2018 Ram 3500 Key Fob Programming Guide

Quick Reference

Step-by-step On-Board Programming

The 2018 Ram 3500 does not support DIY on-board programming for its key fobs. The sophisticated security system in your truck requires specialized diagnostic equipment to program new key fobs. This means you'll need to visit a dealership or a professional automotive locksmith to get your new fob programmed.

Trying to program a key fob without the proper tools can result in various issues, including preventing the vehicle from starting. The vehicle's Powertrain Control Module (PCM) and Immobilizer Control Module need to be properly interfaced with a compatible scan tool to securely register the new key fob and its integrated immobilizer transponder.

Battery Replacement

Replacing the battery in your 2018 Ram 3500 key fob is a straightforward process:

1. Locate the release button: On the side of the key fob, you'll find a small button. Press and hold it.
2. Slide out the emergency key: While holding the button, pull out the emergency key blade from the top of the fob.
3. Separate the fob halves: Using a small, flat-head screwdriver or a coin, carefully pry apart the two halves of the key fob. There's usually a small notch where you can insert the tool.
4. Remove the old battery: Gently pry out the old CR2450 battery. Note its orientation (positive side up/down) before removing.
5. Insert the new battery: Place the new CR2450 battery into the fob with the positive (+) side facing the same way as the old battery.
6. Reassemble the fob: Carefully snap the two halves of the key fob back together until you hear a click. Reinsert the emergency key blade.

Test your key fob functions to ensure the new battery is working correctly.

Where to Buy a Replacement Fob

When you need a new key fob for your 2018 Ram 3500, you have a few options, each with pros and cons:

• Ram Dealership:

  • Pros: Guaranteed genuine OEM part, expert programming with factory tools, warranty on parts and labor.
  • Cons: Most expensive option. Expect to pay anywhere from $250 to $400+ for the fob and programming.

• Automotive Locksmith:

  • Pros: Often more affordable than a dealership, can program both OEM and high-quality aftermarket fobs, many offer mobile services.
  • Cons: Quality of aftermarket fobs can vary, so choose a reputable locksmith. Costs typically range from $150 to $300 for the fob and programming.

• Online Retailers (e.g., Amazon, eBay):

  • Pros: Can find fobs at significantly lower prices (sometimes $50-$100 for just the fob).
  • Cons: You're only buying the physical fob; you'll still need to pay a locksmith or dealer for cutting the emergency blade and programming. Risk of receiving a low-quality or incompatible aftermarket fob. Always verify FCC ID and part numbers. This is generally the best option if you plan to have a locksmith program it for you.

If On-Board Programming Isn't Supported

Since your 2018 Ram 3500 requires a scan tool for key fob programming, understanding the costs and the role of the immobilizer transponder is crucial.

• Cost Expectations: As mentioned above, expect to pay for both the key fob itself and the programming service. The total cost will depend on where you go (dealer vs. locksmith) and whether you source the fob yourself or through them. Always get a quote beforehand.

• Immobilizer Transponder: Every key fob for your Ram 3500 contains an integrated immobilizer transponder chip. This chip communicates with your truck's immobilizer system. If the transponder is not correctly programmed to the vehicle, even if the remote functions work, the truck will not start. The programming process with a scan tool ensures this transponder is properly linked, allowing the vehicle to recognize the key as valid and disarm the immobilizer.

Find a mobile locksmith or shop on Repairius.