Hello all, I have a 2010 ML350 Bluetec and I just got a CEL-p20bd (Reductant Heater"b" control circuit open")... I was in Vermont this morning and the temperature was 1F and I got the cel as soon as i started the car. what do you think this is?
I just did a reset with the little scanner since driving back home to NY the code didn't get erased. so I deleted the code after driving for 5 hours. I just hope it doesn't come back on.

 

I found this
P20BD rotate angle error between left cylinder bank camshaft and crankshaft (P0378)



Your code seems to be for a Ford.

 

That sounds complicated and headache. Just hoping the light doesn't show up again but since I have the cpo warrenty i hope everything breaks b4 the warrenty expires

 

Sounds like typical cam magnet problem (Just a wild guess)


Don't clear codes if you have a CPO warranty, get everything you can fixed.

 

Did you ever figure this out? My 2010 just popped this code

 

I just got the same code, did you ever figure this out?

 

Just got this code to for my 2010 GL350; Of course, my cpo warranty expired two months ago.

 

If you have a Blutec its the Addblue tankheater gone bad. Could be faulty wire lose connection or in most cases replacing.

 

I just got a CEL-p20bd (Reductant Heater"b" control circuit open").any suggestions

 

More than likely a bad heater, only fix is to replace

 

I have similar problems as well. My check engine light is throwing 3 codes:
P2069: Reduction heater 'A' control circuit open
P2005: Intake manifold runner ctrl stuck open bank 2
P2413: Exhaust gas recirculation sys perf
I reset the codes, they come back right away. So booked a service appointment next week. Will let you guys know the outcome, but my psychic powers tell me this is a 4 digit fix $,$$$.