B2799 –Toyota: “Engine Immobilizer System Malfunction”
OBD II fault code B2799 is a manufacturer specific code that is defined by carmaker Toyota as “Engine Immobilizer System Malfunction”, and is set when the PCM (Powertrain Control Module) detects either a communication error between itself and the transponder key, or a malfunction in one or more communication lines between itself, the transponder key, and the immobilizer control module. Note that this code can also be set when one or more implicated control modules detect incorrect security codes being transmitted from the key to the PCM or immobilizer control module.
After immobiliser reset, there is no need to syncronise the PCM to immobiliser, as it is not affected by the reset.