Check engine light, but no codes. What gives?

[andytall23]

Well, I've got a deleted 2017 ram 2500 Cummins with 27k miles. Ive had zero issues related to the delete and the trucks runs great but Igot a check engine light about 3K miles ago for low coolant as read though my CTS2. Ive heard this is a fairly common problem within the 25-30k mile range. I topped the coolant off, didn’t clear the light. Ordered a new coolant level sensor and installed a couple days ago, still didn’t clear the light and the P2560 was still there. Just checked codes with my cts2 and its showing no codes, which I guess is a good thing as Im hoping the level sensor fixed it, but my check engine light is still on. Does the take a couple cycles to clear?

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[TexNeck]

Not for sure on this one but I bet it will take a couple cycles to clear. I have had some minor things where the truck just needed to have the ECM read the issue had been resolved.

Its 3 on/run/off to clear if I remember mine right

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[andytall23]

That's what I'm hoping for. I appreciate the response.

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[Polaraco]

Well, I've got a deleted 2017 ram 2500 Cummins with 27k miles. Ive had zero issues related to the delete and the trucks runs great but Igot a check engine light about 3K miles ago for low coolant as read though my CTS2. Ive heard this is a fairly common problem within the 25-30k mile range. I topped the coolant off, didn’t clear the light. Ordered a new coolant level sensor and installed a couple days ago, still didn’t clear the light and the P2560 was still there. Just checked codes with my cts2 and its showing no codes, which I guess is a good thing as Im hoping the level sensor fixed it, but my check engine light is still on. Does the take a couple cycles to clear?

Usually the best way is to get a pro scanner on it. I have one on my laptop that goes much deeper than those tune boxes. Autoenginuity. You'd be surprised. Sometimes there are codes and no check engine light. I've used it quite a bit. A good hand held may work too. Not a $19.95 one. I bought a $100 one for the ABS. But the lap does the same job. Problem is, it gives you too much info sometimes. I wanted a quick reference scanner. The MM3 didn't give me any codes, because in this case it was an ABS issue.

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[andytall23]

Usually the best way is to get a pro scanner on it. I have one on my laptop that goes much deeper than those tune boxes. Autoenginuity. You'd be surprised. Sometimes there are codes and no check engine light. I've used it quite a bit. A good hand held may work too. Not a $19.95 one. I bought a $100 one for the ABS. But the lap does the same job. Problem is, it gives you too much info sometimes. I wanted a quick reference scanner. The MM3 didn't give me any codes, because in this case it was an ABS issue.

Makes sense. I plugged in my EFI auto cal and that yielded zero DTC’s. I may take it to the local diesel shop and see if they can read it. I need to get my tranny flushed anyway.


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