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| Hi. 1569.31 is a derate code preceded by your EGR code.
2791.07 means EGR valve did not reach the expected position. The ECM commands EGR into a certain position and when the egr actuator doesn't respond or doesn't adjust the valve to the desired position it will throw this code and derate the engine. If it's not a harness/wiring problem then most likely the actuator is failing or the valve itself is getting stuck. A snapshot of the actual vs desired position when the code was thrown will help tell the tale. EGR is a common problem. Replacing the valve will most likely be the fastest fix until it happens again.
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JD 9770 Combine codes
