ABS light stays on

Let's start with backing up and finding out how he determined this was the issue.

Was there an error code or some sort of diagnosis that lead him to this part?

I am assuming he has a code that is naming this part but if you can get us the code then we can figure out what this is talking about. I assume we are dealing with a naming issue that on your truck is just called something different.

Here is a guide that will help with getting ABS codes because you need a scan tool that will read ABS.

https://www.youtube.com/watch?v=rTtAnsOlZU4

Let's start with this and go from there. As for the odometer issue, let's get a new post started on that one as we need to keep each post to one issue so that others can find it if they have a similar issue.

Thanks

Okay. That is good info. Yeah, we always need the code because they always lead to testing and not just replacing a part.

This very well could be the issue but without the code, we would have to go through about 500 codes looking for one that mentions this part. However, I don't think the name of the part is going to be the same.

A lot of times, the scan tool will recognize the code and then the tool manufacturer calls that part on that code something different then GM so the terms are different.

If these lights are still on then those codes are still there so worst case we can just scan it again and get them. Thanks

Sounds great. We will wait to hear back and I am sure we will figure this out once we get the code. Thanks

Hello, yes your family mechanic is correct. Each solenoid in the abs module is monitored by a feedback circuit as described in the 1st diagram below. The last code is an internal malfunction in the abs module of EBCM. Replacing the wheel sensors wont fix this issue. And the most ABS modules need to be programmed after installation and bled properly with a scantool that can open up the solenoids inside the abs module. The first 2 codes are for wheel sensors, but if the module itself has failed somehow, it can trigger codes for wheel sensors just because it cant read them properly. But the power and ground circuits to the abs module should be checked first before replacing it. If there is a wiring issue and its not getting power, this can be seen as a failure as well. Ill post the wiring diagram for the ABS circuits,

*Edit here are the powers and ground circuits for the ABS module. pics 4,5,6,7
The Red wire is 12volts all the time, The Brown wire is 12v with the Key in the On position and the Black wire is the Ground going to the body somewhere near the ABS module. These should all be tested while the vehicle is running so that the circuits are loaded. And a voltage drop test is the proper method.

https://www.2carpros.com/articles/how-to-replace-a-abs-controller

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-use-a-voltmeter

*Edit Actually there is a Technical Service Bulletin on this issue. These are for lose of communication issues and setting of code P0265.
Looks like they might have a grounding issue on the body and some other problems.

*Edit, This last Bulletin is an interesting one, seems they have found a bad soder joint on the circuit board and recalled a bunch of units. This would be the last diagram below. I found that one to be of the most important part of the TSB's.
There seems to be alot of instances and reasons for this last code(p0265), So a full check of the abs module itself should be done as well as a check of the wiring harness.

Yes, the solenoids are inside the ABS hydraulic module, usually there's 2 or 3 solenoids per wheel, and the module monitors those solenoids by a feedback circuit. So, it's basically just watching the current flow and can detect a problem from there.