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2010 Toyota Prius ABS Brake Warning Light On with Codes C1391, C1252, C1256, or C1253

Discussion in 'Tech Help' started by MG, Sep 22, 2018.

  1. MG

    MG Moderator

    Some 2010 model year Prius and 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 T-SB-0079-18 Revision 1 to address this condition.

    Replace the Brake Booster Assembly With Master Cylinder
    Replace the Brake Booster Pump Assembly, and Reprogram Skid Control ECU

    Toyota has issued a Warranty Extension on this vehicle condition. Please see Warranty Enhancement ZJB


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