CUMMINS X15 FAULT CODE 125

What did you find wrong? I have the same problem on an ISX12

 

Register with Cummins Quickserve

 

I have both Quickserve and Insite. I Have gone through trouble shouting tree several times.

 

Have you pressure and smoke tested the charge air system?

What are the results of the air handling test with Insite?

 

Rawze dot com? Something about a bad ambient air sensor providing a faulty reference

 

I did a pressure but not smoke test. Good. Air handling test passed. Was barometric pressure sensor on the wire harness driver side of the engine. Was reading correctly on the code summary. That's why I was getting stumped.

 

Check IMAP sensor for correct part number per QSOL. I'm guess you already replaced with a new one?

Check Exhaust gas pressure sensor for rationality to atmospheric pressure. Biased sensors and plugged pressure tubes are common but usually throw codes related.

If your air handing test passes and your 125 still returns Id be getting ahold of Cummins support.

Do you have any software revisions that apply?

 

If the value is in range it won't throw a code. Doesn't mean the value is correct. You should see the value in an insite snapshot and compare to other pressure sensors at key on engine not running. They should all read the same. More or less. One might read ambient and another relative to ambient. Youtube Engine shop Joe has a video.