The car still drives ok but I guess it uses more gas. doese it hurt anything to drive it without overdrive?
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2001 Kia Sephia Question: My overdrive went out
Answer #1patrick mannion from Greg Solow's Engine Room, April 13, 2009, 02:48Master
Kia have changed there recomendations for transmission oil for this transmission from Dexron 3 to Mitsubishi SP 3 oil.
I don't see a separate fuse for the Over drive, I wonder if the switch could be bad? you assumptions are correct the engine will be working a little harder and the gas mileage will be a little worse.