Toyota Corolla 2023 — technical service bulletin
Bulletin 23TC02a · NHTSA communication 10241413 · issued Jul 27, 2023
Technical service bulletin
communication type
Engine and Engine Cooling
component
2023
model years
1
vehicle entries
Official summary
RL: Due to certain programming in the brake ECU, under certain conditions, DTC U0100 is stored and cannot be cleared even though a technician attempts to do so. This condition does not affect the vehicle operation.
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.