U0072
Vehicle Communication Bus A (-) Bus Off
The CAN controller for bus A has gone bus-off on the minus side. Common after a CAN-L short or a faulty transceiver pulling the bus low.
The CAN controller for bus A has gone bus-off on the minus side. Common after a CAN-L short or a faulty transceiver pulling the bus low.
Common causes
- high
Persistent short on CAN-L wire
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-880
- low
Gateway module routing CAN messages incorrectly
Less common, but worth ruling out after the more likely causes.
Typical part cost: $90-880
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First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
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Related codes
See related trouble codes
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Frequently asked questions
What does U0072 mean?
U0072 means "Vehicle Communication Bus A (-) Bus Off". It is a generic OBD-II code that points to a fault in the network / communication.
What are the most common causes of U0072?
persistent short on can-l wire; gateway module routing can messages incorrectly; can terminating resistor (120 ω) drifted out of spec — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly. Use the Wrenchify app for a full diagnosis specific to your vehicle.
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