Join Date: Mar 2016
Location: Dodge City, Kansas
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Actually, not having any interest in working on my vehicles is why I joined this site. I have a P20BA Heater "A" control circuit performance code on my 2011 gen1 6.7.
OK, here's what happened, I never do this, but this time I did. I let the DEF get low enough I got the 800 mile alarm. So I put 2.5 gallons in (DEF at the pump not many places in and around Dodge City yet). The level was fine for about 3 days (300 miles max). I checked the DEF level and it said under half. Got another 2.5 gallons and could not put it all in. About 1/3 of the jug would not go in the tank cause it was full.
Now, all the while this is going on and for probably 2 months now, I have been having issues with the coolant. It's going somewhere but????????? Sometimes if I forget to check it, I'll notice it's, shall we say, low cause the cab heater don't get even warm. Thing is the motor temp stays right where it always does. Never overheated.
Recently the coolant issue got worse. I can usually fill it up with an unmixed gallan which adds 2 I know but usually don't use it all. Today, I added right at 4 gallons.
Back to the code - It's only been active for the last 3-4 days.
I guess what I'm asking is do the 2 things have anything to do with each other... or will one cause or effect the other.
OK I'm asking did I screw up the heater in my DEF tank by procrastinating on the coolant issue?