#communication
5 posts in Car Diagnostics blog about "communication" — OBD-II diagnostics, DTC codes, repair. ← All posts
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U0073: control module communication bus off — the whole network went quiet
This is not one module failing to answer. It is the network itself shutting down, and the cause is usually one device dragging everything else with it.
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U0109: lost communication with the fuel pump control module
The module that varies pump speed has stopped answering. The car may not start, and the cause is often a connector under the rear of the vehicle.
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U0151: lost communication with the restraints control module
The airbag module has stopped answering, which means nothing can confirm the restraint system will work. That makes this a code with a deadline.
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U0401: invalid data received from ECM — a message that arrived and made no sense
Not a lost connection. The message arrived intact and its contents were implausible, which points somewhere different from a wiring fault.
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U0101: lost communication with the transmission control module
U0101 means the engine ECU stopped hearing the gearbox module on the CAN bus. The module is often alive and well — it is the wiring, power or bus termination that failed.