P06DA: Engine Oil Pressure Control Circuit Open
Severity: medium
What it means: The engine computer controls an oil pressure control valve (a solenoid on or in the oil pump). P06DA means the computer sees an open or high-resistance circuit to that valve, usually from a broken or damaged wire, a bad connector or a failed solenoid. The code doesn't always mean oil pressure is low right now.
Safe to drive? Often the car drives normally, but get it checked soon. If the red oil pressure warning comes on or the engine starts ticking or knocking, stop the engine right away.
Common symptoms
- Check engine light
- Sometimes no other symptoms
- Oil pressure warning on some cars
Likely causes, ranked
- Damaged wiring harness or connector to the oil pressure control valveShop
- Failed oil pressure control valve (solenoid)Shop
- Engine computer or software fault (less common)Shop
Vehicle-specific notes
- 2019–2024 Mercedes-Benz G-Class: G550 and G63 owners got P06DA just out of warranty. Dealers said the oil pump control valve and its harness are inside the oil pan and quoted about $11,655 to $15,000 for engine-out repairs. Read the full answer · Source
DIY or shop?
Shop on most cars. Reading the code is DIY. On many engines the valve and its wiring sit inside the oil pan, and some Mercedes V8s need the engine removed or supported to reach them.
Before you replace parts
- Check the oil level and have the actual oil pressure tested with a gauge.
- Check the outside connector and wiring for damage or oil soaking.
- Ask about service bulletins, extended coverage and goodwill help for your VIN, especially if you're just out of warranty.
- Get a second quote from an independent specialist on big jobs.
Safety / mechanic note
Verify with a mechanic. Real low oil pressure can destroy an engine in minutes. Never ignore a red oil warning.