U0147: Lost Communication With Gateway B
HighNetwork/CommunicationCommunication Bus
What does U0147 mean?
U0147 is a diagnostic trouble code indicating "Lost Communication With Gateway B". The vehicle's main computer has lost its ability to communicate with a specific module over the data bus. This could be caused by a wiring fault, a blown fuse, or a failed control module.
Symptoms you may notice
- Check engine light (MIL) illuminated on dashboard
- Noticeable change in engine performance
- Unusual sounds or vibrations
- Possible issues with communication bus operation
- Vehicle may enter reduced power mode (limp mode)
Estimated repair cost
Typical range in Australia (parts + labour)
$200 – $1500 AUD
Common causes
- Failed control module
- CAN bus wiring fault or short
- Blown fuse to the affected module
- Water intrusion in a connector or module
- Battery voltage too low
What should you do?
This code is a fault on the vehicle data network itself rather than in one named module. Anything on that bus can be affected, safety systems included, and the code alone does not tell you which. Have the network scanned properly rather than assuming it is minor.
Get a diagnosis for YOUR car
Code U0147 can mean different things depending on your vehicle. TorqueBot gives you a diagnosis specific to your make, model, and year.