OBD2 code U0001: High Speed CAN Communication Bus
A general fault on the high-speed CAN bus has been detected.
Detected Root Component
Network Component
Observed Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Possible Causes
- CAN-High and CAN-Low shorted together
- Open circut in CAN bus wiring
- Terminating resistor failed (not 60 ohms across bus)
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Moteur (général))
Moteur (général)
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Frequently asked questions about code U0001
What does code U0001 mean? ▾
OBD2 code U0001: High Speed CAN Communication Bus. A general fault on the high-speed CAN bus has been detected.
What are the symptoms of code U0001? ▾
Code U0001 may cause: Multiple warning lights may illuminate, Affected modules may go into limp mode or shut down, Specific functions inoperative depending on module, Diagnostic tools may show communication faults. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code U0001? ▾
The most common causes of code U0001 are: CAN-High and CAN-Low shorted together, Open circuit in CAN bus wiring, Terminating resistor failed (not 60 ohms across bus). A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code U0001? ▾
Yes, code U0001 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code U0001? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: CAN-High and CAN-Low shorted together, Open circuit in CAN bus wiring, Terminating resistor failed (not 60 ohms across bus). Difficulty: Medium · Estimated time: 30-60min.