![]() Once a regen is initiated the DOC inlet and DPF inlet need to reach about 525 -550 degrees. When running a regen you need to open up data monitor and watch all the exhaust temps and doser injector state. Also, is the DOC and DPF due for cleaning? It sounds like you have access to Insite. Cummins does have requirements to remove and clean the doser injectors because they do get plugged up rather easily. Weak metering actuators and warped diffuser plate in the turbo are common problems that get worse with hot engines versus warm or cold engines. I know it is easier said than done, sorry. This is where you need to reproduce the situation that is causing the fault. ![]() The reason for this is not always the same. Once the truck has sat for 8 hours and the regen retried it takes off and performs a perfect regen. I have had several regens fail with a fully hot engine and exhaust systems. You would have to try a regen with the truck freshly back from a long run and see what happens. It is quite common for us to follow the TS and perform a regen and everything is fine because we started with an engine that hasn't been running for hours and has cooled down. Most regen faults get logged after a failed regen, when the engine and everything else is right up to operating temp and has been there for hours. ![]() I see those temps all the time on successful regens. The temps you have listed probably will never cause a fault. ![]()
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