CM2250 no boost in top gears

[hct5]

I have been having issues with our 2012 KW W900. It was demandated a couple of years ago and has been running grear with no issues. we installed a new trubo around 5 months ago and had no issues till about one month ago. the truck will run great for say 8 hours and then in the top gears 12/13 the boost drops to 0. sometimes he can drop a gear and it kicks back in and everything works great. i found the CAC leaking so i replaced that and it still has the same issue. new air filters. no leaks in the charge air system. cleaned the imap sensor. new exhuast pressure sensor and i also cleaned those tubes out. no exhaust blockages. just not sure where to go from here.

[mikkhh]

Pull the programming file from ecm and have it looked at as a first step...

[Rawze]

like others have said...

Copy the program from the ecm and e-mail it to me for a proper review of what someone did in there.

For all anyone knows,.. the issue might be right in your face.. but some idiot might have blocked/hidden the fault(s) from showing up in the dash that would otherwise tell you what is actually wrong.

info on copying the program out: https://rawze.com/forums/showthread.php?...5#pid72945

[hct5]

thanks for the info, im working on finding that software now. the truck just got back and i hooked insite up to see if any codes had come up and it had 64 counts for code 2973 and 4 counts for code 2346. i did both the troubleshooting trees and found nothing wrong.

[hct5]

alright so 1600 rpm it has o boost and the turbo rmp is at 35883. then it will randomly jump up to 68000 and the unit will have 10psi of boost. i have the exhaust and intake off the turbo.

[Rawze]

(06-05-2025 )hct5 Wrote:  alright so 1600 rpm it has o boost and the turbo rmp is at 35883. then it will randomly jump up to 68000 and the unit will have 10psi of boost. i have the exhaust and intake off the turbo.

Maybe do a turbo inspection and re-calibration while your at it?.'
ref: https://rawze.com/forums/showthread.php?...18#pid1618

[Rawze]

(06-03-2025 )hct5 Wrote:  I have been having issues with our 2012 KW W900. It was demandated a couple of years ago ...

I am reviewing the program that was sent to me for your truck. Here is what I see with it...


Here is what I see when reviewing this program... Its bad,.. its REALLY BAD!!!.

== first and foremost, according to the engine ser#, the program that you sent to me does not belong to this engine at all, It is not even close!.
= == The compression ratio is all wrong in the program.
= == The Injector settings and sizes are all wrong.
= == The fuel pressures, injection timing, fuel-air-mix, and everything else is all wrong.

It does not match the internal engine n hardware whatsoever!. Whoever tried to turn u the HP by shoving THE WRONG PROGRAM INTO THE ECM.. was completely CLUELESS!.

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NEXT: The base cummins program is also several years out of date. ... Like before 2015 kind of old!. This things is in dire need of a software update.

These issues alone warrant the thing needs to be completely updated, the right program put back in according to the engine ser#., and any de-mandate re-done from scratch.

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The delete programming itself...

== The Injector on-time has been screwed with heavily to try to fool the ecm into giving up more fuel than it knows about. This is bad.. VERY bad, as it destroys all cylinder balancing data + the ecm will fight against the unknown added power, assuming it is leaky injectors. It also fools the dash into showing higher fuel mileage than its actually getting, as the ecm can no longer account for the fuel properly. It is also harmful to the cylinders over time due to excessive friction and eventual liner fretting.

== There has been is no engine operating mode control re-mapping done whatsoever. This is VERY harmful, as the engine will perpetually make extra heat and friction internally in attempts to warm up the missing DOC/DPF/SCR systems, resulting in excessive turbocharger over-spooling and engine wear. The result is progressive damage inside the engine via premature head gasket failure due to fretted liners. This is before even adding any power/torque.

== Instead of shutting things off properly, an excessive use of blocking fault codes, hiding them from the dash only has been done. = This is problematic and can make troubleshooting of actual issues very difficult. The engine will have many faults that can no longer bees seen, yet be active. This often results in a mechanic chasing their tail for ghost issues that there are no faults showing for, replacing expensive engine performance components to no avail.

== The egr gas combustion offset logic has not been switched off. This is moderately Harmful, and leads to shortened engine life dut to excessive cylinder-wall friction.

== The Auxiliary emissions systems (they activate as a penalty when the main emissions systems are de-activated), for NOX control, Ammonia control, etc. - All offsets have not been fully/properly switched off. this results in Ghost Efficiency loss, ghost power problems, Ghost derates, and is slightly-to-moderately harmful to the engine. It is also common for someone to also try to jack up the power settings for the engine in attempts to cover up this issue.

== injection timing, fuel-air-mix, and other combustion processes have all been left to factory EGR+ settings. This is VERY harmful, it shortens engine life by as much as half once the EGR gas is taken away, especially at higher power levels. In your case, with the enigne mostly stuck in its primary EGR+ mode (due to improper mode control editing), what is typically seem is that accelerated valve seat wear sets in, and eventually cylinder head failure occurs after a couple tears depending on how hard the engine is driven.

== Someone has completely destroyed the power torque curve for the engine. The power/torque curve has been completely destroyed. It has been set to an engine killing 1000+HP, and 2500+ ft.lbs torque. I guess someone wants to completely destroy this engine rapidly. It was also done incorrectly and in the most harmful ways possible.

Looks like a kindergartner made this complete trash!!...

(right click, view image to see larger image).
== Engine brake settings have been altered, and done so incorrectly. This can be VERY harmful to the engine and puts it at extreme risk of a piston striking a valve (destroying the entire engine with zero warning) under high engine brake loads, at higher RPM ranges.

== The turbocharger has been re-reprogrammed improperly. It is set to over spool like mad and choke the exhaust of proper power levels. This eventually causes head gasket and/or turbocharger failures to occur.

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The engine will have to be flashed back to its factory programming and the de-mandate made from scratch again for it too be fixed.

The ECM needs to be updated/flashed with the latest factory software first before continuing.

** Back up all vehicle settings (in insite by making a work order + ecm template + ecm image). This backup using Insite will have all the vehicle-specific settings in it that are otherwise hard to get back if lost.

** flash ecm to its latest base factory software according to the engine ser#.

** Restore the work order/template (vehicle-specific settings) that was made in Insite before the re-flash, so that the engine knows the addresses of all the buttons in the dash are, etc..

** Clear all faults 2x in a row, cycling the keyswitch, and then Run engine for 10 minutes on new factory software to rebuild data. It does not matter if it has some emissions systems faults that do not go away at this point.

** copy the clean updated file back out via CT and e-mail it to me to have it re-done properly.