P06DA on Mercedes-Benz: How to Diagnose & Fix
Engine Oil Pressure Control Circuit/Open
2 Mercedes-Benz models · 2 documented issues · 1 critical · $250-$4,500 repair
P06DA on Mercedes-Benz by model: symptoms, diagnosis and fix
The M270 uses a two-stage variable-displacement oil pump whose output is switched by a PWM solenoid (Y130) mounted inside the oil pan, with its wiring harness routed through the pan and out an oil-tight connector. The solenoid winding fails open, or the in-pan harness insulation chafes, and the ME control unit sets P06DA00 - 'electrical fault / open circuit in the valve actuation of the engine oil pump.' The engine defaults to one pressure stage, so it usually still drives, but owners report an oil pressure or engine warning, a check engine light that returns immediately after clearing, and in some cases a low-oil-pressure red warning at hot idle. Because the valve lives inside the sump, the repair is far more invasive than the part cost suggests - on 4MATIC cars the front subframe and driveshaft have to come down to drop the pan.
Common Symptoms
- Check engine light with P06DA00
- Oil pressure warning message
- Fault returns immediately after clearing
- Engine stays in one oil pressure stage
- Occasional low oil pressure at hot idle
How to Fix
Do not replace the oil pressure sensor on the strength of the warning alone - read the code and back-probe the Y130 circuit for an open. Drop the oil pan and replace the oil pump control solenoid and the in-pan harness/connector as a set (harness damage is often the true cause even when the solenoid tests bad). Replace the oil pan gasket, refill with the correct MB 229.5/229.51 spec oil, and clear the fault. On 4MATIC X156 cars budget extra labor for subframe/driveshaft removal.
Sources for this issue (2)
The gasoline X166 GLS engines - M276 3.0 biturbo V6 (GLS 450), M278 4.7 biturbo V8 (GLS 550) and M157 5.5 biturbo V8 (AMG GLS 63) - share a well-documented failure where the seals inside the camshaft adjuster magnets (solenoids) and camshaft position sensors give up and pressurized oil is pushed into the sensor's electrical connector. From there the oil wicks along the wire strands into the main engine harness and can reach the ECU and other connectors. Early signs are oil in the cam-magnet plug and a wet valve-cover area; if ignored it produces cam-timing faults (P0016-family and P06DA-type codes), rough running and a harness or ECU replacement bill. MBWorld threads document dealers resealing solenoids under warranty and owners asking Mercedes for a campaign that was never issued.
Common Symptoms
- Oil inside camshaft magnet or cam sensor electrical connector
- Oil seeping at the front of the valve cover
- Check engine light with camshaft correlation codes
- Rough idle or misfire after oil reaches other connectors
- Oil found inside ECU connector
How to Fix
Replace the leaking camshaft adjuster magnet(s) and/or cam sensor with the current revised part and, if any oil is in the connector, install the Mercedes harness-extension 'pigtail' repair sections so the contaminated section is cut out and the oil cannot migrate further. Check the connectors at every oil change on these engines. Solenoid plus pigtail is about $250-600 per position; if the harness or ECU is already saturated, $2,000-4,500. No recall or extended warranty exists.
Sources for this issue (4)
P06DA code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P06DA mean on a Mercedes-Benz?
P06DA stands for "Engine Oil Pressure Control Circuit/Open." This code indicates the engine computer detected an open circuit (or other fault) in the engine oil pressure control circuit, typically the wiring or solenoid that regulates a variable-displacement oil pump. The PCM monitors this circuit to maintain proper oil pressure for lubrication and variable valve timing. Because loss of oil pressure can quickly cause severe engine damage, this should be treated as urgent. On Mercedes-Benz it is documented across 2 models: GLA, GLS.
What are the most common causes of P06DA?
The most common causes of P06DA are: Faulty oil pump control solenoid/valve, Open or shorted wiring in the control circuit, Corroded or loose solenoid connector, Low oil level or low oil pressure, Faulty oil pressure sensor, PCM control circuit fault. The specific cause varies by vehicle.
How much does it cost to fix P06DA on a Mercedes-Benz?
Published repair estimates on Mercedes-Benz range from $250 to $4,500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P06DA on a different make?
View P06DA across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.