U0243
Lost Communication with Trailer Hitch Module
2001-2005 BMW 325i E46 2.5L I6 🇷🇺
Low SeverityNetwork
Description
Cannot communicate with the integrated trailer hitch control module.
Symptoms
- Trailer lights not working
- Trailer brake output disabled
- Tow/haul mode limited
- Trailer sway control disabled
Common Causes
- Hitch module failure
- CAN bus wiring
- Module power loss
- Fuse blown
- Trailer connector corrosion
Diagnostic Steps
- Check hitch module fuse
- Test power and ground
- Check CAN wiring
- Inspect trailer connector
- Test trailer light outputs
Repair Notes
Check fuses and trailer connector. Corrosion at trailer plug is the most common cause.
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
U0243 on Other Vehicles
Common Questions
What does code U0243 mean on a 2001-2005 BMW 325i E46?
U0243 stands for "Lost Communication with Trailer Hitch Module". Cannot communicate with the integrated trailer hitch control module.
What are the symptoms of U0243 on a BMW 325i E46?
Common symptoms of U0243 include: Trailer lights not working, Trailer brake output disabled, Tow/haul mode limited, Trailer sway control disabled.
What causes U0243 on a 2001-2005 BMW 325i E46?
Common causes of U0243 include: Hitch module failure, CAN bus wiring, Module power loss, Fuse blown, Trailer connector corrosion.