What does code U3036 mean?

Q: What does code U3036 mean?

Communication Authentication Signal Performance. U3036 is a network communication code indicating that a control module received an authentication signal from another module that failed the expected performance criteria, meaning the security handshake between modules did not complete correctly. The computer detected that the authentication response was missing, delayed, or outside the acceptable timing window, so it flagged the signal as out of performance range.

DTC codes / U30xx · Network wiring and bus faults / U3036

U3036Communication Authentication Signal Performance

U3036 is a network communication code indicating that a control module received an authentication signal from another module that failed the expected performance criteria, meaning the security handshake between modules did not complete correctly. The computer detected that the authentication response was missing, delayed, or outside the acceptable timing window, so it flagged the signal as out of performance range.

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.