P2AD4
Intermediate System Voltage Low
The intermediate (DC-link) system voltage in the hybrid power electronics is below the expected window. Common in HEV/EV inverter circuits when the DC bus drops under load.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- HV battery output low under loadCommon
- DC-link capacitor aged - increased ESRPossible
Parts involved
- Dc Link Capacitor
- Hv Battery
- Inverter
P2AD4 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.