SPN 641 FMI 9

[billharkey]

I keep getting the above error in my isx 2250 when starting. After I run about half an hour, I shut the truck off then restart and it goes away. 4 days in a row so far. I took to shop for diagnosis and they said it could be harness, actuator or ecm. I know the folks on here are pretty wise about engines.

Its a factory reman that i just had overhauled in december. Actuator was replaced in december also. I had a delete done to it while it was in shop. Been running great so far. I'm just worried it may go into derate if the light doesnt go off one time.

I thought of just replacing harness and see if that works. and take it from there.

Any ideas??? Thanx in advance