P0A11
DC/DC Converter Enable Circuit/Open
- Severity
- High
- Driving
- Drive only to a garage
The circuit the module uses to switch the DC/DC converter on is open - a broken wire, a disconnected plug, or a failed input on the converter. This is the command side rather than the reporting side: the converter may be perfectly healthy and simply never told to run. Either way the 12 volt system is not being charged, and on a hybrid or electric vehicle nothing else charges it.
Possible causes
- CommonBroken wire or disconnected plug on the enable circuit
- CommonCorroded connector
- CommonBlown fuse in the enable circuit
- PossibleFailed DC/DC converter input stage
- PossibleLow 12 volt battery voltage, so the module never completes its start-up
- RareFailed driver inside the control module
What you might notice
- 12 volt battery going flat, especially overnight
- Vehicle refusing to power up
- Several unrelated warning lights at once
- Vehicle powering down while driving
- Hybrid or electric drive system warning message
What to check, in order
- Measure the 12 volt system voltage with the vehicle powered up and ready. If it sits near battery voltage rather than around 14 volts, the converter is not running.
- Check the 12 volt battery first - it is the most common cause of scattered hybrid system codes.
- Check the enable circuit's fuse and its continuity from the module to the converter.
- Read all codes. A converter status code stored alongside this one usually means the converter is fine and the command never reaches it.
- Stop at the 12 volt system and the fuse box.
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