P06DA code - oil pump solenoid
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If you confirm the pressure is good with a guage and that it indeed is stuck open you are good to unplug. Reason why I still recommend unplugging because you never know if it has a mind of its own and start operating again later on and worse jammed closed, destroying your engine.
Last edited by Jacobariel; Feb 25, 2025 at 09:21 AM.
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The connector on the outside, more on it here: https://mbworld.org/forums/w212-amg/...solenoids.html
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Looks something like this, depending on what engine you have, the connector may be in a different spot: https://cimg3.ibsrv.net/gimg/www.mbw...7e35d7da2a.jpg
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You can't trust that result though hence why I recommend doing a manual oil pressure check if oil pressure is good, you can unplug it, if it isn't you need to take apart the engine and fix the solenoid. Point is, you can unplug the solenoid and it will still show the exact message, the solenoid can fail and still show the message. Open circuit means there is no connection and communication from the ECU or the solenoid. Think of a wire that was connected and you sliced it in half, that is a opened circuit, has nothing to do with the oil pump solenoid in open or closed state.
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Here is forum member JettaRed's thread on how to check it on a C 63 S: https://mbworld.org/forums/c63-c63s-...asurement.html
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Oh, you have a 253.948, so a GLC, 300, so with the M274 engine. Since you have a four cylinder engine, once you confirm oil pressure is good, it might not be that difficult to get it unplugged from the top even. There is lots of room to work with compared to a V6 or V6 turbo for example.
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You can't trust that result though hence why I recommend doing a manual oil pressure check if oil pressure is good, you can unplug it, if it isn't you need to take apart the engine and fix the solenoid. Point is, you can unplug the solenoid and it will still show the exact message, the solenoid can fail and still show the message. Open circuit means there is no connection and communication from the ECU or the solenoid. Think of a wire that was connected and you sliced it in half, that is a opened circuit, has nothing to do with the oil pump solenoid in open or closed state.
With good oil pressure disconnecting will avoid a problem if it ever gets stuck close, yes?
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If I'm understanding correctly if the oil pressure is good the solenoid should be good and therefore disconnect to avoid a closed circuit but if the solenoid is bad replace the solenoid?
With good oil pressure disconnecting will avoid a problem if it ever gets stuck close, yes?
With good oil pressure disconnecting will avoid a problem if it ever gets stuck close, yes?
the solenoid is activated (to close) when ECU calls for it and will open in default state like when engine is off when there is no communication. The worry is, it could get jammed by debris. Hence why it is recommended to unplug it. So if oil pressure good, recommend just unplugging it and if you are worried about a check engine light, you can plug a dummy solenoid OUTSIDE the engine and zip tie it somewhere safe.
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The solenoid is spring loaded and if there is electricity, and ECU calls for it, it will put tension on the spring to close. Once power is cut, it will release the tension and the solenoid is in the default opened state as a result, again, debris in oil could jam it.
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Yes, you got it the solenoid is activated (to close) when ECU calls for it and will open in default state like when engine is off when there is no communication. The worry is, it could get jammed by debris. Hence why it is recommended to unplug it. So if oil pressure good, recommend just unplugging it and if you are worried about a check engine light, you can plug a dummy solenoid OUTSIDE the engine and zip tie it somewhere safe.
the solenoid is activated (to close) when ECU calls for it and will open in default state like when engine is off when there is no communication. The worry is, it could get jammed by debris. Hence why it is recommended to unplug it. So if oil pressure good, recommend just unplugging it and if you are worried about a check engine light, you can plug a dummy solenoid OUTSIDE the engine and zip tie it somewhere safe.
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Well, to explain it in a simple manner, the engine uses two pressure modes, which is why it is called a two stage oil pump solenoid. At high RPMs, the solenoid disconnects which results in the normal oil pressure mode. At idling or low RPMs like below 2000 for example, it is in low pressure mode which the ECU tells the oil pressure solenoid to close. Disconnecting it allows the solenoid to always operate in normal oil pressure mode regardless of RPM. This results in better responsiveness, less chance of scoring, less heat to the pistons and way more benefits. For more details, please see the big thread linked previously.
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
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MBWorld Fanatic!
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Think of the opportunities! Some stranger on the internet blow up his Mercecedes (Faaaaannnnceeeee Yuppy car). So, then we get to see the engine for us all to learn!
https://www.youtube.com/@I_Do_Cars
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Think of the opportunities! Some stranger on the internet blow up his Mercecedes (Faaaaannnnceeeee Yuppy car). So, then we get to see the engine for us all to learn!
https://www.youtube.com/@I_Do_Cars
https://www.youtube.com/@I_Do_Cars
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Once confirmed oil pressure is good, disconnect it.
Well, to explain it in a simple manner, the engine uses two pressure modes, which is why it is called a two stage oil pump solenoid. At high RPMs, the solenoid disconnects which results in the normal oil pressure mode. At idling or low RPMs like below 2000 for example, it is in low pressure mode which the ECU tells the oil pressure solenoid to close. Disconnecting it allows the solenoid to always operate in normal oil pressure mode regardless of RPM. This results in better responsiveness, less chance of scoring, less heat to the pistons and way more benefits. For more details, please see the big thread linked previously.
Well, to explain it in a simple manner, the engine uses two pressure modes, which is why it is called a two stage oil pump solenoid. At high RPMs, the solenoid disconnects which results in the normal oil pressure mode. At idling or low RPMs like below 2000 for example, it is in low pressure mode which the ECU tells the oil pressure solenoid to close. Disconnecting it allows the solenoid to always operate in normal oil pressure mode regardless of RPM. This results in better responsiveness, less chance of scoring, less heat to the pistons and way more benefits. For more details, please see the big thread linked previously.
Last edited by Jacobariel; Feb 26, 2025 at 11:18 AM.
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The two pressure mode is only for fuel economy and to satisfy EPA. Never to the benefit or longevity of the engine.
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I am bad at explaining things, you really should read the FAQ in the big thread previously linked but for your convenience, linking it again: https://mbworld.org/forums/w212-amg/...solenoids.html
