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Home >> Kia >> 2017 >> Optima Plug-In Hybrid EX >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transaxle System Diagnosis (PHEV) >> DTC P1777: OPU Power Control Circuit Failure >> General Information >> General Description
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General Information: General Description

Electric Oil Pump (EOP) provides hydraulic pressure to engage and release clutch/brake of the transmission.

It supplies ATF or generates hydraulic pressure in all sector (always active after start-up).

Oil Pump Unit (OPU) is controlled so that EOP can supply the oil flow to the transmission properly.