LMM ECM swap problems....no remote start

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Jan 27, 2008
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Ok, I helped a buddy do an ECM swap/DPF delete on his 08'. I put in a brand new ECM and did a full flash of his stock OS, now the remote start doesn't work. The tune is set properly, no CEL, so that's not the problem. Has anybody else had this issue?
 

slowlmm

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is the hood closed ? did you try the old ecm to see if the remote start would work i actually had the same problem and there was a standing code in the backround tht i could not get rid of and tht would make the remote start not work. there may be no light on the dash but ill be theres a code in the backround
 

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Yup the hood is closed.. There are codes, but they are the same codes that are on my truck. IIRC it's an egt sensor circuit code, all DPF/EGT codes are set at "X: Not Reported, No Mil" but the code still shows up. I missed some codes on my truck when I ditched the DPF, but the truck started and died right away, this truck isn't even cranking at all.
 

slowlmm

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yea i had tht standing egr code tht would not allow my remote start to work with my new os. but with my origonal os same standing code the truck would remote strart fine. do you have the origonal ecm you can put back in to see if it will start and run ok or have you tried flashing the new ecm again ?
 

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Jan 27, 2008
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yea i had tht standing egr code tht would not allow my remote start to work with my new os. but with my origonal os same standing code the truck would remote strart fine. do you have the origonal ecm you can put back in to see if it will start and run ok or have you tried flashing the new ecm again ?
I am going to try flashing a different OS in and see if it works
 

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083 os flashed, still the same problem. Truck recognizes the remote start signal, but doesn't start. Sitting in the truck and hitting the remote start button on the key fob, I see the engine light for a second, hear the sound of a module power up (I believe the glowplug controller, could be wrong), but the engine doesn't crank.
 
With the last update we made to the software to allow the full reflashing, the additional data that is gathered (as mentioned above by John) is only so a complete operating system can be transferred to another ECM, all the normal calibrations from a truck have always been read out so it should not matter if you have an old or new file version.

I would suspect the two primary reasons it's not working is either -
1 - One of the emissions related DTC's being set.
2 - VATS not learnt correctly.

With the new ECM, did you just plug it in the truck and it ran?
Something you might want to try with the new ECM in the truck.
In the tune tool go to the System section, then VATS.
Make sure G0301 is set to 'Enable'
Set G0302 to 30 (seconds).
Set G0304 to 1

Then follow the proceedure in the description for G0302.

I can't gaurantee this will work to fix your problem, but certainly on the gas ECM's this is something that must be done to learn the theft codes on a new ECM, but normally they will not even start without the relearn proceedure being done.
I also looked through the TechII menus for VATS relearn on the LMM and could not find anything, which confuses me even more!

I have also added in a few new PID's to the scantool to show the reasons why the remote start was disabled, these will be in the next update (due this week).

The only advantage in getting the dealer to reflash the new ECM is the tune that will be flashed in is 'exactly' the one for the truck, but, if you already have a copy of he's stock tune then there is no advantage in visiting the dealer now EFILive will do a full reflash on the ECM.

We'll figure this out soon enough I am sure.

Cheers,
Ross
 

slowlmm

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Def sounds like a standing code issue i had the same problem and couldent figure it out switched back to my old ecm and no problems. i belive its tht egr code you are setting thts doing it
 

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I programmed the GPM flow rates into the ECM and the problem is fixed now. Thanks to all who helped out, this was pretty stubborn problem!!