Inspect your spark plugs as described in chapter 7 and replace them if necessary. Also check all ignition wiring and components to be sure they are not cracked, worn or damaged in any way.
Kia Cee'd JD Service Manual: Smart Key Diagnostic Repair procedures
Inspection
Self Diagnosis With GDS
Smart key system defects can be quickly diagnosed with the GDS. GDS operates
actuator quickly to monitor, input/output value and self diagnosis.
The following three features will be major problem in SMART KEY system.
1.
...
Kia Cee'd JD Owners Manual: Active ECO operation
Active ECO helps improve fuel efficiency
by controlling the engine and transaxle.
But fuel-efficiency can be changed by the
driver's driving habits and road conditions.
When the Active ECO button is
pressed the ECO indicator (green) will
illuminate to show that the Active ECO
is ...