exkalibur Posted September 27, 2019 Share Posted September 27, 2019 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 Quote Link to comment Share on other sites More sharing options...
Kevinfaudoa Posted February 28, 2020 Share Posted February 28, 2020 I got the same code and we ended up just hitting the def pump with a hammer and cycled the key on and off a few times. No more codes and the engine is no longer derated. Quote Link to comment Share on other sites More sharing options...
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