Service bulletin T-SB-0013-23

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)
Type	Service bulletin
NHTSA id	10234318
Published by NHTSA	2023-04-17
Manufacturer's number	T-SB-0013-23
Manufacturer's date	2023-03-09
NHTSA component	ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); LANE DEPARTURE

NHTSA's summary

TSB: Some 2016 ? 2018 model year Prius V vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning lights are on and/or a Check VSC message displays. One or more of the following Diagnostic Trouble Codes (DTCs) C1391, C1252, C1256, and/or C1253 will be stored in the vehicle?s memory to be used as verification. This condition may be caused by a small brake fluid leak inside the brake booster assembly with master cylinder.

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

Trouble codes named

C1252, C1253, C1256, C1391

Vehicles listed
TOYOTA PRIUS V	2016, 2017
TOYOTA PRIUS V	2018 (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
TTT063620	2022-06-21. 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-SB-0088-21	2021-11-15. Service bulletin. TSB: For proper calibration of the millimeter wave radar sensor, the vehicle and radar target must be on a level surface with a consistent plane. If a level surface with a consistent plane is not available, use the Floor Slope Compensation Procedure in this service bulletin in conjunction with the appropriate model and model year Repair Manual instructions when adjusting the millimeter wave radar sensor.
T-TT-0663-21	2021-10-25. Service bulletin. TT: When used in conjunction with the Repair Manual, these Blind Spot Monitor, Forward Recognition Camera, and Front Millimeter Wave Radar tips leverage SSTs and readily available tools to support target placement in varying shop environments.
T-TT-0636-20 Rev	2021-04-19. 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-0636-20	2021-02-16. 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-TT-0537-19_Rev	2020-05-11. Service bulletin. TT: The blind spot monitor (BSM) sensor angle inspection is used to confirm that the BSM sensor is within the specified angle before performing axis beam adjustment. When used in conjunction with the repair manual, these BSM tips leverage SSTs and readily available tools to support sensor angle confirmation in varying shop environments.
T-TT-0603-20	2020-04-20. Service bulletin. TT: For proper calibration of the millimeter wave radar sensor, the vehicle must be on a level surface. If a level surface is not available, this tech tip should be used in conjunction with the repair manual to set the angle of the front millimeter wave radar sensor and reflector height before performing beam axis adjustment.
T-SB-0149-19	2019-12-02. Service bulletin. TSB: Some 2017 ? 2018 model year Prius Prime vehicles may exhibit corrosion on the back door sub-assembly steel reinforcement panel visible below the opener switch and rear camera. Follow the Repair Procedure in this bulletin to address this condition.
T-TT-0515-18	2019-02-19. Service bulletin. TT: When adjusting the Forward Recognition Camera on vehicles with Toyota Safety Sense, it can be difficult to print the repair manual target to the proper size.
T-TT-0503-18	2018-12-03. Service bulletin. TT: When used in conjunction with the Repair Manual, these Blind Spot Monitor, Forward Recognition Camera, and Front Millimeter Wave Radar tips leverage SSTs and readily available tools to support target placement in varying shop environments.