Reductant is the fancy name for diesel exhaust fluid.

(it's used to reduce the NOx)

 

Okay expected as much as the term tank was in the code but with the temp being in the 50's how could that apply. Did do some more searching on this site and found reference to low pressure at the injectors, as in injector (fuel) problems. This makes it even more confusing as we are addressing two totally unrelated systems. HUH?
Randy

 

Huh?

P2058 Reductant Injector Circ High Bank2 Unit 2

Which means the DEF injector performance is off.

Where you draw the conclusion to fuel, I have no idea.

This link helps to understand the system a bit.
Duramax Diesel Exhaust System Fluid Injectors - GM Techlink
Although it doesn't detail a P2058.

This may be the same
Duramax Diesel Exhaust System Fluid Injectors - TechConnect Online News Blog

I suppose that description means the injector has changed resistance values, indicative of compromised wiring, or a partially shorted coil in the injector. An open or dead short would result in a different code.

 

P2058 Opps P205B My Bad

Huh?

P2058 Reductant Injector Circ High Bank2 Unit 2

Which means the DEF injector performance is off.

Where you draw the conclusion to fuel, I have no idea.

This link helps to understand the system a bit.
Duramax Diesel Exhaust System Fluid Injectors - GM Techlink
Although it doesn't detail a P2058.

This may be the same
Duramax Diesel Exhaust System Fluid Injectors - TechConnect Online News Blog

I suppose that description means the injector has changed resistance values, indicative of compromised wiring, or a partially shorted coil in the injector. An open or dead short would result in a different code.

Yeah, my bad; Jumped to the wrong conclusion not taking into consideration that these vehicles have at least 10 injectors. Now to add insult to injury I hooked up the scanner again and find that I didn't even read the code correctly, instead of P2058 it is actually P205B; 8"s and B's a lot alike with my poor eyesight. Anyway I guess that means that the tank sensor is bad and is not activating the heater? It does have a heater, no?
Thanks for the input
Randy

 

I would be happy to do further research on your concern. Could you please private message me your name, address, phone number, VIN, and current mileage?

Thank you,

Jessica L.
GM Customer Care

 

Could be a connector issue.

Yes, the tank has a heater. But if the code is for temperature sensor performance, it's likely the sensor or the wiring.

FWIW, def freezes at 11*F. It doesn't hurt it to freeze and thaw. (that's one of the reasons they selected the 32% concentration)

 

Just got back from the dealership to set up an appointment for the service. They said the entire tank assembly will have to be replaced which is not just an easy in and out in a couple of hours kind of thing. Seems hard to believe that they can't just replace what is defective; also seems that GM is costing themselves a lot of money with that way of doing things. Am I missing something here? I'd bet that the manufacturers are just as sick of our whole EPA big brother thing as the consumers are. Sqrew-em! No I'm mistaken they've already sqrewed us and our trucks.
Randy

 

Yesterday the check engine light went off, I had not canceled it as I wanted it still on when I go to the dealership next Monday. Guess it just went off with some number of start cycles. Anyway I hooked up the scan tool to be sure it was still showing in the history; it was but it now also shows the P2061 which is reductant injector air pump ckt high. Are the P205B and P2061 related? Also what is the air pump for (?), I didn't know that there was an air pump in the system. Did I just wrongly assume that there was a fluid pump for the injection into the exhaust? Lastly, what is the general consensus of this forum on the life of the emissions systems on these trucks? Is it a safe assumption that owners are going to be faced with continual emission system expenses after the warranties have expired? This will be the fourth emission failure on this truck and it has less than 25,000 miles on it.
Randy

 

I've done every kind of search I can think of and still can't find out what the reductant air pump does. Anyone?

 

I dunno where you got "air"? The reductant pump sprays the urea.

 

I dunno where you got "air"? The reductant pump sprays the urea.

You might want to look at the P2061 code; it is "reductant injection air pump ckt high". Hence the question what is the reductant air pump, what does it do etc., and also the earlier post 'thought that the fluid was pumped'. You must not have read completely before your post.
Randy

 

Maybe there's an air pump to purge the reductant lines at shut down (so they don't freeze).

 

Looking here (3/4s of the way down)
2011 Duramax LML. Built to Tow.
I see just a pump, no "air" anything.

GM fit that code to the reductant pump, and, it does not use or pump air. Surprisingly, the internet is WRONG. At this time, I cannot find a valid source to back me up, BUT, I am certain the definition on a Duramax will not include the word "air".

If you have a Sprinter van, the P2061 definition is different, ie P2061 Engine Oil Sensor Open Circuit

 

That would make sense, but codes with high and low pressure would seem to invalidate that assumption. I think no one understands these systems.

 

Does the code say 'pressure' or just hi and low (might refer to voltage, as in a device test)

 

Let's go with the Dodge definitions
P2061 Reductant Injector Circ/Open Bank2 Unit 2 (there is no bank one or unit one, 2 is chosen because it's on the passenger side, like O2 sensors are numbered)

P205B Reductant Tank Temperature Sensor Circuit Range/Performance

So..... you've probably got a harness rubbed through, or a connector corroded, or a failed electronics module upon the tank top.

 

Looks like no user serviceable parts (as far as buying individual components)

 

I had a reoccurring P0205B, took it to Three Way Chev in Bakersfield, got there at 7, diagnosed by 8, had new complete DEF tank unit in stock, installed , and back on the road by 11:30.
Haven't had a problem since...

 

Thanks for the picture Brian, and yes according to the dealer they always just replace the whole assembly as no replacement parts are available. Also that's why I mentioned in an earlier post that it seems like GM is wasting a lot of money by doing that.

 

Brian
Looking at the schematic you sent again I now see why the fill tube burps so bad if you don't add DEF very slowly. The vent tube #'s 19 and 24 exit at the fill tube mouth so if you fill fast the fluid also gets in the vent and is then burped out when the air has to escape. Makes me wonder if I can put a little extension on it the next time I fill or maybe use a funnel that goes a ways down the fill tube but doesn't block the vent, we'll see. Hate the fact that it takes so long to add 2 1/2 gallons.

 

Mine takes it as fast as I can pour from one of the 2.5 gallon cubes, using the supplied flex spout.

First time it gurgles is when it's approaching full and time to stop.

 

Mine too.

 

Not mine. Takes at lease 8 minutes to put in a 2 1/2, any faster and it burps and you've got a lot of white splatters every where to clean up. I remember when I picked up the truck new, got home and opened the hood to find the whole engine compartment covered with the white crust. At that time I didn't know about the urea when it dried. Seems the guy that filled the tank didn't either; you might not know the extent of the splatter until it dries. Maybe my vent has always been clogged?

 

seems possible

 

Lucky

 

Well gentlemen I have read every post on this emission crap and I was thinking how lucky i was that I didn't have any issues, until this morning. My truck is a 2012 with 21000km and is completely stock.
Its cold here in Alberta -31c with the windshield temp of -41, remote started my truck and it shut down after 3 minutes, tried again "nothing"
did the manual start and DIC says 282km until 105 km/h max speed, service emission system, I have the Edge insight monitor CEL its throwing is P204B Reductant pressure sensor range/performance.
Also there is a large puddle of coolant under the truck.

Has anyone experienced this ?

I cleared the CEL with the Edge, so i can at least remote start the truck, does the ECM hold the codes so that dealer can trouble shoot the issue?

Truck goes in Tuesday morning

 

Up-date
DEF tank was frozen solid so dealer has to thaw the tank and then do trouble shooting tomorrow.
I cleared the CEL and dealer could not get the code, got the finger waggle for that lol

 

They should be able to see it

 

Got a call from service that the truck was fixed and that they had replaced the tank assembly. He also mentioned that the P2061 I gave them was not a valid code. I'm curious if that is true? If the P2061 is not a code for this truck why would my scanner pick it up?
Randy