DEF sensor failure at 25K

[brillmtb]

Ok, def gauge went to zero yesterday. Restarted truck today working then to zero again with full Def tank. Drove straight to dealer to show them. scan showed low def fluid trigger and a def sensor issue that tech said was a bad sensor.

I then read that there may be some sensors that get clogged and can be removed and cleaned but is this the type I have in my 2017 3500?

Also, need to drive kids across a couple states to baseball tournament next week and was concerned that with gauge at zero and the little yellow light coming on that even if my countdown indicator not on yet that I would get stranded with the truck thinking I was out of DEF. Mechanic at shop said as long as full and flowing this would not happen but that would mean there is another type of sensor to tell the truck to shut down if you are following me and I am not so sure about that.

Does anyone know that if they cant replace sensor in time can I drive as long as fluid in the tank with a bad sensor without going into limp mode?

 

[Big Johann]

Does anyone know that if they cant replace sensor in time can I drive as long as fluid in the tank with a bad sensor without going into limp mode?[/QUOTE]

to the best of my knowledge if the ECM gets a low DEF signal, you are going into inducement mode and have about 150 miles of driving left.

If you took it to the dealer, why didn't they replace the sensor?

 

[brillmtb]

They scanned it but didn't have the part. They are ordering it now.

 

[brillmtb]

They tried to tell me that the sensor is just there to give the diver feedback when to refill but would not shut the truck down. That just doesn't sit well with me. Why have two systems, one to notify driver and one to tell truck to shut down

 

[Newsa]

www.trucktrend.com/how-to/expert-advice/1402-understanding-diesel-exhaust-fluid-basic-training/


"Currently, the only exception to this is the ’13-and-newer Ram HD trucks, which will continue to run and not de-rate power if the DEF tank should happen to run dry. This is allowed because the Cummins 6.7L engine tuning produces a low enough amount of NOx on its own, without the aid of SCR. "

Never tested this. But I think the dealer techs are correct that it won't derate. I think it would also have to detect high (illegal) levels of NOx