mchan68 Posted April 12, 2014 Share Posted April 12, 2014 I have one here, that after replacing the reductant pump for a heater code P20E8 set almost right away. Ordered another pump. Since this pump was on a back order, the customer took his truck. Came back yesterday. Service replaced the pump, followed PPT 'RK' to the tee. Prior to service replacing the pump, the dosing test would not inject. After service replacing the pump, I managed to complete the test. Road tested and the code didn't return...... until the customer picked it up. Came back yesterday, so I did and SCR parameter reset and cleared it. The customer called shortly after to inform me the Check Engine light came back on. This vehicle has a maintenance plan so it only gets its DEF topped up during every service. Anyone else run into something similar? Quote Link to comment Share on other sites More sharing options...
DieselD Posted April 14, 2014 Share Posted April 14, 2014 Yes I had something like this on a early build 11MY however it was very intermittent to the point of thinking the pumps where fixing it. Ended up finding a loose pin at the GPCM connecor if I remember correctly Quote Link to comment Share on other sites More sharing options...
Fordracer Posted April 14, 2014 Share Posted April 14, 2014 I had one doing the same thing. The light wouldn't come on right away and when running the dosing test it wouldn't build pressure with the new pump. The hotline told me to replace the sender and that fixed it. Quote Link to comment Share on other sites More sharing options...
batmantech Posted April 14, 2014 Share Posted April 14, 2014 Did one where it passed the dosing test, new sender fixed it. Got another one in the now waiting for the sender, wiring seemed ok we will see I guess Quote Link to comment Share on other sites More sharing options...
mchan68 Posted April 14, 2014 Author Share Posted April 14, 2014 Thanks guys. I guess I will have to wait for the truck to return to try it out. Quote Link to comment Share on other sites More sharing options...
That Guy Posted April 29, 2014 Share Posted April 29, 2014 Check for a restriction in the line between the pump and injector, had one that kept coming back found line clogged. Quote Link to comment Share on other sites More sharing options...
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