System: Network · Standard: SAE J2012 generic code · Severity: Do not keep driving
This fault can damage expensive hardware within a short distance. Stop and diagnose before driving further.
If the engine controller itself is silent, the vehicle usually will not start. Check its power and ground first.
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 engine control module. Lost Communication With ECM/PCM A is a generic network code defined by SAE J2012, so it carries the same meaning on every OBD-II vehicle.
Do not keep driving. This fault can damage expensive hardware within a short distance. Stop and diagnose before driving further.
In rough order of how often they turn out to be the problem: CAN bus wiring fault; Failed engine controller; Blown fuse for the controller.
U0001 High Speed CAN Communication BusU0101 Lost Communication With Transmission Control ModuleU0121 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.