2021 S63 wouldn't start, with weird transmission cooling message
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2021 S63 wouldn't start, with weird transmission cooling message
Issue in title. Less than 20,000 miles. Bought CPO. Still under factory warranty. Single time episode recently where the car would not start.
Was driven from cold for perhaps 30 minutes. Not hard. Parked for 30 to 45 minutes.
Thereafter, would not start. Ignition would switch on. Battery was fully charged. Starter would not attempt to turn over the engine. Intermittent error message on the dash about leaving the engine running (it had not been running for about 45 minutes), stating the transmission was cooling. Have never seen that before. Coolant and oil temperatures were well normal.
Contacted Mercedes Me in-car which was useless. They attempted roadside tow which was unavailable at the time where I was.
A couple hours later, the car started. Upon getting home, noticed higher than usual oil temps (at one point hitting red on dash with only a little revving). Coolant temp still fine.
Dash says oil level is fine.
Weather 70s-80s F and rain.
Getting OBD2 scanner to glean what I can. Schedule doesn't allow dealership for a few days.
Anyone ever have this happen? Any thoughts?
Was driven from cold for perhaps 30 minutes. Not hard. Parked for 30 to 45 minutes.
Thereafter, would not start. Ignition would switch on. Battery was fully charged. Starter would not attempt to turn over the engine. Intermittent error message on the dash about leaving the engine running (it had not been running for about 45 minutes), stating the transmission was cooling. Have never seen that before. Coolant and oil temperatures were well normal.
Contacted Mercedes Me in-car which was useless. They attempted roadside tow which was unavailable at the time where I was.
A couple hours later, the car started. Upon getting home, noticed higher than usual oil temps (at one point hitting red on dash with only a little revving). Coolant temp still fine.
Dash says oil level is fine.
Weather 70s-80s F and rain.
Getting OBD2 scanner to glean what I can. Schedule doesn't allow dealership for a few days.
Anyone ever have this happen? Any thoughts?
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Joined: Jun 2021
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Me is thinking you have an electrical more than a mechanical....not sure if that is good or bad news. Either way, checking the trans fluid is all but impossible to do "on the cheap" unless you have one heck of a garage setup.
I had that error LONG ago, and it was in a BMW M3 (SMG). In that instance it was a sensor and not too awful costly to repair.
I had that error LONG ago, and it was in a BMW M3 (SMG). In that instance it was a sensor and not too awful costly to repair.
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Joined: Feb 2006
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Issue in title. Less than 20,000 miles. Bought CPO. Still under factory warranty. Single time episode recently where the car would not start.
Was driven from cold for perhaps 30 minutes. Not hard. Parked for 30 to 45 minutes.
Thereafter, would not start. Ignition would switch on. Battery was fully charged. Starter would not attempt to turn over the engine. Intermittent error message on the dash about leaving the engine running (it had not been running for about 45 minutes), stating the transmission was cooling. Have never seen that before. Coolant and oil temperatures were well normal.
Contacted Mercedes Me in-car which was useless. They attempted roadside tow which was unavailable at the time where I was.
A couple hours later, the car started. Upon getting home, noticed higher than usual oil temps (at one point hitting red on dash with only a little revving). Coolant temp still fine.
Dash says oil level is fine.
Weather 70s-80s F and rain.
Getting OBD2 scanner to glean what I can. Schedule doesn't allow dealership for a few days.
Anyone ever have this happen? Any thoughts?
Was driven from cold for perhaps 30 minutes. Not hard. Parked for 30 to 45 minutes.
Thereafter, would not start. Ignition would switch on. Battery was fully charged. Starter would not attempt to turn over the engine. Intermittent error message on the dash about leaving the engine running (it had not been running for about 45 minutes), stating the transmission was cooling. Have never seen that before. Coolant and oil temperatures were well normal.
Contacted Mercedes Me in-car which was useless. They attempted roadside tow which was unavailable at the time where I was.
A couple hours later, the car started. Upon getting home, noticed higher than usual oil temps (at one point hitting red on dash with only a little revving). Coolant temp still fine.
Dash says oil level is fine.
Weather 70s-80s F and rain.
Getting OBD2 scanner to glean what I can. Schedule doesn't allow dealership for a few days.
Anyone ever have this happen? Any thoughts?
Last edited by haa; Jul 10, 2024 at 07:52 PM.
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From: Pacific Northwest
2001 S600 V12 Sold, 2011 Jaguar XFR Sold, 2017 S550 4-Matic, 2018 S63 AMG Sedan
Only thing I could say at this point is to look at anything you've done that has changed things recently. In prior posts, you mentioned something about tapping power for a radar detector. Did you do that? If so, what did you tap into. On an older post you mentioned jerky driving, or at least I think that was you. How has your transmission behaved over the last couple months? No way to tell if any of those things are related, but if you've done anything electrical I sugges you revert to factory then see what happens. Keep up posted on your progress, please.
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Joined: May 2013
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Only thing I could say at this point is to look at anything you've done that has changed things recently. In prior posts, you mentioned something about tapping power for a radar detector. Did you do that? If so, what did you tap into. On an older post you mentioned jerky driving, or at least I think that was you. How has your transmission behaved over the last couple months? No way to tell if any of those things are related, but if you've done anything electrical I sugges you revert to factory then see what happens. Keep up posted on your progress, please.
MBWorld Fanatic!
Joined: Aug 2007
Posts: 1,830
Likes: 793
From: Pacific Northwest
2001 S600 V12 Sold, 2011 Jaguar XFR Sold, 2017 S550 4-Matic, 2018 S63 AMG Sedan
I did end up tapping to the driver's side dash compartment months ago; other than the annoyance of it being always-on, that has otherwise worked flawlessly. The transmission is unchanged. Since the original post, the issue in question hasn't recurred, either. Hesitant to write it off as some rare fluke and have it happen at an even more inopportune time. Awaiting ability to visit dealership.
