Hi folks, I have a weird situation with my gl350 2010
last week, my battery died and I had to jump it to start.
after 50 km, I had CEL on, and it shows the error p2047 on my Bluetooth diag system: a fault is present in the reductant injection valve circuit, bank 1 unit 1
after a heavy rain, I received fault errors for rear bulbs ( all of them)
after 1 day, the AdBlue countdown started.
I took the car to the dealership and they changed the valve and the problem still exists. in the dealership drive test, my bulb errors come up again and the fuel gauge stops working.
dealership mechanic told me it can be a software update problem for AdBlue warning and it's a risk of burning out ECU during the update and if it's happened, I responsible for buying and replacing new ECU and it's a possibility adblue warning can still exist and I need to pay more if they can't find the problem.

is it make any sense to you?? any recommendations about the issue?

 

Nope, this makes no sense to me.

 

Diesel MBs post 2007 are fraught with problems. Consider dumping the vehicle, as difficult an idea as that may be.

 

But it's 2010...

 

Get rid of this car quickly. You seem like a fellow without the DIY skills needed to keep this car running in acceptable condition. If you have to take this car to the dealer or an independent mechanic for every little thing it will throw at you your going to spend more money on repairs than the car is worth every year you have it.

 

Yes, we agree on this. Dump that puppy.

 

So sorry, this will not end well. Dump the diesel. I've been saying it for over a decade when the pattern of failure was apparent early on. Also sounds like you have a water intrusion problem. The water intrusion issue ended up totaling my GL450 so that is not just a diesel issue and can happen to all 164 GL's.

 

There's a good chance your problem has nothing to do with the fact that your engine uses diesel (which is great, by the way!). You mentioned "after a rain"... Check in the rear, left subfloor area (below the taillights) for water. Also check in the battery area.

 

thank you all for your reply, actually, I bought my first MB last week and all errors come up after a couple of hours! I'm an electronic control engineer and I think dealership doesn't want to spend time to find the problem because it can be time-consuming, I'm suspicious to SAM and ECU water penetration. I think for the next step I need to check electronic components because it seems random errors come up and each time it's different, it can be CANBUS miscommunication. do you have any drawings for ECU and SAM wiring diagram?

 

I have all mentioned problems. it should be a SAM problem I think.

https://www.mercedesmedic.com/mercedes-sam-module/

 

Absolutely right here, Dennis… This is classic water intrusion. That makes this a parts car to start with agnostic of the power plant.

The fact that it’s a diesel and it’s going to present a host of other problems puts it squarely in the don’t bother with it category. If it were a gasser it might be salvageable depending upon how long this water intrusion has been going on.

 

These older (2007-2012) diesels should all be in the junkyard by now. Do yourself a favor, and get rid of it. If you like the vehicle, replace it with a gasoline version.

 

thank you for your support, it's a bit concerned for me if purchasing a used blutec was a good idea? before my purchase, I did a couple of searches to know if buying a gl350 blutec is a good idea or not, at that time the conclusion was positive about buying it so I did but in here, I can see lots of comments about getting rid of it, it confused me :-(
P.S. is the Adblue valve connected to the rear SAM??

 

@mabab if you truly want to keep this vehicle, and if you are not financially independent, you need to DIY the maintenance and repair. There will be alot of it. Buy WIS/EPC from ebay and contact @BenzNinja about a XENTRY system. These are required to maintain this vehicle.

X164 are known for water leaks that cause problems in the electrical system. This is not related to Bluetec but you need to aggressively find and fix any water leaks otherwise your Bluetec work will be muddled by electrical problems.

Bluetec has no fix, it is a disaster system. You can repair things over and over. But you will not find yourself in paradise at any point in time. Oil cooler leak is a common complaint, it's a big job. Turbo and intake related problems are also reported on this site. The DEF/AdBlue system is problematic.

Bosch engineered the components and system for the Bluetec Mercedes and VW vehicles, with equal results for both car companies. It is junk, particularly in North America where fuel quality is apparently different than in the homeland of MB, VW and Bosch.

 

Mabab, I own a diesel - for about 6 or 7 years, now and have been very happy. Mine is pre-bluetec so I don't have the ad-blue system - but from what I've read it does come some problems once in a while. I don't know the specifics as it never pertained to me - but it seems like talking to long time owner's of bluetec's and finding out what solutions they've done would be good. The Jeep forum, by the way, has many more owners of these engines and they are much more adept at finding solutions. There are a few other ancillary systems that may need attention - but they can all be fixed and, depending on the fix, even be eliminated all together.

Oil cooler seals is probably the most common issue - it was a bad design having the oil cooler deep in the engine "V". I used some extra "sealant" when putting mine back together to hopefully eliminate a leak. If I ever had to dive into that again, I would look into creating a block-off plate and simply re-routing the oil to a standard oil cooler that mounts behind/in front the radiator. Or... leave it alone and plan on replacing the oil cooler seals every 5-ish years. It's not a horrible job for someone with expereince so it's not THAT expensive - especially if you can find a local repair shop that you trust. But again, it's not like you're doing it every year.

The EGR is another one. But this can also be completely eliminated as a potential problem... for very little money, too.

The point is - with a little patience and some well thought out repairs, it can be a great vehicle. For me, the benefits of the diesel outweigh the minor inconveniences - although by now I have them pretty well addressed.

 

My 2007 diesel purchased new has had very few problems … think I needed to replace some o rings years ago. It’s lightly used as its size for a daily driver is ridiculous and it’s currently at 87k miles.

my biggest worry with this diesel is further encroaching of B20 fuel. I unfortunately need to drive through corn belt on occasion

since I’ve made 15 years, I’ve replaced the gold G05 coolant with blue G48, so now both Mercs the same.

 

@mabab you need to clearly understand - the posters talking about 2007 CDI diesels have a different engine/emissions arrangement than the newer Bluetec which uses DEF fluid or "AdBlue", a solution of urea and (mostly) water.

AdBlue Bluetech vehicles are garbage. CDI diesels seem somewhat more reliable.

Gone are the days of the 1980s Mercedes diesels good for 300k miles and more. They do not exist.

 

WIS/EPC are included in my membership
no need to buy that from chinese scammers

 

just for update:
they found the problem, defected rear sam regarding water intrusion to it . the problem is a defective right tail light sealing and tail gasket!

 

Good find. I realized I said "rear LEFT" above - that's the wrong side. Sorry for the confusion.