P06DA
Engine Oil Pressure Control Circuit Open
Modern engines use an electrically controlled variable-displacement oil pump or a pressure regulator solenoid. The control circuit on this regulator has an open circuit - the ECU cannot vary oil pressure with load and the pump runs at default mechanical pressure.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Common causes
Ordered by how often each turns out to be the cause.
- Open in solenoid or wiringCommon
- Pin pushed back out of connector bodyLess likely
- Cracked solder joint inside the module or sensorLess likely
Parts involved
- Oil Pressure Regulator
- Variable Displacement Oil Pump
P06DA 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.