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


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