U0146: Lost Communication With Gateway "A"
Another module has stopped receiving messages from the network gateway.
Normal risk
Have it checked soon. Several functions may be affected.
Short answer · Can I keep driving with U0146?
Depends on which functions are lost. Check the battery and have it diagnosed.
What does U0146 mean?
U0146 is stored when modules stop receiving messages from gateway A, the module that links different networks in the car.
What the car does when the code is set
Functions of the affected module may stop working or behave strangely, for example lights, locks, climate control, displays or the radio.
How the system works
Body functions such as lights, locks, displays, climate control and audio are handled by modules on the body network. A gateway often links this network to others. Missing messages from one module are stored as lost communication codes in the others.
Common symptoms
Possible causes
Listed without ranking. The cause on your car depends on make, engine and mileage — see the maker notes below.
- Power or ground fault at the moduleA blown fuse or poor ground.
- Network wiring faultDamaged or corroded wires and connectors.
- Low battery voltageCommon after the car has stood for a long time.
- Aftermarket equipmentAccessories connected to the body network can disturb it.
- Failed modulePossible, but check the basics first.
How it is diagnosed
- Check which functions do not workLights, locks, dashboard displays or climate control point to the module concerned.
- Check fuses and battery voltageUse the fuse diagram for the module.
- Look for water entryWet carpets, door seals and sunroof drains often explain corroded body modules.
- Scan all modulesA workshop checks whether the module responds and tests the network.
Questions about U0146
What does a gateway do?
It passes messages between networks, for example between the powertrain and body networks.
Is a body network code dangerous?
Usually not for driving, unless lights, wipers or other safety functions stop working.