What does code U3023 mean?

DTC codes / U30xx · Network wiring and bus faults / U3023

U3023Control Module Input Power Circuit A - Ignition Input On/Start Circuit Correlation

U3023 is a network communication code indicating that a control module has detected a mismatch between its main power input on circuit A and the ignition on/start signal it receives. The module compares the voltage present on its ignition input against what it expects from the power circuit, and when the two do not correlate within the allowed window, it stores this code and may disable certain functions.

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.