2002 Chevy 1500 LS 4.8L ABS module help

lownslowhoss · Feb 18, 2026

Hello, I am new here, but it's nice to see a web page dedicated to purely GMT800s. I'm having an issue with my brakes. I've done speed sensors (all of them), master cylinder, brake lines, pads, rotors, fluids, and calipers are working fine. I've changed fuses, reset codes, all of it, but that damn ABS light persists. I fear I may have to do some work on the ABS module itself, but I do NOT want to spend unnecessary money for replacement when I can just repair it myself, but I wouldn't know where to start or what connections to check. Has anyone done this before and can give me some insight? Thanks for looking.

AuroraGirl · Feb 18, 2026

lownslowhoss said:
Hello, I am new here, but it's nice to see a web page dedicated to purely GMT800s. I'm having an issue with my brakes. I've done speed sensors (all of them), master cylinder, brake lines, pads, rotors, fluids, and calipers are working fine. I've changed fuses, reset codes, all of it, but that damn ABS light persists. I fear I may have to do some work on the ABS module itself, but I do NOT want to spend unnecessary money for replacement when I can just repair it myself, but I wouldn't know where to start or what connections to check. Has anyone done this before and can give me some insight? Thanks for looking.

CODES. What CODES aere in it

stutaeng · Feb 18, 2026

Yeah, as @AuroraGirl asked, what codes do you have?

On the ABS (EBCM) module, many folks have successful simply opened it up and reflowing the solder on them. There's YT videos showing how to do it.

The EBCM on my 99 failed a few years ago, and when I removed it, the little coils were rusted to the pump modulator pins, so I broke a few of them. I got a remanufactured EBCM and it worked. ABS/Brake light went off. I can't remember what code I had, but online search basically pointed to the EBCM as failed.

Be carful removing the little torqx screws. I stripped mine out and had to drill them out with a right angle drill adapter and a short drill bit. Dorman sell stainless steel screws, or get some stainless hex cap head screws from your specialty hardware stores.

AuroraGirl · Feb 18, 2026

Subject:

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

Models:

2004-2007 Buick Rainier

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

2002-2004 Oldsmobile Bravada

This bulletin is being revised to update model years. Please discard Corporate Bulletin Number 04-05-25-002C (Section 05 -- Brakes).

[H3]Condition[/H3]

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.

[H3]Cause[/H3]

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

[H3]Correction[/H3]

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.

[H3]Parts Information[/H3]