P0A10
DC/DC Converter Status Circuit High Input
- Severity
- High
- Driving
- Drive only to a garage
The DC/DC converter status circuit is reading high - typically a short to voltage or a lost earth. The module cannot tell whether the converter is charging the 12 volt system, so it cannot rely on it. On these vehicles the DC/DC converter does the job an alternator does on a conventional car, and nothing else can do it.
Possible causes
- CommonWiring a short to voltage or a lost earth on the status circuit
- CommonCorroded or damaged connector
- CommonFailed DC/DC converter
- PossibleBlown fuse in the converter's supply or output
- RareFailed control module input
What you might notice
- 12 volt battery going flat
- Multiple unrelated warning lights
- Vehicle powering down unexpectedly
- Dim lights, or a battery warning lamp
What to check, in order
- Measure the 12 volt system voltage with the vehicle powered up. Around 14 volts means the converter is working and the fault is in the status circuit; around 12 and falling means the converter itself.
- Check the converter's fuses on both sides.
- Inspect the status circuit connector and wiring for corrosion and damage.
- Replace the 12 volt battery only after the converter is confirmed working, not before.
- Stop at the 12 volt system. Anything further needs the manufacturer's high-voltage procedure.
Read this code from your own car
Plug an ELM327 adapter into the OBD-II port under the dashboard. Pin16 reads every stored, pending and permanent code, explains each one like this page does — offline, with no account — and shows what the car recorded when the fault was set.
Where this code sits
P00xxP01xxP02xxP03xxP04xxP05xxP06xxP07xxP08xxP09xxP0AxxP0BxxP0CxxP0DxxP0ExxP0FxxP10xxP11xxP12xxP13xxP14xxP15xxP16xxP17xxP18xxP19xxP1AxxP1BxxP1CxxP1DxxP1ExxP1FxxP20xxP21xxP22xxP23xxP24xxP25xxP26xxP27xxP28xxP29xxP2AxxP2BxxP2CxxP2DxxP2ExxP2FxxP30xxP31xxP32xxP33xxP34xxP35xxP36xxP37xxP38xxP39xxP3AxxP3BxxP3CxxP3DxxP3ExxP3Fxx