OBD
P0A09
DC/DC Converter Status Circuit Low
What it means
P0A09 means DC/DC Converter Status Circuit Low.
Check these first
- A failed DC/DC converter
- Short to ground in the DC/DC converter status circuit
- An open in the status circuit
- Corrosion in the DC/DC converter connector
- A weak or low 12 volt battery
What to do next
- Check the 12 volt battery state of charge
- Inspect the DC/DC converter connector
- Test the status circuit for a short to ground
- Check the converter enable signal
- Replace the DC/DC converter if the status stays low
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.