What does code U3030 mean?

Q: What does code U3030 mean?

Ignition Output Start. U3030 is a network communication code indicating that a module on the vehicle's controller area network (CAN) reported a problem with the ignition output start signal, which is the command that tells certain modules to power up or begin their start-up sequence. The computer detected that the expected ignition output start message was missing, delayed, or out of sequence on the communication bus, so it flagged the fault and may have disabled some functions.

DTC codes / U30xx · Network wiring and bus faults / U3030

U3030Ignition Output Start

U3030 is a network communication code indicating that a module on the vehicle's controller area network (CAN) reported a problem with the ignition output start signal, which is the command that tells certain modules to power up or begin their start-up sequence. The computer detected that the expected ignition output start message was missing, delayed, or out of sequence on the communication bus, so it flagged the fault and may have disabled some functions.

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.