U0203
NetworkModule Communicationlow severityLost Communication with Trunk/Liftgate Module
What U0203 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
Where to start: Check fuses. Wiring at liftgate hinge flexes and commonly breaks.
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