Part of the generic U0423 overview — this page covers the Jeep meaning specifically.
OBD-II Diagnostic Trouble Code
U0423
Invalid data received from instrument cluster
U
Network
modules / CAN bus
modules / CAN bus
0
Generic
SAE standard
SAE standard
4
Network subsystem
23
Invalid data received from instrument cluster
Severity · general guide
Moderate
Module communication fault
Code type
Jeep
System
Network
Model
Grand Cherokee
Years
2011