Condition where the brake, ABS, and/or TRAC warning light(s) are on and/or a Check VSC message displays

Bulletin number

T-SB-0024-19

Component

Service brakes, hydraulic

Summary

TSB: Some 2011 ? 2015 model year Prius and 2012 ? 2015 model year Prius Plug-in Hybrid vehicles may exhibit a condition where the brake, ABS, and/or TRAC warning light(s) are on and/or a Check VSC message displays. Diagnostic Trouble Codes (DTCs) C1391, C1252, C1256, and C1253 may be stored. This condition may be caused by a small internal brake fluid leak inside the brake booster assembly with master cylinder. Follow the Repair Procedure in this bulletin to address this condition.

Owners of these vehicles have filed 553 complaints in the brakes category.