U0140
Lost Communication with Body Control Module
1997-2003 Audi A8 4.2L V8
High SeverityNetworkGeneric (SAE)
Description
Cannot communicate with the BCM.
Symptoms
- Multiple electrical features inoperative
- Lighting issues
- Lock/unlock not working
- Warning lights on
Common Causes
- BCM power failure
- CAN bus issue
- BCM failure
- Water damage
Diagnostic Steps
- Check BCM fuses
- Test power and ground
- Check CAN wiring
- Inspect for water damage
Repair Notes
Check for water intrusion (common BCM failure cause). Check fuses.
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
U0140 on Other Vehicles
Common Questions
What does code U0140 mean on a 1997-2003 Audi A8?
U0140 stands for "Lost Communication with Body Control Module". Cannot communicate with the BCM.
What are the symptoms of U0140 on a Audi A8?
Common symptoms of U0140 include: Multiple electrical features inoperative, Lighting issues, Lock/unlock not working, Warning lights on.
What causes U0140 on a 1997-2003 Audi A8?
Common causes of U0140 include: BCM power failure, CAN bus issue, BCM failure, Water damage.