Duramax Diesels Forum Truck of the Week
  #1  
Old 05-08-2018, 03:07 PM
LBZ_Baker98 LBZ_Baker98 is offline
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Default LMM Duramax from hell!!!

So we've had a 09 LMM dually for awhile now that no one can figure out. It started with blowing the DLIS (2amp) fuse randomly it progressively got worse where the fuse would blow as soon as you turn the key on. We were able to throw a slightly bigger fuse in the truck to get it started to get it on the trailer and home. Now the DLIS fuse doesn't blow when the key is turned on and the truck won't start unless you jump the starter. If you jump the starter truck will run great. It's throwing codes P2510,u1041,u0140,P2536. Replaced ignition no change. Replaced TCM. No change. Replaced BCM but can't do the 30 mins key cycle to marry it to ECM. Truck still runs if you jump the starter. Spent countless hours tracing wires. When you turn the key off and open the door the radio and interior lights stay on. You have to disconnect batteries to get them to go off. We are at a loss any help is greatly appreciated!
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Old 05-08-2018, 04:28 PM
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I have a Jeep Grand Cherokee that had the same problems , I know do not hate on me yet Sometimes when you hit the key , nothing , next time it was ok then the dome lights would not go out then the radio would stay on then the compass would go off and on then the high beam indicator quit working , when you mentioned open the door , well I found after much searching 4 partially broken wires in the drivers door and 2 in the passenger door , they were broken inside the shielding , sometimes they would make contact and sometimes no , now they are fixed and all the problems are gone ! Good Luck !
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Old 05-08-2018, 05:22 PM
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You should use a Tech2 or equiv to check data transmission across the different modules.

Do you have any aftermarket modules like an alarm installed on the truck?
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Old 05-09-2018, 07:01 AM
LBZ_Baker98 LBZ_Baker98 is offline
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Quote:
Originally Posted by TheBac View Post
You should use a Tech2 or equiv to check data transmission across the different modules.

Do you have any aftermarket modules like an alarm installed on the truck?
No after market modules. Been trying to get ahold of a tech 2 but you know how that goes. Could it maybe just need the BCM programmed the fuse that was originally blowing quit blowing after the BCM was replaced!
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Old 05-09-2018, 08:50 AM
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Have you been using electrical diagrams in your diagnosis?
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Old 05-09-2018, 09:59 AM
LBZ_Baker98 LBZ_Baker98 is offline
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Quote:
Originally Posted by juddski88 View Post
Have you been using electrical diagrams in your diagnosis?
I tried bto but it's hard to find any to be honest
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Old 05-09-2018, 10:26 AM
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Alldata.com has them.


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Old 05-09-2018, 10:10 PM
LBZ_Baker98 LBZ_Baker98 is offline
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Does anyone think maybe the BCM just needs to be programmed? Since the BCM was replaced it quit blowing the DLIS fuse but truck won't start with key. BCM has not been programmed at all since replacement
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Old 05-09-2018, 10:13 PM
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Well, have you tried the relearn process? Was the BCM used or new? If used was it from the same vehicle type?
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Old 05-09-2018, 10:17 PM
LBZ_Baker98 LBZ_Baker98 is offline
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Quote:
Originally Posted by 2004LB7 View Post
Well, have you tried the relearn process? Was the BCM used or new? If used was it from the same vehicle type?
It was new, I'm not familiar with relearn process I guess. I thought the only way was with a tech 2?
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Old 05-09-2018, 10:52 PM
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If new you will need to get the truck to the dealership and have them programe it. Wont run otherwise. Ben here may also be able to help you on this too as he has the capability of programming BCMs
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  #12  
Old 05-09-2018, 11:09 PM
LBZ_Baker98 LBZ_Baker98 is offline
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Quote:
Originally Posted by 2004LB7 View Post
If new you will need to get the truck to the dealership and have them programe it. Wont run otherwise. Ben here may also be able to help you on this too as he has the capability of programming BCMs
If the BCM isn't programmed will it still run if I jump the starter?
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Old 05-10-2018, 05:57 AM
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Does anyone have a wiring diagram?
This to me sounds like a grounded wire somewhere
Btw need to get the BCM synced with the rest of the truck
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Old 05-10-2018, 08:08 AM
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Quote:
Originally Posted by LBZ_Baker98 View Post
If the BCM isn't programmed will it still run if I jump the starter?
Unless someone disabled VATS in the ECM, the truck will not run due to being in theft lock mode.
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Old 05-10-2018, 01:01 PM
LBZ_Baker98 LBZ_Baker98 is offline
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Quote:
Originally Posted by JoshH View Post
Unless someone disabled VATS in the ECM, the truck will not run due to being in theft lock mode.
So I didn't get BCM programmed but I jumped starter and had to drive the truck. Got into town the theft light came on dash and now it starts with the key but the theft light is on
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