Check engine light on GL350 after first time in the rain? Code P246B
#1
MBWorld Fanatic!
Thread Starter
Check engine light on GL350 after first time in the rain? Code P246B
First time having the GL in the rain yesterday and got a check engine light. Stopped by AutoZone for a a code read and got:
Ideas?
Ideas?
#2
I assume this is new to you truck. Have oil changed to Mercedes approved oil. Reset code and force regen with star/ das. If error comes back in couple hundred miles your dpf is clogged and would need to be replaced. $$$$. Rain has nothing to do with it. If error comes back they sold you a truck that was run with wrong oil and plugged dpf.
#3
MBWorld Fanatic!
Thread Starter
Yep, got a month ago, and the dealer did a fresh oil change, but how are we supposed to know what they put in it? Only 500 miles on it since picked up.
Mobil 1 5w40 ESP Formula M - is this the only one that can be used?
"Mobil 1 ESP Formula 5W-30 is made with a proprietary blend of leading edge components formulated to be fully compatible with the latest Diesel Particulate Filters (DPF's)"
[/QUOTE]
Mobil 1 5w40 ESP Formula M - is this the only one that can be used?
"Mobil 1 ESP Formula 5W-30 is made with a proprietary blend of leading edge components formulated to be fully compatible with the latest Diesel Particulate Filters (DPF's)"
[/QUOTE]
Last edited by Jason B; 04-19-2017 at 05:11 PM.
#4
Yes. That is the correct oil. Or used to be. It isn't it available any more as new stock. Last two years Mercedes switched to a thinner mb- specific oil. The unknown is what oil was run before that in your truck. If you have the correct oil now follow my directions in previous post sans the oil change. You might need to bring the truck in for the forced regen as it requires dealer computer (star/ das).
Edit since you edited your post- the picture now is of the "new" approved oil.
Edit since you edited your post- the picture now is of the "new" approved oil.
Last edited by alx; 04-20-2017 at 09:24 AM.
#5
MBWorld Fanatic!
Thread Starter
Thanks for the reply. So, if you're changing the oil in this truck as of today, you need to use MB branded oil from a Mercedes dealer typically?
#6
Super Member
I use liqui moly mb 229.51 that's the certification you need to look for ... typically if you gun the vehicle or run at 3 to 3.5 rpm in manual you'll start regen because it needs higher exhaust temp
#7
Mobil one 5w40 esp used to be the oil for the diesels. It is now the Mobil one 5w30 esp or the mb branded equivalent which can be found online... wait for it... cheaper than the Mobil branded one.
On alternative oils- I would try to avoid them. The Mobil oil works just fine and I have yet to see a plugged dpf on a truck where I know with certainty it ran the Mobil one oil.
Last edited by alx; 04-19-2017 at 07:00 PM.
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#9
the new dpf and sensor are easy to recognize as they would have less road grime on them and most likely new bolts on the exhaust flange for the dpf.
what is interesting is i wonder why the truck threw the original dpf in the first place. and now seems to have problems with the new dpf too... the only common reason is consistent and prolonged use of wrong oil and excessive soot accumulation in dpf...
what is interesting is i wonder why the truck threw the original dpf in the first place. and now seems to have problems with the new dpf too... the only common reason is consistent and prolonged use of wrong oil and excessive soot accumulation in dpf...
#10
MBWorld Fanatic!
Thread Starter
Thanks for the reply. Yea. A little odd. But I guess the good news is the right oil is 100% in it now. The only other thing I might be able to do is try to get the service records from the Mercedes dealer that was listed on the car fax that showed where the service was done. They also checked everything else out and said the truck looked very good and did 92 miles of driving before giving it back.
Last edited by Jason B; 05-05-2017 at 10:27 AM.
#11
Out Of Control!!
Lots of short trips are hard on the DPF (and the whole drive line).
My 08 has thrown a DPF code several times, and almost always in cold wet weather.
I am thinkin the Diff Pressure Sensor or its electrical connection does not like moisture.
My 08 has thrown a DPF code several times, and almost always in cold wet weather.
I am thinkin the Diff Pressure Sensor or its electrical connection does not like moisture.