OBD2 code U0005: High Speed CAN Communication Bus (+) High
The CAN-High line is held above its valid voltage range, usually because of a short to battery voltage.
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 shorted to battery voltage
- Chafed harness against power wire
- Gateway module routing CAN messages incorrectly
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Moteur (général))
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Frequently asked questions about code U0005
What does code U0005 mean? ▾
OBD2 code U0005: High Speed CAN Communication Bus (+) High. The CAN-High line is held above its valid voltage range, usually because of a short to battery voltage.
What are the symptoms of code U0005? ▾
Code U0005 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 U0005? ▾
The most common causes of code U0005 are: CAN-High shorted to battery voltage, Chafed harness against power wire, Gateway module routing CAN messages incorrectly. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code U0005? ▾
Yes, code U0005 is critical (Critical). Avoid driving and consult a professional promptly to prevent major damage.
How do I fix code U0005? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: CAN-High shorted to battery voltage, Chafed harness against power wire, Gateway module routing CAN messages incorrectly. Difficulty: Medium · Estimated time: 30-60min.