P1778 Kia Transmission Reverse I/P Circuit Malfunction
Possible causes
– Faulty Step Motor
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1778 Kia Description
The step motor’s 4 aspects of ON/OFF change according to the signal from Transmission Control Module (TCM). As a result, the flow of line pressure to primary pulley is changed and pulley ratio is controlled. This diagnosis item detects when electrical system is OK, but mechanical system is NG. This diagnosis item detects when the state of the changing the speed mechanism in unit does not operate normally.
Kia Vehicle:Kia Amanti,Kia Borrego,Kia Forte,Kia Optima,Kia Rio,Kia Rondo,Kia Sedona,Kia Sorento,Kia Spectra,Kia Sportage,Kia Sorento,Kia KM420,Kia Cadenza,Kia Picanto,Kia Borrego,Kia Forte