I get both lights all most all the time now after installing new muffler it never stay once truck is off and turned back on its gone until a lil while after driving also got a code C0256 is there anyway to tune out the abs or delete it? 02 gmc sierra by the way

 

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.

 

thanks for the info...

 

not a problem at all. i had this problem and this took care of the issue. but i have a spare brake module if you need one.

 

would this be the ground?

 

Yup thats the one!

 

I have a ?. My abs light comes on when I am drivin down the road. some times it wont and some times it will. what would cause it to do that? i was told it might be a abs sensor lose on one of the wheels. 03 GMC sierra with a 4-6 drop.

 

I had this problem a while back where my Abs and brake light was coming on while driving. It ended being the connector under the hood. The prongs were facing straight up so when I was hitting bumps the connection was going on and off. Fixed and no problems since.

 

could be a sensor. i had mine pick up alot of road debris over the years and i needed to pull mine and clean them. you could go down to the local auto parts store and pick up a ABS code reader and check it.

 

were is the connector under the hood?