OBD-II Code · Network
U0076
Control Module Communication Bus B Off
high severityDo not drive$100-$2,000
Bus B offline.
Common symptoms
- Warning lights
Likely causes
- Short
- Failed module
Where to start
- Try the cheapest cause first. Start by checking: short.
- Cost & scope. $100-$2,000
- If the code returns after the fix: escalate to a shop or scanner with live-data and freeze-frame. A code that re-sets means the underlying fault is still there. Don't keep driving with this one active — risk of damage.
Related codes
P0600Serial Communication LinkU0001High Speed CAN Communication BusU0002High Speed CAN Communication Bus PerformanceU0010Medium Speed CAN Communication BusU0073Control Module Communication Bus A OffU0100Lost Communication with ECM/PCMU0101Lost Communication with TCMU0109Lost Communication with Fuel Pump Control Module
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