U0009critical severityNetwork
High Speed CAN Communication Bus Shorted Together
on 2015 Volkswagen e-Golf Electric · FWD
What this code means
CAN H and CAN L wires are shorted to each other, preventing differential signaling on the bus.
Symptoms
- Complete CAN bus failure
- No communication with any module on bus
- Vehicle may not start
Common causes
- CAN H and CAN L wires shorted together
- Connector pin damage
- Crushed wiring harness
- Rodent damage to wiring
Diagnostic steps
- Measure resistance between CAN H and CAN L (should be ~60 ohms with termination)
- Inspect wiring for physical damage
- Check connectors for bent pins
- Disconnect modules and measure resistance at each segment
Repair notes
Locate the short between CAN H and CAN L. Common in door jambs and under-dash wiring.
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U0001
High Speed CAN Communication Bus