2019 Chevrolet Silverado 3500HD Key Fob Programming Guide

As an ASE-certified electrical technician and professional locksmith, I’ve programmed hundreds of GM trucks. The 2019 Chevrolet Silverado 3500HD is a heavy-duty workhorse, and unlike the 1500 model which transitioned to an entirely new body style that year, the 3500HD largely stayed on the K2XX platform. This is good news for you, as it means the key systems are familiar, well-documented, and in many cases, user-friendly for DIYers.

Below is your comprehensive guide to programming a new key fob for your 2019 Chevy Silverado 3500HD.

Quick reference

Step-by-step on-board programming

If you have a standard flip-key (turn-key ignition) and you currently possess at least one recognized, working key, you can easily add a new key yourself. The new key must be physically cut to match your ignition before you begin this process.

Add-A-Key Procedure (Standard Ignition):

1. Insert your original, working key into the ignition.
2. Turn the ignition to the ON/RUN position (do not crank the engine). Wait for the security light on the dashboard to turn off (usually takes a few seconds).
3. Turn the ignition to the OFF position and remove the working key.
4. Within 10 seconds, insert your newly cut, unprogrammed key into the ignition and turn it to the ON/RUN position.
5. Watch the dashboard. The security light will turn on and then turn off. Once the light goes out, the new transponder is programmed.
6. Turn the ignition OFF and remove the key.
7. Test the new key by starting the vehicle and testing the remote lock/unlock buttons.

Note: For models equipped with push-to-start (Smart Keys), the procedure is typically done via the Driver Information Center (DIC) or by placing the new fob in the center console transmitter pocket. However, many 2019 Smart Key models require a dealer or locksmith scan tool due to enhanced security protocols.

Battery replacement

If your current fob is just losing range, you likely only need a new battery. The 2019 Silverado 3500HD fobs take a standard CR2032 battery.

1. Flip open the metal key blade (if applicable) or remove the emergency key blade from the bottom of the smart fob.
2. Look for the small notch or seam in the plastic housing near where the key blade rests.
3. Use a flathead screwdriver or a trim-pry tool to gently twist and separate the two halves of the key fob casing.
4. Remove the old CR2032 battery.
5. Insert the new battery with the positive (+) side facing up (or matching the orientation of the original).
6. Snap the two halves of the key fob firmly back together.

Where to buy a replacement fob

When sourcing a new key fob, you have three primary options:

• The Dealership: The safest but most expensive route. An OEM key fob from a Chevy dealer will typically cost between $150 and $250, plus an additional $100 to $150 if they require you to pay for programming.
• An Automotive Locksmith: A great middle-ground. Locksmiths carry OEM or high-quality aftermarket fobs (like ILCO). They can supply, cut, and program the key on-site for around $120 to $180 total.
• Online Retailers (Amazon/eBay): The most budget-friendly option. You can buy aftermarket replacement fobs for $20 to $50. However, you will still need to pay a locksmith to cut the HU100 high-security blade (usually $30-$50). Pros: Cheap. Cons: Lower build quality, and occasionally the internal transponders fail out of the box, meaning you might pay for a cut on a key that won't program.

If on-board programming isn't supported

If you have lost all your keys, or if you have a specific Smart Key trim level that blocks DIY programming, you cannot use the on-board add-a-key method. The vehicle’s immobilizer system will lock you out to prevent theft.

In an "all keys lost" scenario, a professional must use a specialized bidirectional scan tool (like an Autel IM608 or Smart Pro) or the official GM SPS2 software to securely access the vehicle's Immobilizer system. This process usually requires a 10 to 12-minute security wait time built into the software before the truck will accept new keys. Expect to pay a locksmith between $200 and $300 to come to your location, cut a new key by VIN or lock code, and program the system from scratch.

Find a mobile locksmith or shop on Repairius.