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The level sensors in my DEF tank have been slowly dying over the last year or so, so I finally figured it was time and got a tank on order. Of course as soon as I ordered it, they failed completely and the 300 mile until no restart countdown started. Then I found out that the tank had to be backordered and wouldn't arrive in time, so I had to come up with a work around. I remember reading somewhere (here I suspect) that the fix was as simple as touching a jumper wire across the starter relay with the ignition on. I located the relay, plugged a couple of wires into it (points 30 and 87 on the relay), using ring terminals for the tabs and ran it inside the truck to a pushbutton switch. I suspect the hood has to be closed before starting, unless you have the kill switch bypassed. Also, the pushbutton switch is a necessity, because otherwise the starter will keep cranking after the engine starts. The short is it worked great (no pun intended) and I can thumb my nose at the silly EPA requirement. :)





 

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I am with you on this, mine is dead too...waiting on the tank. The countdown happened yesterday and when I pulled into driveway no restart. Weird thing is my DEF gauge jumped up to full yesterday after going down slowly for 6 months. Still no restart though and still have P203E code.
 

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I am with you on this, mine is dead too...waiting on the tank. The countdown happened yesterday and when I pulled into driveway no restart. Weird thing is my DEF gauge jumped up to full yesterday after going down slowly for 6 months. Still no restart though and still have P203E code.
I believe you have to reset the code. I think you have to use a AffaOBD or go to dealer to do that. You can try a cheap code reader and it may work but I don't thin k so.
 

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I believe you have to reset the code. I think you have to use a AffaOBD or go to dealer to do that. You can try a cheap code reader and it may work but I don't thin k so.
Reset the code for DEF fluid/No restart? I have AlfaOBD, that can be done? I reset the code for P203E didnt help.
I'll check it out, anybody know where that might be....AlfaOBD has LOTS of codes. :)

Thanks for the tip.
 

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Reset the code for DEF fluid/No restart? I have AlfaOBD, that can be done? I reset the code for P203E didnt help.
I'll check it out, anybody know where that might be....AlfaOBD has LOTS of codes. :)

Thanks for the tip.
Bob, that was something I read somewhere. I have not had any experience with it. Hope you find it. I will look around and see if I can find it anywhere.
 

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I got it into the reset mode. It gives 50 miles on my truck. I noticed there is a SCR DEF fluid level reset in AlfaOBD. It says it is to be used if maintenance is performed on DEF tank. Tried it, but it says: "Failed. Values outside the allowable parameters...."

It is so weird, gauge shows full, but DEF light is on.
 
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