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.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
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
Common causes
Ordered by how often each turns out to be the cause.
- Certificate not provisioned in moduleCommon
- Certificate expired or revokedPossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Control Module
- Security Module
U3033 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.