Network
generic / SAE
U0003
High Speed CAN Communication Bus (+) Open
The CAN-High line of the high-speed bus is open. Without the differential pair, the controller cannot decode any traffic and reports loss of all participating modules at once. Often follows a wiring repair, accident damage, or a corroded connector pin.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 03
Possible causes
- CAN-High wire broken or pin pushed back high
- Corroded module connector medium
- Harness damage after repair or accident medium
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: 80–800 €
- Estimated time: 1–6 h
- Component: can high wire
- Component: module connector
- Component: can transceiver
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012
iso:11898