OBD-II code · Network (extended)
U3033 Control Module Security Certificate Missing/Invalid
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 with U3033?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyCertificate not provisioned in module
- PossibleCertificate expired or revoked
- Less likelyGateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Control Module, Security Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.