U0046high severityNetwork
Vehicle Communication Bus B Off
on 2013 Audi A6 3.0L Supercharged V6 · AWD
What this code means
CAN bus B is completely offline. No communication on the secondary CAN bus.
Symptoms
- Secondary systems inoperative
- Body control functions down
- Climate control offline
- Entertainment system not communicating
Common causes
- CAN bus B wiring shorted or open
- Bus B termination resistor failure
- Module pulling down bus B
- Major connector failure
Diagnostic steps
- Measure bus B resistance
- Check bus B voltage levels
- Isolate bus B segments
- Inspect bus B connectors
Repair notes
Complete bus B failure requires systematic wiring diagnosis.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0005
High Speed CAN Communication Bus (+) High