For some reason my ABS light keeps turning on and off randomly, making a bell go off. You can hear the ABS motor pulsing when you push the bakes when its doing that. Could that be a bad ABS module?

 

ttt.....

 

I had that problem with a bad ground. My battery finally stopped charging. I think the abs light is one of the first to go off when voltage is wrong. It could also just be a sensor. When I fixed the ground, no more abs light.

 

Rear speed sensor maybe?

 

I checked the code with HPTuners and this is what i got. C0227, C0225, C0226. Its the left hand wheel speed sensor. But, when i checked the front LH wheel i thank the wheel bearing is going out. Could that cause the ABS light to come on randomly?

 

I've seen this a few times my friend, and it usually turns out to be a ground problem. Follow this diagnostic bulletin and this should help.

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)



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




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


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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 WheelŽ.
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 Nˇm (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.

 

Thanks for the bulletin! I will give that a try!

 

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