Code result
U0032
Vehicle Communication Bus A (+) High
High severity
What it means
The communication bus A high-side line (CAN-H or equivalent) is at a higher voltage than allowed. Likely short to power or a transceiver fault that pulls the line high.
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
Bus high line shorted to battery
highOne of the most commonly reported causes for this code — check this first.
Transceiver in one node failed
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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