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Home/DTC Codes/Citroën/C4/2020-2024 Electric/U0008
U0008

High Speed CAN Communication Bus (-) High

2020-2024 Citroën C4 Electric 🇩🇪

High SeverityNetwork

Description

The CAN Low wire voltage is higher than expected, indicating a short to power.

Symptoms

  • CAN bus failure
  • Multiple communication errors
  • Systems unresponsive

Common Causes

  • CAN L shorted to battery voltage
  • Wiring harness damage
  • Module fault driving CAN L high

Diagnostic Steps

  1. Measure CAN L voltage
  2. Disconnect modules to isolate
  3. Inspect wiring for shorts to power circuits
  4. Check harness routing near power wires

Repair Notes

Repair CAN L short to power. Ensure CAN wiring is properly separated from power wiring.

Related Codes

U0001High Speed CAN Communication BusU0006High Speed CAN Communication Bus (-) OpenU0007High Speed CAN Communication Bus (-) Low

Other Network Codes

U0008 on Other Vehicles

Citroën Ami

2020-2025 Electric 5.5kWh

Citroën Berlingo

2018-2024 1.2L I3 PureTech

Citroën Berlingo

2018-2024 1.5L I4 BlueHDi

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 U0008 mean on a 2020-2024 Citroën C4?

U0008 stands for "High Speed CAN Communication Bus (-) High". The CAN Low wire voltage is higher than expected, indicating a short to power.

What are the symptoms of U0008 on a Citroën C4?

Common symptoms of U0008 include: CAN bus failure, Multiple communication errors, Systems unresponsive.

What causes U0008 on a 2020-2024 Citroën C4?

Common causes of U0008 include: CAN L shorted to battery voltage, Wiring harness damage, Module fault driving CAN L high.

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