradesman Cab & Chassis 4-Door
  • SLT Crew Cab Pickup 4-Door
  • Laramie Cab & Chassis 4-Door
  • Big Horn Extended Crew Cab Pickup 4-Door
  • Limited Crew Cab Pickup 4-Door
  • SLT Cab & Chassis 4-Door
  • Tradesman Cab & Chassis 2-Door
  • Laramie Limited Crew Cab Pickup 4-Door
  • Limited Extended Crew Cab Pickup 4-Door
  • Tradesman Crew Cab Pickup 4-Door
  • SLT Standard Cab Pickup 2-Door
  • SLT Cab & Chassis 2-Door
  • Laramie Longhorn Crew Cab Pickup 4-Door
  • ST Cab & Chassis 4-Door
  • SLT Extended Crew Cab Pickup 4-Door
  • Big Horn Crew Cab Pickup 4-Door
  • Laramie Crew Cab Pickup 4-Door
  • ST Cab & Chassis 2-Door
  • Laramie Extended Crew Cab Pickup 4-Door
  • Laramie Longhorn Extended Crew Cab Pickup 4-Door
  • ST Standard Cab Pickup 2-Door
  • ST Crew Cab Pickup 4-Door
  • Laramie Limited Extended Crew Cab Pickup 4-Door
  • Tradesman Standard Cab Pickup 2-Door

Engines covered

  • 5.7L 345Cu. In. V8 GAS OHV Naturally Aspirated
  • 6.4L 6424CC 392Cu. In. V8 GAS OHV Naturally Aspirated
  • 6.7L 408Cu. In. l6 DIESEL OHV 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

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Vehicle Safety Data

2018 Ram 3500 Recalls & Complaints

NHTSA #25V59200011/09/2025Component: AIR BAGS:SIDE/WINDOW:CURTAIN:INFLATOR

Chrysler (FCA US, LLC) is recalling certain 2018 Ram 1500, Ram 2500, and Ram 3500 vehicles. The right and left side curtain air bag inflators may rupture due to a manufacturing defect.

Consequence

An inflator rupture may result in sharp metal fragments striking occupants, resulting in injury.

Remedy

Dealers will replace one or both side curtain air bags, as necessary, free of charge. Owner notifica

NHTSA #19V34700009/05/2019Component: LATCHES/LOCKS/LINKAGES:TAILGATE:LATCH

Chrysler (FCA US LLC) is recalling certain 2015-2017 Ram 1500, 2500 and 3500 pickup trucks equipped with an 8 foot bed and a power locking tailgate. Chrysler is also recalling all 2013-2014 and 2018

Consequence

If the tailgate opens while the vehicle is being driven, cargo may fall out the vehicle and create a

Remedy

Chrysler will notify owners, and dealers will repair the tailgate latch, free of charge. The recall

TSB #11032842

Radio Message "Power Surge On USB Detected" Customers may comment on the following: The radio displays the message: Power surge on USB hub detected Fig. 1. NOTE: After the message appears, no USB devices function in the hub (no charging, no

TSB #11032824

Radio Message "Power Surge On USB Detected" Customers may comment on the following: The radio displays the message: Power surge on USB hub detected Fig. 1. NOTE: After the message appears, no USB devices function in the hub (no charging, no

TSB #11032647

Radio Message "Power Surge On USB Detected" Customers may comment on the following: The radio displays the message: Power surge on USB hub detected Fig. 1. NOTE: After the message appears, no USB devices function in the hub (no charging, no

TSB #11032344

Squeak Or Squawk Noise Coming From Either Side Door Of The Vehicle, It Could Be Just One Door Or More. The Noise Can Be Present In Either The Upper Or The Lower Hinge.

TSB #11031241

Outside Power Fold Rearview Mirror Noise Or Loose At Pivot. Mirror Contacts Door Window Glass In The Folded Position.

TSB #11030026

SPEAKER - NONE

TSB #11030025

SPEAKER - NONE

TSB #11027838

Seatbelt Slow Retraction.

Showing the 8 most recent of 433 technical service bulletins on file with NHTSA.

20250125Component: STRUCTURE:BODYCrash reportedFire reported2 injured

Brakes went out and steering which caused loss of control of vehicle.

20250125Component: SERVICE BRAKESCrash reportedFire reported2 injured

Brakes went out and steering which caused loss of control of vehicle.

20250125Component: STEERINGCrash reportedFire reported2 injured

Brakes went out and steering which caused loss of control of vehicle.

20190701Component: STEERINGCrash reported2 injured

TL* THE CONTACT OWNED A 2018 RAM 3500. THE CONTACT STATED THAT WHILE DRIVING 5 MPH WHILE ON A MOUNTAIN SIDE, WITHIN SECONDS THE VEHICLE TUMBLED DOWN OFF THE CLIFF INTO TREES WHICH STOPPED THE VEHICLE

20230423Component: AIR BAGSCrash reported1 injured1 fatalities

Frontal collision at 45 mph, totaled truck but airbags did not deploy. The insurance company sent the truck to the auction. My safety was at risk. Not that I am aware of, the insurance company has ph

Showing the 5 most serious of 1106 complaints filed with NHTSA.

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