Yes, thieves can and do steal car remote codes using increasingly sophisticated methods. The days of simply "catching" a code as you lock your car are mostly over, but modern thieves use devices that intercept, amplify, or block the radio frequency (RF) signals between your key fob and your car. The most common techniques are RFID signal relaying, where thieves use one device near your front door to amplify your key fob's signal to a second device near your car, tricking the car into thinking the key is present. Another method is signal jamming, where a device blocks the lock signal, leaving your car vulnerable.
The vulnerability often depends on the type of key fob system. Older rolling code systems, which change the code with each use, can still be vulnerable to more advanced attacks where a thief intercepts the code and jams the signal, preventing the code from updating. Newer passive keyless entry and start systems (PKES), common in many modern vehicles, are particularly susceptible to the relay attack.
| Theft Method | Target Vehicle Type | Required Equipment | Range | Effectiveness (Prevention Difficulty) |
|---|
| Code Grabbing (Old Method) | Older models with fixed codes | Basic radio receiver | Short (a few feet) | Low (Obsolete) |
| Signal Replay | Older rolling code systems | Two portable transceivers | Up to 300 feet | Moderate (Defeated by newer tech) |
| Signal Jamming | All types during locking | Small, cheap jammer | 15-30 feet | High (Simple, effective) |
| RFID Relay Attack | Modern PKES vehicles | Two sophisticated devices | Up to 100+ feet | Very High (Major current threat) |
| Rolling Code Prediction | Flawed rolling code systems | Advanced software/hardware | Varies | Low (Rare, manufacturer-specific flaw) |
To protect yourself, store your key fob in a Faraday bag or pouch (a signal-blocking pouch) when at home, especially overnight. Avoid leaving your key fob near the front door or in a bowl by the garage. For an extra layer of security, use a traditional, physical steering wheel lock; it's a highly visual deterrent that makes your car a less appealing target. Always manually check that your car is locked by pulling the door handle after using the remote.
