ABS Assembly Replacement - Programming Necessary?

Tiny
GJWILL
  • MEMBER
  • 2001 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 170,000 MILES
Hello,

I replaced the ABS Assembly in my 2001 Chevrolet Suburban 1500 LS w/o traction control, with a used, compatible ABS Assembly (twice). ABS light is still on. Am I required to reprogram the ABS module for it to run properly?
Tuesday, August 19th, 2025 AT 11:24 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,610 POSTS
No the ABS module self learns, can I ask what the ABS code is? You probably have a front bearing hub going out which houses the ABS wheel speed sensor. This is a common problem with these 4x4 subs. Here are two videos to go over to help us fix it.

https://www.youtube.com/watch?v=ZgiPRG6jffc

and

https://www.youtube.com/watch?v=Pb6nXV-iamI

Please go over these and get back to me so I can help you fix it.
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Wednesday, August 20th, 2025 AT 12:14 PM
Tiny
GJWILL
  • MEMBER
  • 3 POSTS
Thank you for your feedback. The code being thrown is C0265 (Solenoid Control Monitor Error) Fix: Replace EBCM. Which I've done twice.

I also replaced:
- all 4 Brake Calipers/Rotors/Pads
- Master Cylinder
- Vacuum Booster
- Brake Lines
- Front Wheel Speed Sensors

It doesn't feel like I have any rear brakes. The front brakes tend to lock up when I brake hard. The ABS unit obviously is not working.

I appreciate your advice in advance!

Greg
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Wednesday, August 20th, 2025 AT 1:59 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,610 POSTS
Okay, there is a main ABS system ground on the left front of the body mount, (black wire) , Here is a guide you can use to test it, connect the test light to power for the test.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Disconnect the electrical connector first, let us know how it goes
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Wednesday, August 20th, 2025 AT 5:16 PM
Tiny
GJWILL
  • MEMBER
  • 3 POSTS
Thank you for your response. A few additional points if I may. I detached, cleaned and re-bolted the two ground wires in the left front of the body mount previously as I heard there were issues with this. That said, I did not test the wiring to the ABS module itself. I am not quite sure how to go about what you advised above. I do have a multimeter (though I'm by no means a pro at using) but I do not have the test light. Further, I am not certain how to test this.
1. Do I unplug the ABS unit from the wire harness as well as the ground wire that is attached to the body? From there I am not sure how to use the multimeter to test for power, or ground.
2. Can you direct me specifically on how to do this?

Really appreciate your help!
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Thursday, August 21st, 2025 AT 8:32 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,610 POSTS
Yes, remove the large electrical connector red/black, then set you meter to ohms and use the red lead to contact the black wire in the connector, then touch the black lead to a good ground, have the meter set to OHMS, the should be 0 or close to 0 for the ground to test good. But I need to tell you testing without load can give toy a false reading.
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Thursday, August 21st, 2025 AT 10:21 AM

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