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Vehicle with P20B1 Faulty Code, described as “Reductant Heater Coolant Control Valve Circuit/Open”. Engine is temperature sometimes is over 212F. What could be the root cause? Stuck Thermostat? Thanks in advance.
Hi @lazarofernandes , Don’t know the answer but here’s the service manual for the vehicle that may help. Click on 2007-2014 Smart Fortwo Second Generation (W451) Service Manual to open the file. Go to p.39 to view a description of how the cooling system works. Hopefully this is of some help.
