Toyota Corolla 2011–2012 — technical service bulletin
Bulletin Corolla PT Follo · NHTSA communication 10133820 · issued Mar 29, 2013
Technical service bulletin
communication type
Equipment
component
2011–2012
model years
2
vehicle entries
Official summary
In certain 2011 and 2012 model year Corolla vehicles manufactured at TMMMS the Positive Temperature Coefficient 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.