Po128 - Dodge Cummins Diesel Forum
2013-2018 General Discussion General Chit Chat About the 2013 model year differences 6.7L 4th generation Cummins - NO ADVERTISING -

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post #1 of 17 (permalink) Old 02-26-2020, 03:06 PM Thread Starter
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Po128

2018 2500 with 27,000 miles on it. I have noticed lately that it has not been getting up to normal op temp. Yesterday I had the CIL come on. Checked codes and PO128 came up, temp not getting to normal range. Going into the stealer on Friday. Anyone else have this and what was the issue.

Thanks.


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post #2 of 17 (permalink) Old 02-26-2020, 04:21 PM
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Could be a stuck t-stat, what is the temp reading in the EVIC?

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post #3 of 17 (permalink) Old 02-26-2020, 06:43 PM Thread Starter
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Usually in the 165 range sometimes hitting 175 briefly. Tstat is my first thought also.

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post #4 of 17 (permalink) Old 02-26-2020, 06:48 PM
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I believe the factory t-stat is a 190.

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post #5 of 17 (permalink) Old 02-26-2020, 06:59 PM
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Quote:
Originally Posted by pkwett94 View Post
Usually in the 165 range sometimes hitting 175 briefly. Tstat is my first thought also.
Yeah, that's way low, mine is always above 190.

Possible it is a bad temp sensor.

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post #6 of 17 (permalink) Old 02-26-2020, 07:34 PM Thread Starter
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Quote:
Originally Posted by Ltngdrvr View Post
Yeah, that's way low, mine is always above 190.

Possible it is a bad temp sensor.
Up until now mine as always ran above 190 also.

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post #7 of 17 (permalink) Old 02-28-2020, 06:27 AM Thread Starter
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The put a new Tstat in it. I pick it up today will see if it made a difference.

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post #8 of 17 (permalink) Old 02-28-2020, 07:29 AM
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Quote:
Originally Posted by pkwett94 View Post
2018 2500 with 27,000 miles on it. I have noticed lately that it has not been getting up to normal op temp. Yesterday I had the CIL come on. Checked codes and PO128 came up, temp not getting to normal range. Going into the stealer on Friday. Anyone else have this and what was the issue.

Thanks.
Put the thermostat in first. I seriously doubt the sensor is bad, and even then change the thermostat first.

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post #9 of 17 (permalink) Old 02-28-2020, 03:51 PM Thread Starter
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The drive home was 195 degrees
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post #10 of 17 (permalink) Old 02-28-2020, 04:01 PM
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The drive home was 195 degrees
Well, that's right on the money, so it looks like it was just the t-stat.

I do hit them right occasionally.

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post #11 of 17 (permalink) Old 02-29-2020, 08:36 AM Thread Starter
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Tstat was my first guess. All the electronics on these things came leave a person second guessing themselves though.

2005 CC LB 2WD with shift kit and billet TC, other then that stock.

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post #12 of 17 (permalink) Old 03-02-2020, 11:34 AM
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FWIW - Interesting - I had the same code and issues come up on my 2016 Jeep a few weeks ago. It was the thermostat being stuck open. The 2.4 engine has it buried and you can't replace just the stat. You have to replace the complete assembly, with sensor even. And it was a nightmare to replace. After some research, apparently on the 2.0/2.4 Jeep engines, it's a common failure in the 40 - 60k miles range...

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