THE MOST COMMON ERRORS: 9359 - No ACC signal. The most common option is an alarm with autostart. It is also possible that the 3A AUDIO fuse has blown. C100 - Lost communication with the engine controller (in our case, the PCM), most often the cause is either poor contact in the connectors or incorrect installation of the car alarm. The error may also appear due to a deep discharge of the battery (will be accompanied by error 9318). C101 - Lost communication with the transmission controller (TCM). Of the known cases of problems, so far there have been only failures in the PCM (DTC C100). However, this does not negate a possible failure in the automatic or robotic gearbox. C140 - Lost communication with the body controller (in our case, the GEM unit). Most likely, the battery is discharged (accompanied by error 9318), but it is also possible due to poor installation of the car alarm. C100 and C140 - occur due to connection of third-party devices to the digital bus, such as external on-board computers, diagnostic modules, if these devices have violations in the CAN interface units. C121 - Data from the ABS unit was not transmitted via CAN. Possible ABS unit failure, low battery voltage, or blown ABS module fuse. E197 - No speed data - this is a consequence of error C121, but on cars without ABS, this error indicates a speed sensor failure. E200 - Incorrect mileage data - this is a consequence of error E197, since the instrument cluster cannot receive speed data and therefore cannot calculate the mileage. 9318 - a drop in battery voltage below 10 volts was registered. As a rule, the car did not start, the instrument cluster was barely lit before that. That is, if this phenomenon was observed, then the error can be ignored. A103 - the immobilizer antenna is not connected. A rare error. It is possible that the alarm system was installed by crooked hands, or the green connector in the left threshold is a bad contact or the connector is not closed. A286 - the on-board computer button is shorted to ground (I think this error cannot be seen in the self-diagnostic mode, because it is simply impossible to get into this mode).