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Home/DTC Codes/Citroën/C4/2020-2024 Electric/U0029
U0029

Vehicle Communication Bus B Performance

2020-2024 Citroën C4 Electric 🇩🇪

Moderate SeverityNetwork

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

  1. Scope bus B signals
  2. Check bus B termination
  3. Inspect bus B wiring
  4. Isolate modules on bus B

Repair Notes

Diagnose bus B wiring and termination. Check for aftermarket device interference.

Related Codes

U0010Medium Speed CAN Communication BusU0028Vehicle Communication Bus A Performance

Other Network Codes

U0029 on Other Vehicles

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2020-2025 Electric 5.5kWh

Citroën Berlingo

2018-2024 1.2L I3 PureTech

Citroën Berlingo

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Citroën Berlingo

2018-2025 1.2L I3 Turbo PureTech 110

Citroën Berlingo

2018-2025 1.5L I4 Diesel BlueHDi 100

Citroën Berlingo

2021-2025 Electric e-Berlingo 50kWh

Citroën Berlingo III FR

2018-2025 1.2L I3 Turbo PureTech 110

Citroën Berlingo III FR

2018-2025 1.5L I4 Diesel BlueHDi 100

Common Questions

What does code U0029 mean on a 2020-2024 Citroën C4?

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 Citroën C4?

Common symptoms of U0029 include: Secondary systems intermittent, Body control functions erratic, Climate control glitches.

What causes U0029 on a 2020-2024 Citroën C4?

Common causes of U0029 include: Wiring degradation on bus B, Module fault on bus B, Poor splice connections, Aftermarket device loading bus.

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