Network
generic / SAE
U0012
Medium Speed CAN Communication Bus (-) Open
The CAN-Low wire on the medium-speed comfort/body bus is open. Body modules such as door modules, climate control or seat modules lose communication, but powertrain functions usually stay alive.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 12
Possible causes
- CAN-Low wire broken in body harness high
- Loose body control module connector medium
- Gateway module routing CAN messages incorrectly low
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
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 60–500 €
- Estimated time: 0.8–4 h
- Component: can low wire
- Component: body control module
- MIL / check engine light
Sources
References
sae:J2012
iso:11898