One or more of the following conditions due to a coolant leakage at the front exhaust pipe heat exchanger:...

Bulletin number

T-SB-0135-19

Component

Engine and engine cooling: cooling system

Summary

TSB: Some 2016 ? 2019 model year Prius and 2017 ? 2019 model year Prius Prime vehicles may exhibit one or more of the following conditions due to a coolant leakage at the front exhaust pipe heat exchanger: ? Low coolant level ? MIL ON accompanied by Diagnostic Trouble Code (DTC) P148F00 ? Poor heater performance The front exhaust pipe with heat exchanger assembly has been updated. Follow the Repair Procedure in this bulletin to address this condition.

Owners of these vehicles have filed 43 complaints in the engine category.