U0038
LIN Bus A (+) Open
2019-2024 BMW 3 Series G20 2.0L I4 Turbo B48
Low SeverityNetworkGeneric (SAE)
Description
The LIN bus A wire is open, preventing communication with LIN slave devices.
Symptoms
- LIN-connected devices inoperative
- Seat memory not working
- Rain sensor offline
- Interior lighting module offline
Common Causes
- Broken LIN bus wire
- Corroded LIN connector
- LIN module unplugged
- Wiring harness damage
Diagnostic Steps
- Check LIN bus wire continuity
- Inspect connectors
- Test for 12V pullup on LIN bus
- Check LIN master output
Repair Notes
Repair open LIN bus wire. Check connectors at all LIN slave devices.
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
U0038 on Other Vehicles
Common Questions
What does code U0038 mean on a 2019-2024 BMW 3 Series G20?
U0038 stands for "LIN Bus A (+) Open". The LIN bus A wire is open, preventing communication with LIN slave devices.
What are the symptoms of U0038 on a BMW 3 Series G20?
Common symptoms of U0038 include: LIN-connected devices inoperative, Seat memory not working, Rain sensor offline, Interior lighting module offline.
What causes U0038 on a 2019-2024 BMW 3 Series G20?
Common causes of U0038 include: Broken LIN bus wire, Corroded LIN connector, LIN module unplugged, Wiring harness damage.