What does code U3035 mean?

Q: What does code U3035 mean?

Communication Authentication Signal Invalid Data. U3035 means a control module received a message whose authentication signature or checksum did not match the expected value, so the data was rejected as invalid. The computer detected a communication frame that failed its integrity or security check, which is different from a missing message or a lost bus connection.

DTC codes / U30xx · Network wiring and bus faults / U3035

U3035Communication Authentication Signal Invalid Data

U3035 means a control module received a message whose authentication signature or checksum did not match the expected value, so the data was rejected as invalid. The computer detected a communication frame that failed its integrity or security check, which is different from a missing message or a lost bus connection.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyProfessional

AreaNetwork wiring and bus faults

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Reading U3035

UNetwork: communication between the vehicle's control modules.

3Generic (SAE) code: it means the same thing on every OBD-II vehicle.

0Network wiring and bus faults.

35The exact fault within that area.

Often seen with

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