Problem with adblue heater or pump
Thread Starter
Junior Member
Joined: Dec 2017
Posts: 16
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Mercedes-Benz GLK350 4Matic and Mercedes-Benz ML350 BlueTEC
Problem with adblue heater or pump
Hello everyone,
My 2011 ML350 Bluetec has been displaying a check engine light intermittently for the past month. The code has appeared once after topping off the adblue tank and a second time after the vehicle had an A-Service done at Mercedes (adblue completely filled by service dept). The code that I have read is 20E821 FAULT: The pressure in the AdBlueregistered system is too low (I know it is not an MB code, but it is all I have!).
Is this code for the adblue pump or the heater? There is some information saying that it could be either according to my online research. Is the heater and the pump one unit?? Because I have already replaced the heater at the dealer and it has a warranty that is still valid.
Thanks
My 2011 ML350 Bluetec has been displaying a check engine light intermittently for the past month. The code has appeared once after topping off the adblue tank and a second time after the vehicle had an A-Service done at Mercedes (adblue completely filled by service dept). The code that I have read is 20E821 FAULT: The pressure in the AdBlueregistered system is too low (I know it is not an MB code, but it is all I have!).
Is this code for the adblue pump or the heater? There is some information saying that it could be either according to my online research. Is the heater and the pump one unit?? Because I have already replaced the heater at the dealer and it has a warranty that is still valid.
Thanks
Thread Starter
Junior Member
Joined: Dec 2017
Posts: 16
Likes: 0
Mercedes-Benz GLK350 4Matic and Mercedes-Benz ML350 BlueTEC
Just curious is the adblue pump and heater contained in one unit? Or are they separate? Thinking of maybe doing a DIY. The code I have (though not a valid MB code) only comes on in colder weather...
