Network
generic / SAE
U0001
High Speed CAN Communication Bus
A general fault on the high-speed CAN bus has been detected. This bus typically connects powertrain modules (ECM, TCM, ABS) at 500 kbit/s and a fault disables communication between them, often triggering multiple secondary DTCs in other modules.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number– / 01
Possible causes
- CAN-High and CAN-Low shorted together high
- Open circuit in CAN bus wiring high
- Terminating resistor failed (not 60 ohms across bus) 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: 80–1500 €
- Estimated time: 1–8 h
- Component: can bus wiring
- Component: can terminating resistor
- Component: control module
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012
iso:11898