What does code U3024 mean?

DTC codes / U30xx · Network wiring and bus faults / U3024

U3024Control Module Input Power Circuit B - Ignition Input On/Start Circuit Correlation

U3024 is a generic network code indicating that a control module has detected a mismatch between its main ignition-switched power input (circuit B) and the separate ignition on/start signal it receives over the communication bus. The module compares the voltage on its power circuit B against the state reported by the ignition switch or body control module, and sets this code when the two do not agree for a calibrated period.

SystemNetwork

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

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.