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Code

U0073

Network

Control module communication bus off

Communication on the bus is completely stopped.

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Most likely causes

CAN bus wiring fault
Failed module holding the bus
Low voltage

Symptoms you may notice

Many lights on
Systems disabled

Checks to run

Check battery voltage
Measure CAN bus continuity
Isolate modules

Tools you may need

Multimeter Oscilloscope

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

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