System: Network · Standard: SAE J2012 generic code · Severity: Repair soon
The car will usually keep running, but continued driving risks secondary damage or an emissions failure. Book the repair.
Losing the transmission module usually forces a fixed-gear limp mode so the car stays driveable.
Start by reading every stored and pending code, not just this one. A single fault frequently sets three or four codes at once, and the first one in the freeze-frame data is usually the cause while the rest are consequences.
A module has lost communication with the transmission controller. Lost Communication With Transmission Control Module is a generic network code defined by SAE J2012, so it carries the same meaning on every OBD-II vehicle.
Repair soon. The car will usually keep running, but continued driving risks secondary damage or an emissions failure. Book the repair.
In rough order of how often they turn out to be the problem: CAN wiring fault; Failed transmission controller; Blown fuse.
U0001 High Speed CAN Communication BusU0100 Lost Communication With ECM/PCM AU0121 Lost Communication With ABS Control ModuleU0140 Lost Communication With Body Control ModuleU0155 Lost Communication With Instrument Panel ClusterCode number, system and definition follow the SAE J2012 / ISO 15031-6 generic diagnostic trouble code standard. Symptoms, causes and severity are the standard generic diagnostic logic for that fault. This page does not contain manufacturer-specific procedures, part numbers or pricing.