Hyundai Santa FE Plug-In Hybrid 2021–2023 — technical service bulletin
Bulletin 23-EE-004H · NHTSA communication 10233557 · issued Mar 31, 2023
Technical service bulletin
communication type
Power Train
component
2021–2023
model years
3
vehicle entries
Official summary
This bulletin provides information related to the Hybrid Control Unit (HCU) software update for Santa Fe Plug-in Hybrid (TM PHEV) vehicles to improve the following symptom: 1. Oil Dilution: Some vehicles may experience increased oil consumption and white smoke due to the diluting of engine oil with fuel because of the frequent transition between EV â Engine mode during the winter season a. Modify fuel injection strategy below 10â and add oil heating function based on the driving pattern.
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.