U0203
Lost Communication with Trunk/Liftgate Module
2014-2021 Mazda Mazda6 2.5L I4
Low SeverityNetworkGeneric (SAE)
Description
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.
Related Codes
Other Network Codes
- U0001High Speed CAN Communication Bus
- U0002High Speed CAN Communication Bus Performance
- U0003High Speed CAN Communication Bus (+) Open
- U0004High Speed CAN Communication Bus (+) Low
- U0005High Speed CAN Communication Bus (+) High
- U0006High Speed CAN Communication Bus (-) Open
- U0007High Speed CAN Communication Bus (-) Low
- U0008High Speed CAN Communication Bus (-) High
- U0009High Speed CAN Communication Bus Shorted Together
- U0010Medium Speed CAN Communication Bus
U0203 on Other Vehicles
Common Questions
What does code U0203 mean on a 2014-2021 Mazda Mazda6?
U0203 stands for "Lost Communication with Trunk/Liftgate Module". Cannot communicate with the power trunk lid or liftgate control module.
What are the symptoms of U0203 on a Mazda Mazda6?
Common symptoms of U0203 include: Power liftgate not opening, Trunk release not working, Liftgate position unknown, Hands-free liftgate disabled.
What causes U0203 on a 2014-2021 Mazda Mazda6?
Common causes of U0203 include: Liftgate module failure, CAN bus wiring, Module power loss, Fuse blown, Liftgate strut motor failure.