The above situations are normal conditions when the active eco system is activated to improve fuel efficiency.
Active ECO operation
Limitation of Active ECO operationKia Cee'd JD Service Manual: Muffler Components and components location
Components
1.
Front muffler
2. Gasket
3.
Hanger
4. Center & main muffler
...
Kia Cee'd JD Owners Manual: Limitation of Active ECO operation
If the following conditions occur while
Active ECO is operating, the system
operation is limited even though there is
no change in the ECO indicator.
When the coolant temperature is low:
The system will be limited until engine
performance becomes normal.
When driving up a hill: The ...