DTC C1503 ESC Switch Error: DTC Detecting Condition

WARNING: This page is about a different car, the 2007 Kia Optima, 2007 Kia Magentis, 2006 Kia Optima, and 2006 Kia Magentis. However, it is still accessible from the selected car via links, so may be relevant.

DTC DETECTING CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	Short circuit monitoring	Open or short ESC switch
Detect Mode	Initial Check Outside the ABS control cycle Inside the ABS control cycle Diagnosis mode Failure mode
Enable Conditions	When the ESC switch is ON for 60 sec.
Fail Safe	Inhibit the ESC control and allow the ABS/EBD control. Meanwhile, stop checking the ESC switch failure under the ESC control. The ESC warning lamps are activated.