P0A7A: Generator Inverter Performance
Severity: high
What it means: P0A7A means the hybrid computer received a failure signal from the part of the inverter that runs the generator (one of the hybrid's electric motor-generators). It often points to an internal inverter fault or overheating.
Safe to drive? Don't plan on driving far. The car often goes into limp mode (reduced power) or won't drive normally.
Common symptoms
- Check Hybrid System or red triangle warning
- Limp mode or loss of power
- Often shows up with P0A94 on Toyota hybrids
Likely causes, ranked
- Failed power module inside the inverterShop
- Inverter overheating from a cooling problemShop
- Wiring fault between the inverter and the motor-generatorShop
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Vehicle-specific notes
- 2010–2015 Toyota Prius: On PriusChat, a 2010 Prius owner with P0A94 and P0A7A got the inverter's power module replaced free under Toyota's ZE3 warranty enhancement. Read the full answer · Source
DIY or shop?
Shop. The inverter carries dangerous high voltage. DIY is limited to reading codes and checking the 12V battery.
Before you replace parts
- Read all hybrid codes and note any that appear with P0A7A.
- Check the 12V battery.
- Ask a Toyota dealer whether a warranty enhancement or recall covers the inverter on your VIN.
- Have a hybrid-qualified shop diagnose the inverter.
Safety / mechanic note
Verify with a mechanic. Hybrid inverters carry high voltage. Never open one yourself. A code points to a circuit or system, not always a specific part.
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