Subaru Legacy 2015–2020 — technical service bulletin
Bulletin 11-201-21 · NHTSA communication 10188163 · issued Feb 4, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2015–2020
model years
16
vehicle entries
Official summary
This bulletin announces availability of reprogramming files to optimize the Engine Control Module (ECM). The new files will address DTC P0116 and hard starting in cold temperature concerns when an accessory engine block heater is utilized.
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.