U3033 — Control Module Security Certificate Missing/Invalid

What Does U3033 Mean?

U3033 is a diagnostic trouble code indicating: Control Module Security Certificate Missing/Invalid. This code relates to the vehicle systems system. The vehicle's computer detected a condition outside normal operating parameters and stored this code.

What To Do Next

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

Related Codes

U3028 Control Module A Disable Feedback Circuit U3029 Control Module A Disable Feedback Circuit Low U3030 Ignition Output Start U3031 Ignition Output Off U3032 Ignition Output Accessory/Off U3034 Communication Authentication Key/Certificate Missing/Invalid U3035 Communication Authentication Signal Invalid Data U3036 Communication Authentication Signal Performance