P0A94: DC/DC Converter Performance
Severity: high
What it means: The hybrid control computer received a fail signal from the boost (DC/DC) converter inside the inverter, for example from overheating, an internal short or too much current.
Safe to drive? No, not for long. Toyota says the car enters fail-safe mode with reduced power, and some cars stall. Have it towed or driven gently straight to a dealer.
Common symptoms
- Red triangle master warning and several warning lights
- Check-engine light
- Reduced power (fail-safe or limp mode)
- Car may shut down or refuse to go into READY
Likely causes, ranked
- Boost converter or IPM failure inside the inverterShop
- Inverter cooling problem (pump or coolant)Shop
- Inverter wiring or connector faultShop
- Hybrid transaxle fault causing over-currentShop
Vehicle-specific notes
- :
What it means: The hybrid control computer received a fail signal from the boost (DC/DC) converter inside the inverter, for example from overheating, an internal short or too much current.
Severity: High. Safe to drive? No, not for long. Toyota says the car enters fail-safe mode with reduced power, and some cars stall. Have it towed or driven gently straight to a dealer.
DIY or shop?
Shop or dealer. The inverter carries high voltage. Checking the inverter coolant level is the only safe DIY step.
Vehicle notes
- On 2010–2015 Prius and 2012–2017 Prius V, Toyota's bulletins name this code as an inverter fault. Recalls and an IPM warranty enhancement may cover the repair. Check your VIN.
Before you replace parts
- Read all stored codes, including detail (INF) codes on Toyota hybrids.
- Check your VIN for recalls, service bulletins and extended coverage.
- Clear the code only after a repair, then confirm it stays off.
Safety / mechanic note
Verify with a mechanic. Hybrid systems carry dangerous high voltage. A code points to a circuit or system, not always a specific part.