W166 2012 ML350 Bluetec - Error Code P20B9 Help please?

kdbarclay

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Oct 15, 2015
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Inverness, Highland, UK
Your Mercedes
ML/2012/350Bluetec
Hello

I have a 2012 ML350 Bluetec (w166) vehicle that has covered about 40k miles. The engine management light came on last week. The vehicle is now just out of warranty. I plugged OBD-II code reader in and found I have code P20B9 . Can anyone shed light on what this might be? the vehicle drives fine, one thing I have noticed is that she sometimes struggles to start. A generic search online shows that code in other cars is "reductant heater A control circuit/open" other general sites mention something to do with the AddBlue system heater?
Has anyone else experienced this code and can give some more info.

Many thanks

Kenny
 

television

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2002 SL500, 216 CL500, all fully loaded
Has the add blue message been up in the instrument cluster
 

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