P0A93Inverter A Cooling System Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The power inverter of a hybrid has its own coolant circuit with an electric pump, radiator and fan, separate from engine cooling. P0A93 is set when this circuit does not cool as intended. CARB lists inverter thermal management among the components that hybrid OBD must monitor. Hyundai documents the code for the 2011 Sonata Hybrid (bulletin 14-HC-001), assigning it, like P0C73, to the electric water pump; symptoms include a hybrid warning, no EV mode and poor acceleration. Toyota recalled 2004–2009 Prius models (12V-536) because the inverter water pump could fail and cause a stall; that notice does not name a code. A leaking or air-locked circuit should also be checked.
- What you may notice
- Hybrid system warning and MIL
- No EV mode, reduced power
- Vehicle may not start or may stall
- Likely causes
- LikelyElectric inverter coolant pump failed or seized
- PossibleLow coolant or air in the inverter circuit
- PossiblePump wiring, fuse or relay fault
- RareRadiator fan not running or radiator blocked
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.