OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P0A09?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyDC/DC converter internal fault
- PossibleCommunication loss with converter
Repair at a glance
- Difficulty
- Shop_only
- DIY friendly
- Best left to a mechanic
- Typical labour
- 3–10 h
- Emissions test
- Usually unaffected
- Parts involved
- Dc Dc Converter, High Voltage Battery, Wiring Harness
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.