U0108
Lost Communication with Exhaust Gas Recirculation Module
1997-2003 Audi A8 4.2L V8
Moderate SeverityNetworkGeneric (SAE)
Description
Cannot communicate with the EGR system control module.
Symptoms
- Check Engine Light
- Increased NOx emissions
- EGR-related DTCs
- Poor fuel economy
- Rough idle
Common Causes
- EGR module failure
- CAN bus wiring issue
- Fuse blown
- Connector corrosion
- Carbon buildup causing module damage
Diagnostic Steps
- Check EGR module fuse
- Test power and ground
- Inspect CAN wiring
- Check connector condition
- Test EGR module directly
Repair Notes
Check fuses and wiring. EGR modules on diesels are prone to carbon contamination.
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
U0108 on Other Vehicles
Common Questions
What does code U0108 mean on a 1997-2003 Audi A8?
U0108 stands for "Lost Communication with Exhaust Gas Recirculation Module". Cannot communicate with the EGR system control module.
What are the symptoms of U0108 on a Audi A8?
Common symptoms of U0108 include: Check Engine Light, Increased NOx emissions, EGR-related DTCs, Poor fuel economy, Rough idle.
What causes U0108 on a 1997-2003 Audi A8?
Common causes of U0108 include: EGR module failure, CAN bus wiring issue, Fuse blown, Connector corrosion, Carbon buildup causing module damage.