Toyota Corolla 2011–2012 — technical service bulletin
Bulletin TC-12-028 · NHTSA communication 10134032 · issued Oct 3, 2012
Technical service bulletin
communication type
Engine
component
2011–2012
model years
2
vehicle entries
Official summary
In certain 2011 and 2012 Model Year Toyota Corolla vehicles manufactured at TMMMS, the Positive Temperature Coefficient (PTC) Heater relays were not installed.
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.