What does code U0221 mean?

Q: What does code U0221 mean?

Lost Communication With 'Door Switch G'. U0221 is a network communication code indicating that one or more control modules on the vehicle's Controller Area Network (CAN) bus have stopped receiving messages from the module responsible for 'Door Switch G'. The computer has detected a loss of the periodic status signal that this switch normally broadcasts, which can be caused by a faulty switch, a wiring fault, or a problem with the module that reports the switch state.

DTC codes / U02xx · Lost communication with a control module / U0221

U0221Lost Communication With 'Door Switch G'

U0221 is a network communication code indicating that one or more control modules on the vehicle's Controller Area Network (CAN) bus have stopped receiving messages from the module responsible for 'Door Switch G'. The computer has detected a loss of the periodic status signal that this switch normally broadcasts, which can be caused by a faulty switch, a wiring fault, or a problem with the module that reports the switch state.

SystemNetwork

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaLost communication with a control module

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