U0203low severityNetwork
Lost Communication with Trunk/Liftgate Module
on 2021 Audi A6 3.0L Turbo V6 · AWD
What this code means
Cannot communicate with the power trunk lid or liftgate control module.
Symptoms
- Power liftgate not opening
- Trunk release not working
- Liftgate position unknown
- Hands-free liftgate disabled
Common causes
- Liftgate module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Liftgate strut motor failure
Diagnostic steps
- Check liftgate module fuse
- Test power and ground
- Check CAN wiring
- Test liftgate motor
- Check liftgate latch sensor
Repair notes
Check fuses. Wiring at liftgate hinge flexes and commonly breaks.
Other Network codes on this vehicle
U0001
High Speed CAN Communication Bus
U0002
High Speed CAN Communication Bus Performance
U0003
High Speed CAN Communication Bus (+) Open
U0004
High Speed CAN Communication Bus (+) Low
U0005
High Speed CAN Communication Bus (+) High
U0006
High Speed CAN Communication Bus (-) Open
U0007
High Speed CAN Communication Bus (-) Low
U0008
High Speed CAN Communication Bus (-) High
U0009
High Speed CAN Communication Bus Shorted Together
U0010
Medium Speed CAN Communication Bus