Code result
U3033
Control Module Security Certificate Missing/Invalid
High severity
What it means
The control module's security certificate (used for authenticated communication, secure boot or vehicle anti-tamper) is missing or fails validation.
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
Certificate not provisioned in module
highOne of the most commonly reported causes for this code — check this first.
Certificate expired or revoked
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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