Chrysler 300M Key Fob Programming
Updated 2026 1999–2004 6 model years
Programming steps, the battery it takes, and the exact replacement fob for every Chrysler 300M model year we cover (1999–2004). Find your year in the table, then jump to the details for that generation.
Every Chrysler 300M model year
| Year | Programming | Key fob | Battery |
|---|---|---|---|
| 2004 | — | CR2032 battery on Amazon | |
| 2003 | — | CR2032 battery on Amazon | |
| 2002 | — | CR2032 battery on Amazon | |
| 2001 | — | CR2032 battery on Amazon | |
| 2000 |
| — | CR2032 battery on Amazon |
| 1999 |
| — | CR2032 battery on Amazon |
2001–2004 Chrysler 300M
Remote / key fob programming
On these Dodge, Chrysler, and Jeep vehicles you can reprogram remotes yourself if you already have one working remote. Try Procedure 1 first; if it doesn't work, use Procedure 2. Every remote not reprogrammed now will stop working.
Full steps: Dodge and Chrysler Remote Programming With a Working Remote
Key programming
On these Chrysler, Dodge, and Jeep vehicles you can add a new key yourself if you already have two working keys. Vehicles from 2010 and newer must be done by an automotive locksmith or dealer.
Full steps: Chrysler and Dodge Add a Key With Two Working Keys
1999–2000 Chrysler 300M
Remote / key fob programming
This remote can't be programmed with a do-it-yourself procedure. The vehicle needs a diagnostic tool connected to its OBD port to pair a new remote, so a replacement has to be set up by an automotive locksmith or a dealer.
Order the correct replacement remote below — match the FCC ID on your current fob first — then have a local automotive locksmith or the dealer program it to your vehicle.
Key programming
On these Chrysler, Dodge, and Jeep vehicles you can add a new key yourself if you already have two working keys. Vehicles from 2010 and newer must be done by an automotive locksmith or dealer.
Full steps: Chrysler and Dodge Add a Key With Two Working Keys
Chrysler 300M key fob battery
Most 300M fobs use a CR2032 3V lithium coin cell. A fresh one typically lasts 3–5 years.
Buy Energizer CR2032 Lithium Coin Batteries (4-pack) on AmazonHow to replace the battery
- 1 Find the seam or small slot on the edge of the fob.
- 2 Twist a coin or small flathead screwdriver in the slot to split the case open.
- 3 Lift out the old coin cell and note which side faces up.
- 4 Fit the new battery the same way (printed + side usually faces the cover), then close the case until it clicks.
- 5 Press a button or test lock/unlock at the car to confirm it works.
Battery tips
- Use a fresh, name-brand 3V lithium cell — bargain cells drain quickly.
- Try not to touch both faces of the new battery with your fingers; skin oils shorten its life.
- If the buttons still don't respond after a new battery, the fob may need re-syncing or programming.
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