2026-07-21 · 4 min read
Toyota Yaris Inverter Coolant Malaysia
Toyota Yaris Inverter Coolant guide and repair information for Malaysia owners.
Yaris Hybrid Inverter Coolant — Easy to Miss, Important to Do
The Yaris Hybrid power control unit (PCU) converts DC battery power to AC for the drive motor — and generates heat in the process. The inverter coolant circuit keeps the PCU and motor-generators below critical temperature. This coolant is NOT the same as the engine coolant and must not be mixed. Service interval: every 160,000 km or 10 years. Neglecting this leads to overheating of the PCU, which triggers limp mode and eventually PCU failure (replacement cost). Cost to flush and replace inverter coolant.
Hybrid Inverter Coolant — Toyota Malaysia
Toyota hybrid models (Prius, Sienta, Altis hybrid, Alphard hybrid) have a separate inverter cooling system for the power electronics. This coolant must be flushed every 5 years or 100,000 km — it is separate from the engine coolant. Use Toyota Genuine Super LLC (pink) — do NOT mix with generic coolant. Neglecting inverter coolant causes overheating of the power control unit (PCU), which can lead to a repair. Check the inverter coolant level monthly (separate reservoir under the bonnet).