Part of the generic C1812 overview — this page covers the Hyundai meaning specifically.
OBD-II Diagnostic Trouble Code
C1812
CAN timeout - gateway
C
Chassis
brakes / steering
brakes / steering
1
Mfr
manufacturer code
manufacturer code
8
Chassis subsystem
12
CAN timeout - gateway
Severity · general guide
High
Brakes/steering — inspect soon
Code type
Hyundai
System
Chassis