2016-2019 Toyota Prius and Prius Prime Low Coolant, Check Engine Light on P148F00, and/or Poor Heater Performance


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 Engine Coolant Pump Over Revolution
*Poor heater performance

The front exhaust pipe with heat exchanger assembly has been updated. Follow the Repair Procedure in bulletin T-SB-0135-19 to address this condition.

The repair is to R & R Front Exhaust Pipe Assembly with new part number 17410-37D40

*This repair is covered under the Toyota Federal Emission Warranty. This warranty is in effect for 96 months or 80,000 miles, whichever occurs first, from the vehicle’s in-service date.

*For 2016 and 2017 model year Prius and 2017 – 2019 model year Prius Prime vehicles, sold, registered, and normally operated in California, Connecticut, Maine, Maryland, Massachusetts, New Jersey, New York, Oregon, Rhode Island, and Vermont. The California Emissions Defect and Performance Warranty coverage is 180 months from the date of first use or 150,000 miles (whichever occurs first).