Code P20B8...again?
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Junior Member
Joined: Dec 2009
Posts: 54
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Nothing special yet
Code P20B8...again?
So I purchased my 2012 R350 in August with a check engine light on (MB Dealer auction with 68,000 kms) When I got it my dealer told me it was the buletec heater. I changed that and was good for about 3 month, then another check engine light. This time is was P20B8 and was told by Mercedes that it was now the bluetec pump. So I had it changed (not from MB) and 1 month later same code? What could this be? I am stumped and so is the guy who replaced both Heater and pump. Any suggestions.
Thanks
Thanks
Thread Starter
Junior Member
Joined: Dec 2009
Posts: 54
Likes: 2
Nothing special yet
Sorry to bump and old thread, but the code came back! I have changed the bluetec heather and pump, so what is left!!! So frustrating that I can't fix this problem. Any suggestions?
Thanks
Thanks
Junior Member
Joined: Dec 2014
Posts: 17
Likes: 1
2003 C320
Hey, did you ever get this figured out? My 2012 R350 BT is doing the same thing all of the sudden. The AdBlue warning is on; countdown of starts initiated. I took it to the dealership today, and they looked like a deer in the headlights! They made an appointment for later, because "this is never simple". Yikes...get me out of this Mercedes!
Newbie
Joined: Mar 2018
Posts: 1
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Audi A8
Have one in the shop with limit counter at 0 starts remaining. Can’t reset counter with scanner. Module seems to be in a locked mode . Adblue problem . As soon as i find out what the fix is for this 2112 R350, i will post it. If anyone has questions or needs advice i will be happy to assist anyone who needs help. And if anyone has any info on my problem send info. Thanks
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Newbie
Joined: Jan 2018
Posts: 13
Likes: 0
From: Providence Ky
2009 Mercedes Benz GL 320 Bluetec
Rattlebox
Have you changed the ad blue level sensor? and did you use a MB heating element when you changed the heater in the tank?
I replaced my heater level sensor and pump. I used an XEmodex heating element system and it has worked flawlessly. I did it myself at my Independant repair shop I own and operate and it took about 3hrs total including answering the telephone 14 fricking times.......
I replaced my heater level sensor and pump. I used an XEmodex heating element system and it has worked flawlessly. I did it myself at my Independant repair shop I own and operate and it took about 3hrs total including answering the telephone 14 fricking times.......
Last edited by Rattlebox; Mar 24, 2018 at 10:33 AM. Reason: additional info
Thread Starter
Junior Member
Joined: Dec 2009
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I dont know. I will ask the mechanic who performed the job. Funny enough the light went off this morning, so I will wait until ot comes back on. Thats whats making me think it might be an electrical issue.
