P0A79
Drive Motor B Inverter Performance
The drive motor B inverter does not deliver the expected power conversion. Switching loss elevated, gate driver fault, or capacitor degraded.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
Common causes
Ordered by how often each turns out to be the cause.
- IGBT switching characteristic degradedCommon
- DC-link capacitor agedPossible
Parts involved
- Drive Motor B Inverter
- Hybrid Control Module
P0A79 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.