Hyundai Sonata Hybrid 2011–2015 — technical service bulletin
Bulletin 19-HC-002H · NHTSA communication 10165453 · issued Aug 9, 2019
Technical service bulletin
communication type
Electrical System
component
2011–2015
model years
5
vehicle entries
Official summary
This bulletin provides instructions for a Battery Management System (BMS) software update to optimize DTC P1B70 - HEV Battery Voltage Too Low diagnostic control logic.
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.