Check The Power Source Circuit

Disconnect the connector from the ESC control module.
Turn the ignition switch ON, measure the voltage between terminal 29 of the ESC control module harness side connector and body ground.
Specification: approximately B+

Fig 1: Measuring Voltage Between Terminal 29 Of ESC Control Module & Body Ground
Courtesy of KIA MOTORS AMERICA, INC.
Is the voltage within specification?
YES
- Check the ground circuit.
NO
- Check the harness or connector between the fuse (10A) in the engine compartment junction block and the ESC control module. Repair if necessary.