Kia Optima Hybrid 2011–2015 — technical service bulletin
Bulletin PS316 · NHTSA communication 10109656 · issued May 28, 2014
Technical service bulletin
communication type
Electrical System
component
2011–2015
model years
5
vehicle entries
Official summary
PIT STOP: ?HYBRID SYSTEM WARNING!? MESSAGE IN CLUSTER AND MIL-ON WITH DTC P1784 - When diagnosing an Optima Hybrid with a ?Hybrid System Warning!? message (A) in the cluster, the malfunction indicator lamp (MIL) on and DTC P1784 (EOP 3-Phase Wiring Line Open), in either active or in history, check for contact between the Electric Oil Pump (EOP) harness and the oil cooler hose clamp (B). If the harness is visibly damaged from contact (C), repair or replace as needed.
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.