Toyota RAV4: A25A-FXS Hybrid Inverter Electric Coolant Pump Failure

The XA50 RAV4 Hybrid uses a dedicated electric water pump to cool the high-voltage inverter. This pump is prone to failure from bearing wear and impeller degradation, causing inverter overheating. The coolant warning light illuminates, and the hybrid system enters a reduced-power or shutdown state to protect the inverter. Toyota Australia issued a service campaign for early units. Failure on affected vehicles typically occurs between 60,000–130,000 km and is well-documented across Australian owner communities. Delayed repair risks inverter damage costing substantially more.

• Coolant temperature warning light on dash
• Hybrid system power reduction warning
• Inverter overtemperature DTC stored (P0A93, P0AA6)
• Audible change in pump noise from engine bay
• System enters limp mode in warm conditions

1. 1

   With engine warmed up, listen for the inverter coolant pump (distinct quiet hum near front of engine bay).

2. 2

   Scan for P0A93 and related inverter cooling DTCs.

3. 3

   Check coolant level in the small inverter reservoir (separate from engine coolant).

4. 4

   Ask if Toyota's inverter pump service campaign has been completed.

Parts involved: Water pump.

≈A$640 to ≈A$2,020 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

• “Has the vehicle been through the Toyota inverter coolant pump service campaign?”
• “Has any coolant warning light appeared on the dash?”
• “Has the hybrid system ever entered reduced power mode?”

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.