OBD-II code U0092 indicates a loss of communication between the engine control module (PCM) and one or more modules on the 'H' vehicle communication bus, typically a high-speed CAN (Controller Area Network) bus. This means the PCM cannot exchange data with a specific module, which may affect multiple vehicle systems.
A module such as the ABS, transmission control, or body control module has failed internally or lost power/ground, causing it to stop communicating.
Open circuits, shorts to ground or power, or corrosion in the twisted-pair wiring or connectors disrupt the data signal.
A loose or corroded ground at a module or at a bus termination point can cause intermittent or complete communication loss.
Insufficient voltage from a failing battery or charging system can cause modules to drop offline or behave erratically.
Improperly installed accessories (e.g., remote starters, alarms, radios) can inject noise or physically damage the bus wiring.
The engine control module itself may have an internal communication fault, but this is the least likely cause and should only be considered after all other possibilities are ruled out.
It is not recommended, as critical systems like ABS, transmission, or stability control may be inoperative, increasing the risk of an accident.
Almost never. The PCM is rarely the cause; replacing it without thorough diagnosis of the bus and other modules is a common misdiagnosis that wastes time and money.
Yes, a weak battery or charging system fault can cause modules to drop communication intermittently, triggering this code. Always check battery health first.
The 'H' designates a specific communication bus, typically the high-speed CAN bus used for powertrain and chassis systems. The exact bus varies by manufacturer.