Code result
P0A78
Drive Motor A Inverter Performance
High severity
What it means
The drive motor A inverter does not deliver commanded torque within tolerance under load, indicating thermal limit or partial IGBT failure.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Thermal derating active
highOne of the most commonly reported causes for this code — check this first.
Partial IGBT failure
mediumA plausible cause — test and verify before replacing parts.
Related help
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