Code result
U0007
High Speed CAN Communication Bus Low
High severity
What it means
The CAN-Low line is shorted to ground or held below its valid recessive level. The differential pair cannot transmit data and the bus is effectively dead.
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
CAN-Low shorted to ground
highOne of the most commonly reported causes for this code — check this first.
Failed transceiver on one module
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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