2011 Cummins ISX15 engine derated

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(03-01-2016 )joed2323 Wrote:  If you suspect this has happened, all you need to do is remove the yellow plug/harness from the bottom of def pump, when you do this fluid will run out of this harness plug location and you will know instantly that your def pump is junk!!!

My cel. came on yesterday and the engine derated in short order. Codes 3559, 2976 and 3572 along with the 3714 engine derate. Peterbilt said they could "maybe" get me in on Monday so I started troubleshooting and when I disconnected the harness from the def module def fluid came pouring out. Kinda glad I found the problem but $650 for a pump that should be under warranty but probably won't because I didn't have Pete do it is a bummer. This will be the last one I replace as well as anything else related to aftertreatment.