Vehicle Communication Bus B Performance
2021-2024 Dacia Spring Electric 🇩🇪
Description
CAN bus B performance is degraded with intermittent communication issues.
Symptoms
- Secondary systems intermittent
- Body control functions erratic
- Climate control glitches
Common Causes
- Wiring degradation on bus B
- Module fault on bus B
- Poor splice connections
- Aftermarket device loading bus
Diagnostic Steps
- Scope bus B signals
- Check bus B termination
- Inspect bus B wiring
- Isolate modules on bus B
Repair Notes
Diagnose bus B wiring and termination. Check for aftermarket device interference.
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
U0029 on Other Vehicles
Dacia Bigster
2025-2025 1.2L I3 Turbo TCe 130
Dacia Bigster
2025-2025 1.6L I4 Hybrid 155
Dacia Duster
2017-2024 1.0L I3 TCe
Dacia Duster
2017-2024 1.3L I4 TCe
Dacia Duster
2017-2024 1.5L I4 dCi
Dacia Duster
2024-2025 1.0L I3 TCe 100 LPG
Dacia Duster
2024-2025 1.2L I3 Hybrid TCe 130
Dacia Duster PL
2018-2025 1.0L I3 Turbo TCe 100
Common Questions
What does code U0029 mean on a 2021-2024 Dacia Spring?
U0029 stands for "Vehicle Communication Bus B Performance". CAN bus B performance is degraded with intermittent communication issues.
What are the symptoms of U0029 on a Dacia Spring?
Common symptoms of U0029 include: Secondary systems intermittent, Body control functions erratic, Climate control glitches.
What causes U0029 on a 2021-2024 Dacia Spring?
Common causes of U0029 include: Wiring degradation on bus B, Module fault on bus B, Poor splice connections, Aftermarket device loading bus.