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Service DEF system : See Dealer

38K views 16 replies 7 participants last post by  chadg2 
#1 ·
I just had my DEF injector line replaced from the rear tank to the injector. Dealer did Shifter Recall & Cat replacement at the same time. After driving 5-10 miles from the dealership I got a cel light & Service DEF : see dealer message on the dash screen. Is it possible to just have trapped air in that long line from the tank? Is there anyway to reset the Service DEF message? I got the light out with Torque app and it had P20E9 powertrain code present. Can't get the Service DEF message to go out. Thanks.
 
#2 · (Edited)
Is there anyway to reset the Service DEF message? I got the light out with Torque app and it had P20E9 powertrain code present. Can't get the Service DEF message to go out.
Eh. I had that pop up randomly one day (Service DEF / P20E9 & P204F). Here's the deal: the EPA forced some DTC's to be special so that they can't be cleared by a regular tool. You can see the code remains listed in Torque if you scan it again now, correct?

How surprised are you about this, given that the EPA also coerced FCA through regulations to include "inducement" code in your vehicle firmware to make your vehicle disable itself if the DEF / SCR system is unhappy? You are allowed to drive your vehicle only by the grace of your EPA overlords. Well, that is unless you decide to defy their tyranny and take a stand for freedom by running a GDE tune. FWIW, I'm pretty sure I read that the Rebel Alliance loaded GDE tunes in all their fighters when they took on the EPA Death Star in Episode VI.

Anyway, if your issue was transient, as mine was, then now you've cleared the DTC and the problem hasn't immediately recurred. So, the "Service DEF" message pops up, but no CEL is on. If so, then all you need to do is drive around a bit. If my hazy memory serves, the vehicle will be convinced the problem is gone if it hasnt recurred after three engine restarts plus some minimal driving (I think I drove about 20 miles). At that point the historical DTC regarding the DEF will no longer be visible in Torque, no "Service DEF" message will display in EVIC, and your EPA masters will allow you to continue to drive your vehicle... for now.
 
#3 · (Edited)
I pulled off the skid plate in back and removed the line to the injector. Started the truck and not a drip of DEF fluid comes out while the truck is running. Does this line pressurize when vehicle starts or when does DEF fluid flow to the injector from the tank? Gauge at dash shows 1/4 DEF. When I pound on tank it sounds empty.
 
#7 ·
If the dealer did drain and drop the tank as netboy suggested, and then didn't at least partially refill the tank, it means they also could not have properly primed and bleed the injector pump and line. This would explain the code.
I find it unconscionable that a factory authorized service facility would short cut the procedures to this extent. Even at the owner's request to not add DEF. But then, guess it wouldn't surprise me.


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#8 · (Edited)
From looking under the vehicle it doesn't look like they had to drop the tank. I can reach the entire line without any obstructed areas. I emailed GDE and they think the dealership forgot to reset the learned pump pressure from when the line was leaking(low pressure). Now that the new line is on without any leaks, the computer thinks the pressure is too high. I'm going to call the dealership on Monday. Thanks.
 
#9 · (Edited)
Not sure if responding to this thread jinxed my JGC :(, but a few days ago I got the same "Service DEF system : See Dealer". Pulled DTC's and I've had a current, pending and permanent P20E9 (Reductant Pressure High). Searching the web suggested a clogged injector so I decided to pull the injector and see what's the story. See the pics to understand the shock I was in when I got the injector off the SCR. The one on the left is the mount on the SCR, and the one on the right is the injector face. As you can see the DEF calcification (the white stuff) is so bad that it literally blocks the injector. This stuff is hard as a rock. I've used a few tools to remove the large pieces and finished the job with a steam cleaner that is very efficient in removing this stuff. I then put everything back together, re-installed DOM's plate, cleared the DTC and took her for a driving cycle. Once all the emissions readiness monitors turned green, the permanent DTC cleared out. I've had my SCR replaced about 20K miles ago which suggests this cleanup should be done every oil change. a real good source of information for this job is Shawn Capson's (R.I.P.) video: DEF Injector Maintenance.
 

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#10 ·
Not sure if responding to this thread jinxed my JGC :(, but a few days ago I got the same "Service DEF system : See Dealer". Pulled DTC's and I've had a current, pending and permanent P20E9 (Reductant Pressure High). Searching the web suggested a clogged injector so I decided to pull the injector and see what's the story.
What are your typical driving patterns? Anecdotal evidence typically points to lots of idling and/or city driving for clogged DEF injectors.

Are you getting 10K miles or more out of a tank of DEF?

I'm trying to decide if I should be doing this as part of my routine maintenance. I typically get 11K miles out of a tank of DEF before the low DEF warning comes on, so my doses are pretty low overall.
 
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