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I have a code on my 2012 sprinter P20bd I replaced the blue

Customer Question
Hi I have a...
Hi I have a code on my 2012 sprinter P20bd I replaced the blue deff heater still have same code wont clear
JA: Have you checked the coolant level? Has there been any leaking from the hoses?
Customer: why sould coolent leak give such code?
JA: Are you fixing your Sprinter yourself? What have you tried so far?
Customer: yes fixing my self took vehicle to local benz dealer they told me my adblue tank heating element is burned out
JA: Anything else you want the mechanic to know before I connect you?
Customer: I replaced the adblue heating element with a new one but still have same code p20bd
Submitted: 10 months ago.Category: Mercedes
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Customer reply replied 10 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Answered in 3 hours by:
2/3/2017
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 5,144
Experience: 15 years master certified 100% fix rate and have access to factory radio codes, wiring, and instructions.
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Hello, my name is***** and i will do my best to assist you.I am going over your story now and will reply back soon with some info,thanks!

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

What kind of scanner are you using to read/erase the codes , that may be part of the issue , let me know. Lou

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Customer reply replied 10 months ago
Autel scanner and also tried with snapon
Customer reply replied 10 months ago
Is it possible that it may need some sort of software update ?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago
Ok , I have a launch and a star and with the launch I can read adblue codes all day but cannot erase them , there is something about the adblue/scr module that will only allow the star to erase the codes , we had lots of issues with Hester codes and software updates but the code would have erased and came back after driving a few times , I firmly think the system needs to be read and erased with a star diagnosis. That will most likely fix you up providing you verified the heater and circuit are good .
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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

did you need any more follow up on this?

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Customer reply replied 10 months ago
I will let me try to connect everything and clear codes will get back to u soon
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

ok, sounds good.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

Any luck ?

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Customer reply replied 10 months ago
Nothing chasing wires
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

Anything I can assist with ?

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Customer reply replied 10 months ago
The SCR module under the seat can it short out to 1900 ohmes?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

What are you measuring that you are reading 1900ohms at

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Customer reply replied 10 months ago
Adblue tank wires from the tank forward
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

what is the vin of the sprinter . I will get you the wiring diagram from the adblue control unit to all the heaters and etc

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Customer reply replied 10 months ago
Thanks very much We got the wiring diagram already looking it too it right now will keep u posted of are findings
Customer reply replied 10 months ago
I think we have to perform software update to select the catalytic reduction SCR module there are bulletins to change the software in the control unit to change heater element fault tolerance
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

you are correct, but what is the date of the bulletins , because this was a huge issue when adblue was first introduced.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

those are not related to the adblue system.

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Customer reply replied 10 months ago
Took photo so u can see it's attached and white connector one pin looks burne
Customer reply replied 10 months ago
There is module under seat with part number A6429003301 we just disconnected and scanned no codes anymore what u think ?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

i see the burn now, weird, ,let me check that part number.

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Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

well, no codes because you unplugged the adblue control unit lol.

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Customer reply replied 10 months ago
Lou we're you able to find out anything else that can help me with this sprinter I think I have a problem with the
Exhaust Gas After Treatment Control Module part# ***** do you think ?
Mercedes Mechanic: Lou P. master tech, Mercedes Technician replied 10 months ago

well if the wires from the heater to the module are good and the heater is new then I would not replace anything else until you see if the codes can get erased with a mercedes scan tool. there are a lot of aftermarket scanners that will not be able to erase codes from the adblue module.

:(

so I would not do anything else until that is done first.

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Lou P. master tech
Lou P. master tech
Lou P. master tech, Mercedes Technician
Category: Mercedes
Satisfied Customers: 5,144
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