Inverter Coolant Pumps – What’s The Deal?

You may have seen a POA93 code after scanning your hybrid vehicle. This code indicates a failing Inverter Coolant Pump and is a common problem with the Gen. 2 (2004-2009) Toyota Prius. This pump is needed to keep your inverter system, well, cool!

The inverter system works in tandem with your hybrid battery system so that your hybrid vehicle battery charges. As an example, the inverter takes the AC current from your regenerative braking system and converts it to DC current to charge your HV battery - and vice versa.

Quite often the pump will function intermittently before failing completely. If your inverter coolant pump fails - replace it immediately.

Immediate replacement will prevent your inverter/hybrid drive from overheating which is a much more costly repair, AND it could potentially save your HV battery. If PriusKings doesn’t need to service your vehicle, the happier customer you’ll be, and the happier we will be for you.

However, PriusKings will often need to replace a hybrid battery after an inverter coolant pump failure - this is common unfortunately as many drivers continue driving the vehicle after their inverter begins to fail. We’re here to help guide you if this is the case with your vehicle.

Book a diagnostic service with us – we’re happy to help provide more information on inverter coolant pumps and your hybrid battery system.