I have a friend who purchased a 2004 LB7 in February and has had this problem ever since. After leaving the dealership the "Service Brake" indicater light came on about five miles down the road. They took it right back and the techs couldn't get a code. Now they are saying that GM engineers are working on a fix. After six weeks the light is still on. They have called the "customer service" number and get told the same thing there. Has anyone else had this problem? Any ideas?

I have had my service brake message come up on mine at startup - they gave me the same "line". I asked them to check the ground wire from the brake controller - I don't think they did this because it did the same thing a week later...


Per a tech here on the board - there is a ground wire for the anti-lock brake controller that is connected to the frame - sometimes it doesn't make good contact due to the undercoating on the frame; Scrape off the undercoating at this location and reattach ground wire.


If this doesn't do it, I would strongly suggest that the anti-lock brake controller be swapped out - unless there are some sensors that they suggest they replace first...


- jeff

Thanks Jeff. I'll pass that along.

By the way, mine does it once every couple of months on startup - I think because I have my foot lightly on the brake when I turn the ignition; If I turn off the ignition, take my foot off the brake and restart - no service brake message on the DIC...


If mine did it while driving down the road - I would be all over their butt to fix it...


-jeff

here is the TSB to what he is refering to :
<H1>ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground G110 ABS Ground) #04-05-25-002 - (03/10/2004)</H1>


</TABLE>ABS Light On, DTCs C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground G110 ABS Ground)


2004 Buick Rainier


2002-2004 Cadillac Escalade, Escalade EXT


2003-2004 Cadillac Escalade ESV


1999-2004 Chevrolet Silverado


2000-2004 Chevrolet Suburban, Tahoe


2002-2004 Chevrolet Avalanche, TrailBlazer, TrailBlazer EXT


2003-2004 Chevolet SSR


1999-2004 GMC Sierra


2000-2004 GMC Yukon, Yukon Denali, Yukon XL


2002-2004 GMC Envoy, Envoy XL, Sierra Denali


2004 GMC Envoy XUV


2002-2004 Oldsmobile Bravada<A name=ss1-1470578><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1470578&amp;pubid=437&amp;evc=sm#ss1-1470578" target="_blank">
<H5>Condition</A></H5>


Some customers may comment that the ABS light is on. Upon further inspection, DTCs C0265 and C0201 may be set in the brake module. It is also possible for DTC U1041 to set in other modules. There may also be a loss of communication with the brake module.<A name=ss2-1470578><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1470578&amp;pubid=437&amp;evc=sm#ss2-1470578" target="_blank">
<H5>Cause</A></H5>


A poor connection at the G110 ABS ground is causing unnecessary replacements of brake modules.<A name=ss3-1470578><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1470578&amp;pubid=437&amp;evc=sm#ss3-1470578" target="_blank">
<H5>Correction</A></H5>


DO NOT REPLACE THE BRAKE MODULE.


Perform the following steps to improve the connection of the G110 ground:

<LI =1>Remove the G110 ground. The G110 ground is located on the frame beneath the driver's side door. If multiple grounds are found in this location, the G110 ground can be identified as the heavy (12-gauge) wire.
<LI =1>Clean the area, front and back, using a Whiz Wheel®.
<LI =1>Install the bolt, ground and a star washer to the frame.
<LI =1>Install a star washer and nut to the backside of the frame. Tighten


Tighten the nut to 9N·m(79 lb in).
<LI =1>Cover the front and back side of the repair area using Rubberized Undercoating. </LI><A name=ss4-1470578><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1470578&amp;pubid=437&amp;evc=sm#ss4-1470578" target="_blank">
<H5>Parts Information</A></H5>



<TABLE width="100%" border=1>
<T>
<TR>
<TH vAlign=bottom align=middle colSpan=2>


FULL-SZE TRUCKS, SUV'S AND H2</TH></TR>
<TR>
<TD vAlign=center align=middle>


Part Number</TD>
<TD vAlign=center align=middle>


Description</TD></TR>
<TR>
<TD vAlign=center align=middle>


11588564</TD>
<TD vAlign=center align=middle>


Bolt</TD></TR>
<TR>
<TD vAlign=center align=middle>


00178537</TD>
<TD vAlign=center align=middle>


Washer</TD></TR>
<TR>
<TD vAlign=center align=middle>


15672934</TD>
<TD vAlign=center align=middle>


Nut</TD></TR>
<TR>
<TD vAlign=center align=middle>


12378398


(in Canada, 10952414)</TD>
<TD vAlign=center align=middle>


Rubberized Undercoating -- Paintable</TD></TR></T></TABLE>
<TABLE width="100%" border=1>
<T>
<TR>
<TH vAlign=bottom align=middle colSpan=2>


MIDSIZE SUV'S</TH></TR>
<TR>
<TD vAlign=center align=middle>


Part Number</TD>
<TD vAlign=center align=middle>


Description</TD></TR>
<TR>
<TD vAlign=center align=middle>


11517555</TD>
<TD vAlign=center align=middle>


Bolt</TD></TR>
<TR>
<TD vAlign=center align=middle>


11503663</TD>
<TD vAlign=center align=middle>


Washer</TD></TR>
<TR>
<TD vAlign=center align=middle>


11503749</TD>
<TD vAlign=center align=middle>


Nut</TD></TR>
<TR>
<TD vAlign=center align=middle>


12378398

Thanks everyone. Sure would be nice if it is just a bad ground!

I cleaned my ground and mine will do it every once and awhile at startup still.


BUT only if the brake pedal is being pushed on startup. not sure why this makes a difference but like someone else said if I shut it off and restart without touching the brake....Good to Hook.