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TuningBot DTC Database · v4.37.15

U0008 Controller area network (CAN) data bus: high speed bus( - ) - voltage high

Generic (OBD-II) interpretation in the TuningBot DTC database.

U · NetworkNetworkOBD2

What U0008 means

U0008
Controller area network (CAN) data bus: high speed bus( - ) - voltage high Generic · network Data confidence 65%

The control module detected that the Controller area network (CAN) data bus: high speed bus( - ) voltage stayed above the expected range.

Symptoms

  • Multiple systems may log communication codes
  • Possible loss of gauge or system functions

Possible causes

  • Bus wiring open or short circuit
  • Terminating resistor fault
  • A faulty node disturbing the bus
  • Connector corrosion

Recommended checks

  • Measure CAN-H/CAN-L voltages and bus resistance
  • Map communicating vs silent modules with a full scan
  • Inspect harness sections prone to chafing
  • Check for water ingress at connectors

Related and nearby codes

U00 range
U0001U0002U0003U0004U0005U0006U0007U0009U0010U0011U0012U0013U0014U0015U0016U0017U0018U0019

How to read U0008

U

Network: communication between control units.

0

Generic SAE-standard code: same meaning on every make.

008

Specific fault index within the subsystem.

Frequently asked questions about U0008

What does U0008 mean?

Controller area network (CAN) data bus: high speed bus( - ) - voltage high. The control module detected that the Controller area network (CAN) data bus: high speed bus( - ) voltage stayed above the expected range.

Is U0008 generic or manufacturer-specific?

U0008 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0008 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0008 is removable in your case.

Other file services

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