WenmarOpen by Wenmar Pro

Service bulletin T-SB-0121-20

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10187240
Published by NHTSA2021-02-16
Manufacturer's numberT-SB-0121-20
Manufacturer's date2020-12-14
NHTSA componentBACK OVER PREVENTION

NHTSA's summary

TSB: Some 2020 ? 2021 model year Corolla and Corolla Hybrid vehicles, and some 2019 ? 2021 model year Corolla Hatchback vehicles may exhibit a sloshing or splashing noise when turning at low speeds or when opening and closing doors. This can be caused by water inside one or more of the vehicle doors. Follow the Repair Procedure in this bulletin to address this condition.

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Driver assistance, Backup camera

Vehicles listed
TOYOTA COROLLA2020, 2021
TOYOTA COROLLA HATCHBACK2019, 2020, 2021 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Other bulletins for the same vehicles and component
T-TT-0732-232023-05-15. Service bulletin. TT: Confirm the vehicle meets the following conditions: 1) Rattle noise is coming from the brake pedal bracket assembly area AND not from other areas of the vehicle 2) Mileage is under 20,000 miles 3) Vehicle has not had previous front brake repairs performed 4) Vehicle is located in California or Oregon If the vehicle meets the above criteria, please create a TAS case. TAS will provide further instruction. If it is a weekend or holiday, continue with diagnosis and repair If the vehicle does not meet the above criteria, please proceed to diagnose the vehicle using the applicable repair manual.
T-SB-0106-20 Rev2022-12-19. Service bulletin. TSB: Some 2015 ? 2021 model year Corolla vehicles may exhibit a clicking noise when making turns greater than 90 degrees and accelerating with the steering wheel on full lock, such as when performing a U-turn. Follow the Repair Procedure in this bulletin to address this condition.
TTT0636202022-06-21. Service bulletin. TT: Some Toyota vehicles installed with Toyota Complete Maintenance Care (TCMC) brake pads may exhibit a groan or squeak noise in various driving conditions
T-TT-0599-20 Rev2021-04-19. Service bulletin. TT: Vehicle control apps might not operate as expected at times due to preconditions (normal operating parameters) not being established, vehicle settings and/or network/cellular coverage concerns.
T-TT-0636-20 Rev2021-04-19. Service bulletin. TT: Some Toyota vehicles installed with Toyota Complete Maintenance Care (TCMC) brake pads may exhibit a groan or squeak noise in various driving conditions.
T-TT-0599-20 Rev2021-02-16. Service bulletin. TT: Vehicle control apps might not operate as expected at times due to preconditions (normal operating parameters) not being established, vehicle settings and/or network/cellular coverage concerns.
T-TT-0636-202021-02-16. Service bulletin. TT: Some Toyota vehicles installed with Toyota Complete Maintenance Care (TCMC) brake pads may exhibit a groan or squeak noise in various driving conditions.
T-SB-0119-202021-01-25. Service bulletin. TSB: Some 2018 ? 2020 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool (SST) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update; however, the process for generating license keys differs from previous generations. Before attempting to perform a map update, the head unit?s expiration date must be checked. If the expiration date is still valid, a license key may be generated without the use of an activation card number. Updating the maps without the use of an activation card number is considered an Embedded Navigation Update (refer to pg. 10) and performing this process does not extend the duration of telematic map services. If the head unit?s expiration date is expired, or is expiring within the next 90 days, it should be recommended to the customer to purchase an activation number. Utilizing an activation number will initiate a Dynamic Navigation Update (refer to pg. 4). This Dynamic Navigation Update will perform the Embedded Navigation Update and provide telematic map services for a period of two years from the day that the Dynamic Navigation Update is performed. Activation card numbers are provided in an activation card number pamphlet available through the normal parts ordering system. Follow the process in this bulletin to perform the update.
T-TT-0627-202020-11-30. Service bulletin. TT: During recent discharged battery cases on vehicles equipped with LG DCM, there was confusion if a DCM update was available. Technicians are relying on the Techstream Healthcheck to determine if an update is possible.
T-SB-0106-202020-11-30. Service bulletin. TSB: Some 2015 ? 2021 model year Corolla vehicles may exhibit a clicking noise when making turns greater than 90 degrees and accelerating with the steering wheel on full lock, such as when performing a U-turn. Follow the Repair Procedure in this bulletin to address this condition.