Duramax Diesels Forum Truck of the Week
  #1  
Old 07-28-2018, 02:34 PM
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Default Service Trailer Dash Light

2016 LML just started throwing the Service Trailer Brake Light On dash.
The only thing is I havnt pulled a trailer yet. Anyways any ideas what I
Should check besides pulling a battery cable. Thanks
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Old 07-28-2018, 03:54 PM
Washingtonlmmm Washingtonlmmm is offline
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Ya Iím curious about this too My light comes on everynow and then goes away as soon as truck is off. But my abs light also comes on. Does yours?
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Old 07-28-2018, 09:39 PM
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They do this sometimes when it gets wet inside the connector.
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Old 07-29-2018, 06:02 AM
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^ yep...

Why the 2500 diesel if you don't pull trailers?
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Old 07-29-2018, 09:16 AM
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Quote:
Originally Posted by NC-smokinlmm View Post
^ yep...

Why the 2500 diesel if you don't pull trailers?
That matters on this site?
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Old 07-29-2018, 12:22 PM
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Quote:
Originally Posted by NC-smokinlmm View Post
^ yep...

Why the 2500 diesel if you don't pull trailers?
This.
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Old 07-29-2018, 05:06 PM
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Quote:
Originally Posted by TheBac View Post
That matters on this site?
Touchť...
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1969 MGB GT MKII Factory Condition

2016 LML CCSB Denali < Lifted 22's/35's, Fox 2.0 < I officially need help.
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Old 08-11-2018, 11:21 PM
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[QUOTE=Washingtonlmmm;1108562]Ya Iím curious about this too My light comes on everynow and then goes away as soon as truck is off. But my abs light also comes on. Does yours?[/QUOTE

Loose or dirty ground. Look under driver door, on frame. I believe this is an ABS control module ground. Start there.

There will also be codes to pull from the ecm/tcm. If one relates to the abs control module then this is likely the issue. If either rear tail light blinks after locking the doors with remote, and I mean one side will blink for 15 minutes after door locking, then this particular ground is the issue. Can also check resistance from module I believe also there are more grounds than this one for the abs c/m. The back up camera display lines will freeze also.

Whatever you do, if you have tuning, do not change/modify the tune while this issue is present, youre ecm will lock and youll have a no start condition with mismatching ecm and tune vin.
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Old 09-16-2018, 04:55 PM
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Quote:
Originally Posted by Washingtonlmmm View Post
Ya Iím curious about this too My light comes on everynow and then goes away as soon as truck is off. But my abs light also comes on. Does yours?
No I have not had the abs light yet. Just that trailer break light.
Comes on like once a week
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Old 09-16-2018, 04:58 PM
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Quote:
Originally Posted by NC-smokinlmm View Post
^ yep...

Why the 2500 diesel if you don't pull trailers?
I pull a trailer sometimes. Plus I have a Semi too. I like having the 2500hd.
I get good mileage with it too. But I donít probably need! But it comes
In handy when I do.
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Old 09-16-2018, 04:59 PM
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[QUOTE=scramHD;1109624]
Quote:
Originally Posted by Washingtonlmmm View Post
Ya Iím curious about this too My light comes on everynow and then goes away as soon as truck is off. But my abs light also comes on. Does yours?[/QUOTE

Loose or dirty ground. Look under driver door, on frame. I believe this is an ABS control module ground. Start there.

There will also be codes to pull from the ecm/tcm. If one relates to the abs control module then this is likely the issue. If either rear tail light blinks after locking the doors with remote, and I mean one side will blink for 15 minutes after door locking, then this particular ground is the issue. Can also check resistance from module I believe also there are more grounds than this one for the abs c/m. The back up camera display lines will freeze also.

Whatever you do, if you have tuning, do not change/modify the tune while this issue is present, youre ecm will lock and youll have a no start condition with mismatching ecm and tune vin.
. Thanks
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