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Hi my name is Robert....
The engine light is the key, it can come on for many, many different reasons. To start I would check the oil, coolant levels make sure they are topped off to the proper levels. I also might change the fuel filters and see if that takes care of the issue, if you had a plugged fuel filter it could cause issues, if that is something you are going to do I would prefill the filters with clean diesel and then cycle the key about 4 times without starting as that will prime the fuel system. I would also check the battery voltage at the battery, make sure it is good, low voltage can cause issues with the engine electronics so it is good to verify the voltage and check your battery cables. Beyond that there could be dozens of reasons the light is coming on, when the light comes on it will store a code, a mobile service or shop that has the cummins software can hook up to the engine data port and see what faults are occurring, in the long run having the codes pulled will save time and money and take most of the guess work out of what is going on. IF you have a severe fault the engine will derate and you will have a loss of engine power.... Hope this helps some, IF you have more questions or concerns please feel free to contact me.... Robert
Was just checking in to see if my answer helped??? IF you have more questions or concerns please feel free to contact me... Robert