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Need some guidance with an after-treatment fault: P110286


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Truck is a 2013 CHU613, MP8. 2010 emission and OBD 2013

Faults are: P20E892 reductant pressure too low or incorrect operation

                    P110286, reductant pump "A" control circuit electrical signal invalid.

Truck has the derating timer on when it comes in but faults are inactive. I followed the Tech tool diagnostic sequence and all tests good (only thing is I didn't use a load to test the grounds, just the Ohm meter).

These codes have come in randomly in the past couple of months. Always inactive when truck shows up and tests are all inconclusive. Should I concentrate on the ground side ?

Thanks

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