Security researchers have repeatedly demonstrated that a cheap software-defined radio can spoof TPMS sensor IDs and inject forged low-pressure warnings from meters away. This article examines the software countermeasures that make such attacks impractical on modern vehicle platforms.
A basic spoofing attack requires only capturing a legitimate sensor's 32-bit ID once, then transmitting arbitrary pressure values under that identity. Without cryptographic binding, the receiver ECU has no way to distinguish the forged packet from a genuine transmission, allowing an attacker to trigger persistent dashboard warnings or, in more serious cases, feed implausible data into stability control logic.
Modern gateway software rejects any packet whose rolling counter value is not strictly greater than the last accepted value for that sensor ID, and verifies a lightweight message authentication code computed with a key provisioned during pairing. Combined with RSSI-based relay detection, this reduces the practical attack surface from a trivial radio replay to a resource-intensive key-extraction attempt requiring physical access to the sensor.