OBD-II code · Network
U0006 High Speed CAN Communication Bus (-) Open
The CAN-Low wire of the high-speed bus is open. The differential signal can no longer be evaluated correctly, so all bus participants report communication loss simultaneously.
Is it safe to drive with U0006?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCAN-Low wire broken
- PossiblePin pushed back in connector
- Less likelyGateway module routing CAN messages incorrectly
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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Usually unaffected
- Parts involved
- Can Low Wire, Module Connector
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.