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Old 12-20-2018, 06:32 PM   #1
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2017 Seneca Malfunction Indicator Light Illuminated

Ok Geniuses,

Getting the 2017 Seneca with the ISB6.7 ready for Christmas trip today. After filling the DEF tank from a sealed bottle, I started the engine to check systems. Immediately noticed the Amber Engine symbol was illuminated on the tach.

Engine manual says it is called the Malfunction Indicator Light. From the description it says service should be scheduled, but it didn't sound like it is imperative.

Checking the scan gauge, it shows code 3031. I cleared the code, and in a short period of time it returned.

Web search indicated that it has to do with the DEF system. However, when I spoke with Cummins I was told it was a No.2 cylinder injector issue. Seemed odd because the engine is purring.

Have any of you had this issue?

Thanks
Merry Christmas and a Joyous New Year!!
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Old 12-20-2018, 06:40 PM   #2
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Another owner reported the same code his reply was:In my case it wasn't the sensor it was the check valve that keeps the DEF from returning to tank. They replaced the temp sensor once to no avail but once they replaced the check valve it never came back.
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Old 12-21-2018, 06:25 AM   #3
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Check out this thread on a different forum. It's got some good info on this code.


Spn 3031 fmi 2 - iRV2 Forums
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Old 12-21-2018, 07:34 AM   #4
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I spoke with Cummins support last evening. The tech did a bit of research, asked what the outside temperature was, and if I had recently refilled the DEF.

He explained that this is a normal indication when the DEF temp sensor reads below 50. When the DEF heater gets the temp up above 50, the MIL will extinguish.
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Old 12-21-2018, 07:44 AM   #5
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Quote:
Originally Posted by ChuckW View Post
I spoke with Cummins support last evening. The tech did a bit of research, asked what the outside temperature was, and if I had recently refilled the DEF.

He explained that this is a normal indication when the DEF temp sensor reads below 50. When the DEF heater gets the temp up above 50, the MIL will extinguish.
So in this situation, when the DEF temp is 50 or below, the MIL is normal? My DEF has been much lower than 50 degrees and I never got the light. Also, in the link i sent earlier, one post deals with a heater that got the DEF too warm and caused a MIL.
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