P0A09
DC/DC Converter Status Circuit
The hybrid control module detects an electrical fault on the DC/DC converter status feedback line. This converter steps high-voltage battery output down to 12 V for the auxiliary system.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: shop_only
Common causes
Ordered by how often each turns out to be the cause.
- DC/DC converter internal faultCommon
- Communication loss with converterPossible
Parts involved
- Dc Dc Converter
- High Voltage Battery
- Wiring Harness
P0A09 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.