Cummins X15 Codes

[Cookie Grosky]

BACKGROUNDThe issue can occur when idling (i.e., running engine at storage facility) but will come and go even when idling. The engine, at idle, does not rev or sputter, just has the light. The issue also occurs after highway travel and coming into town. When this happens, there is intermittent power loss while the light is illuminated such as stopping at a red light and then accelerating. Then, when the speed comes back up, it seems that the power loss is resolved and the check engine light goes off. There is no other gauge or indicator issues noted.

ANALYSIS: I cannot find a connection for diagnostic trouble codes, but I assume there must be something somewhere. Under the dash, there are two rocker switches (image attached). Neither one seems to do anything, but I think depressing the "Engine Check" switch may have reset the check engine light.

Thank you for the reply. I assumed as much for the idle speed rocker, but it does not seem to function. The way my rig achieves the idle up for warm up is using the blinker switch integrated cruise control. I would prefer the rocker switch, myself, and relocate it, but I would imagine that may be difficult. Still, these two switches seem to be down there for a reason, but ???.

Are the 2 switches even hooked up to anything? Can you remove them and see if they are wired? If they are, trace them out. I suspect a lose ground. I also think the check engine, would be a link to engine analysis. The other one is like Herman said.

Rich, I have none of what you just described but have a question that might help. In #2 "Hold the engine check switch down.". How long do you need to hold the switch after you turn the ignition key on?

Herman, You would hold the switch down until you have all the codes recorded / saved in the ECM. The Codes will repeat again and again as long as you hold down the key. The Idle speed key will go back one code,with each click so one can record them if needed..

OH, If you press the Idle speed switch - you can increasing the idle speed set point, but only to a max. RPM set in the ECM software or set the speed by using the throttle and pressing the cruse button as posted by the O.P.

I retired from Cummins 12 years ago. When a fault or problem occurs a code is created and the check engine light indicates there is a problem but is drivable with caution and get it checked as soon as you can.

The red stop engine light indicates a serious problem and should be shut down as soon as it is safe to do so. If a problem occurs momentarily the light comes on and goes out, A fault code is created and is stored in the ecm. it is called an inactive code and can not be accessed by the switches. It has to be read with a diagnostic tool. If the check engine light stays on it is an active code and can be read using the switches.

All codes are stored in the ecm until cleared with a diagnostic tool. The code is a numerical numbers called sids(sub system identifier) and pids (parameter identifier) these give the tech the info as to which system maybe the problem and causes, If the check engine light comes on and off at different times it keeps a count of how many times it happens. Just clearing or erasing the codes will not solve a problem.

Known good PCM is from a factory truck, remember this truck is deleted and the factory pcm should set circuit codes for all the missing pieces (EGTs EGR valve ect.) factory PCM only set codes for the missing EGT sensors but not the EGR.

TIPM is currently back ordered so installed a Fuse buddy to pull fused power off the fuse pins and ran a bypass wire down to the connector under the TIPM to get the truck back to the customer while we wait for the TIPM.

Don't be afraid of working on Deleted trucks - tampering with emissions is federally illegal and We don't do that, but we have customers that have either done their own work or found a shop to do it and need help with other issues. I got lost down a rabbit hole because I thought it was a software / delete problem. check powers and grounds.

Mike, I was not aware you could use a late model, is it just a flash update or is there something else to make it work? Could a newer (cheaper more available) TIPM be used with the proper flash? Thank you for your feedback and for sharing your knowledge. - Andrew

I went to a shop last week to look at this truck, two codes were in the PCM and would not clear. The shop diagnosed the truck with a bad particulate sensor. The sensor was replaced and the code did not come back. The 3712 and 3714 codes however would not clear, and the engine was in derate mode. Below you can see the conditions for clearing the code:

Conditions for Clearing the Fault Code This fault code will go inactive once all other active fault codes have been addressed. Refer to the appropriate fault code troubleshooting tree. The ECM will turn off the red STOP ENGINE lamp immediately after the diagnostic runs and passes.

Conditions for Clearing the Fault Code This fault code will go inactive once all other active fault codes have been addressed. Refer to the appropriate fault code troubleshooting tree. The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.

A regen and SCR test was performed post repair. All of the temps looked perfect and it passed all of the tests. The 3712 and 3714 still would not go away, there were absolutely no other codes. I have experienced this before, my simple minded explanation is that the codes are latched and there is a software issue. I decided to reflash the computer to the latest calibration. The codes were gone and everything was back to normal. If a reflash was not available, I would have still flashed the computer like an install and that would probably have the same effect. None of the calibrations cited this as an issue, so it was just a matter of uninstalling and reinstalling software, just like a PC or phone. I hope this helps someone out someday.

Matthew based on my experience after running the scr test the codes should go from active to inactive after an extended idle for a minute or two once it goes inactive then you can clear the codes. The scr test has to pass of course.

Cummins has had many different engines throughout the years and variations of the same model. For example, the Cummins ISX15 engine existed from 2010 model years through 2018. Depending on which year range, it could be a Cummins ISX15 CM2250 or a CM2350. The table below gives an overview of all the diesel-powered Cummins engines that has coverage on Diesel Repair for fault codes.

Depending on which tool you use to retrieve fault codes from your Cummins engine, you may either see the generic SPN & FMI codes or the actual Cummins OEM fault code. You can use Diesel Repair to find information on these fault code both ways.

If you use a lower-quality tool or an electronic logging device (ELD), you will likely get an SPN, SID, and FMI fault code. Even the higher-end, dealer-level tools will display this information, but they will also show the actual OEM fault code.

To publish a list of every fault code would only do a little good, but we have published the most popular Cummins fault codes for some of their more recent engines. Inside Diesel Repair, you can find quick repair information for each of these codes for free, and paid members can enjoy our step-by-step repair directions to get fixed even more quickly.

Cummins Fault Codes can be difficult to diagnose and repair, but we have you covered with Diesel Repair. Remember, the quick repair information is always free. Enhanced technical repair information can be purchased with subscriptions requiring no contracts and canceled at any time.

The Electronic Control Module (ECM) in the engine monitors all the readings constantly as the engine runs. If the values go over or drop under what is expected, then the ECM will log a fault code. There are three fault code statuses:

For example, the list of ISX fault codes without EGR prior to 2002 is a different list from the 2007 2010 ISX fault codes with DPF. For the former, the 111 fault code stands for Electronic Control Module. For the latter, 111 has a more specific error: ECM Critical Internal Failure.

These are some of the most common Cummins engine issues, but many other problems can crop up as well. The best way to keep any diesel engine in good shape is to follow recommended maintenance schedules to stay on top of preventative repairs and replacements.

Fuel filter intervals for the 24-valve are the same as the 6.7-liter, but 12-valve engines should have it replaced every 12,000 miles or 12 months, whichever comes first. These intervals remain unchanged even in severe operating conditions.

When it comes to repairing your heavy-duty Ford truck, Dodge truck or Chevy truck, ProSource Diesel has all the reliable and hard-to-find diesel truck parts and kits you need to keep your rig in good shape. We carry a wide range of parts for Powerstroke and Duramax parts as well.

The customer had some other codes that were active previously, and had already fixed the problem. However, the truck was still derated with the codes mentioned above and he wasn't sure how to fix it. The procedure:

Thank you, Tyler. Those two codes have turned a lot of my hairs grey! Where did you find that procedure? Here is something I posted in another forum a while back... just in case that doesn't work for someone.

A regen and SCR test was performed post repair. All of the temps looked perfect and it passed all of the tests. The 3712 and 3714 still would not go away, there were absolutely no other codes. I have experienced this before, my simple minded explanation is that the codes are latched and there is a software issue. I decided to reflash the computer to the latest calibration. The codes were gone and everything was back to normal. I have also reinstalled the same calibration on ECMs that do not have an update available with the same success."

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