P0A12
DC/DC Converter Communication
The hybrid control module loses CAN bus communication with the DC/DC converter for longer than the fault threshold.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: shop_only
Common causes
Ordered by how often each turns out to be the cause.
- CAN bus faultCommon
- Converter unpowered or offlinePossible
- Gateway module routing CAN messages incorrectlyLess likely
Parts involved
- Dc Dc Converter
- CAN Bus
- Hybrid Control Module
P0A12 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.