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In my 2001 Suburban I have a C0265 code which is Electronic Brake Control Module Relay Circuit. What can I do to fix it? Both my ABS light and Park Brake light are on because of it. Since my suburban has the auto 4wd system it will not going into 4wd, so I need to get it fixed. Thanks
 

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In my 2001 Suburban I have a C0265 code which is Electronic Brake Control Module Relay Circuit. What can I do to fix it? Both my ABS light and Park Brake light are on because of it. Since my suburban has the auto 4wd system it will not going into 4wd, so I need to get it fixed. Thanks

The below Information should be able to help with DTC C0265


G.M.Document ID# 1988903

Subject: ABS Light On, DTCs
C0265, C0201, U1041 Set and/or Loss of Communication with Brake Module (Reground EBCM Ground) #04-05-25-002D - (06/14/2007)

2002-2006 Cadillac Escalade, Escalade EXT

2003-2006 Cadillac Escalade ESV

1999-2007 Chevrolet Silverado Classic

2000-2006 Chevrolet Suburban, Tahoe

2002-2006 Chevrolet Avalanche

2002-2007 Chevrolet TrailBlazer, TrailBlazer EXT

2003-2006 Chevolet SSR

1999-2007 GMC Sierra Classic

2000-2006 GMC Yukon, Yukon Denali, Yukon XL

2002-2007 GMC Envoy, Envoy XL, Sierra Denali Classic

2004-2005 GMC Envoy XUV




Condition:...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.

Cause....A Poor Connection at the EBCM ground is causing unnecessary replacements of Brake Modules.

Important:....The EBCM Ground is different for each application. Refer to the list below for the proper ground reference:

• Midsize Utilities = Ground 304

• SSR = Ground 400

• Fullsize Trucks and Utilities = Ground 110


Correction:....DO NOT REPLACE THE BRAKE MODULE.

Perform the following steps to improve the connection of the EBCM Ground:
...Remove the EBCM Ground.
...The EBCM Ground is located on the frame beneath the driver's side door.
...If multiple grounds are found in this location, the EBCM ground can be identified as the heavy (12-gauge) wire.
...Clean the area, front and back, using a Whiz Wheel®.
...Install the ground, then the washer and then the bolt to the frame.

Important:....It is important to use the bolts, washers and nuts specified in this bulletin. These parts have been identified due to their conductive finish.

Install a washer and nut to the back side of the frame.
Tighten
Tighten the nut to 9 N·m (79 lb in).

Cover the front and back side of the repair area using Rubberized Undercoating. An additional check can be made to ensure a good connection for the Battery Cable to Frame ground. It is possible for this ground to cause similar symptoms with the ABS as described above.

Parts Information:....FULL-SIZE TRUCKS, SUVs AND H2

Description.....Part Number#
***Bolt...........#11588564
***Washer.......#15650962
***Nut............#15672934
***Rubberized Undercoating/Paint-able...#12378398
 

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In my 2001 Suburban I have a C0265 code which is Electronic Brake Control Module Relay Circuit. What can I do to fix it? Both my ABS light and Park Brake light are on because of it. Since my suburban has the auto 4wd system it will not going into 4wd, so I need to get it fixed. Thanks
The EBCM relay circuit is internal to the module. You have to pull the module and open it to access the printed circuit board where the relays are soldered. The solder joints have cracked and need to be reflowed.

Reflowing the solder joints fixed my ABS problem.
I cleaned all the ground points under the truck and it did not help.

You can try cleaning first the ground points as they are very easy to do.

Here is what I did to fix the same problem in my 2001 Suburban.
http://www.gmtruckclub.com/forum/showthread.php/92093-ABS-module-removal

Here is the video.
http://www.youtube.com/watch?feature=player_embedded&v=P_6Sk7-fm0I

http://youtu.be/P_6Sk7-fm0I
 

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I have code c0265 on a 2002 gmc envoy, I replaced the computer before reading stuff online... and that didn't fix my problem... so I tryed the ground wire trick next and it didn't work... so know I don't know what to try next, any ideas?
 

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I have code c0265 on a 2002 gmc envoy, I replaced the computer before reading stuff online... and that didn't fix my problem... so I tryed the ground wire trick next and it didn't work... so know I don't know what to try next, any ideas?
-hey I know it's been a while since you posted this up but what did u end up doing to your vehicle to fix the problem
 

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Had this code on my 2001 Blazer and thought I would share my experience in repairing the ABS control board. It's not hard to do and is worth an hour or so of time to give it a try. You will need a torx driver, soldering iron and solder, razor blade as well as some silicone adhesive (GE Silicone calk) to reseal the ABS control module cover.

On the Blazer removal of the ABS control module is a fairly easy task. There are 4 torx screws securing the module to the ABS valve body which are very accessible and easy to remove. Once removed it's easy to disconnect the electrical connections and remove the control moduel from the vehicle.

Opening up the control module cover takes some effort as it is secured to the enclosure with both torx screws and also silicone adhesive. Remove the screws and then take a razor blade to carefully cut along the cover to separate it from the housing. It takes some time but is fairly straight forward. Once the adhesive is sufficiently cut, the cover can be gently pried away from the housing.

As described in this thread the problem was a cracked solder joint on one of the relay pins. (see photos) Because of what I consider a poor circuit board pattern design, the relay pin shown in the photo was not soldered properly and eventually the solder joint fractured. The crack on my unit was very difficult to see until I flexed the pin on the relay with long nose pliers, then it became obvious.

Because of the 4 heavy copper traces connecting the relay solder pad to the surrounding copper plane on the PC board you have to apply a lot of heat to solder the pin sufficiently. The copper traces suck the heat away your soldering iron so be patient and make sure the solder flows well when applying it. For peace of mind I resoldered all of the pins on the relay just for completeness. Afer re-assembling and reinstalling the module I erased the fault code and the ABS has been fine ever since.

Hope this helps some of you and also saves you from spending several hundred dollars (or more) having to replace the entire module.
Blazer ABS Module Relay Pin 2.jpg
Blazer ABS Module Relay Pin 1.jpg
Blazer ABS Module 1.jpg
 
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