Toyota Corolla 2023 — technical service bulletin
Bulletin TTT074323 · NHTSA communication 10247818 · issued Nov 17, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2023
model years
1
vehicle entries
Official summary
TT: MIL On with DTC P045600 Evaporative Emission System Leak Detected (Very Small Leak)
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.