Toyota Corolla 2020–2021 — technical service bulletin
Bulletin T-SB-0078-21 · NHTSA communication 10202448 · issued Sep 2, 2021
Technical service bulletin
communication type
Parking Brake
component
2020–2021
model years
6
vehicle entries
Official summary
TSB: Some 2020 ? 2021 model year Corolla, Corolla Hatchback, and RAV4 vehicles may exhibit a Parking Brake Malfunction warning message on the Multi-information Display (MID) with Diagnostic Trouble Code (DTC) C059746 (Brake System Control Module "A" Calibration / Parameter Memory Failure) present. Follow the Repair Procedure in this service bulletin to address this condition.
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.