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Old 07-13-2013, 06:33 AM   #1
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Stop engine light question

Had the dreaded stop engine light and alarm come on. I found I was just low on coolent. Added coolent and light went out. Now to my question, does the engine also derate when the stop engine light comes on? Mine did,so am wondering if I have another issue or does it derate every time the stop engine light comes on. Just in case, I did change fuel filters as well and will now test drive. Or should I also go to Cummins and have the codes read? Thanks for your thoughts.
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Old 07-13-2013, 09:43 AM   #2
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Yes they will go into derate. Mine was going into shut down (for different codes) and Cummins said it should not, the tech and I during the test drive had it happen so now they believe me. The tech from Cummins said they are only programmed for derate not shut down, by the tech.
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Old 07-14-2013, 10:29 AM   #3
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Tell the Tech to disable the derate on the ECM. If you get the light you should have sense enough to check it out. All a derate does is stick you on the side of the highway.
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Old 07-14-2013, 06:55 PM   #4
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In my case not the OP's my ECM was failing and he could not get it to respond. The hotter it got the worse it got. New ECM , reprogrammed , good to go.
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Old 07-24-2013, 10:52 AM   #5
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We were returning home on a short trip and I got the low coolant yellow light. Took the next off ramp to check it out and while exiting got the red stop dash light. Halfway up the ramp the engine shutdown. Was able to restart and drive a 1/2 mile to a truck stop to add coolant. I was surprised the coolant was low in a brand new MH. Do new engines normally go through coolant or should I be worried?
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