Code result
U0016
Medium Speed CAN Communication Bus Off
High severity
What it means
A controller on the medium-speed comfort bus has shut its transceiver off after too many consecutive transmit errors. Comfort and body functions stop responding until the bus recovers or is repaired.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Wiring short forces bus-off state
highOne of the most commonly reported causes for this code — check this first.
One failing node corrupts traffic
mediumA plausible cause — test and verify before replacing parts.
Gateway module routing CAN messages incorrectly
lowLess common, but worth ruling out after the more likely causes.
Related help
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