scanner reporting C0236 rear wheel speed missing

2005 BUICK RANIER
180,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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HOUDEY
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Clear the code and take the car for a ride. After around 8 MPH guess (speedometer not working) the ABS goes on and brake light is on also with message fixed braking system. Also, at the same time the transmission drops to limp mode, like I am in second gear.

Replaced transmission VSS and same results.

Checked voltage and resistance, of each front left and right wheel sensor both with in spec.

Shift fine, no other issues I am aware of.

Is there a way to verify the VSS (transmission} is good? Suspect possible EBCM or PCM controllers. Not sure what it could be.

Note: Replaced PCM 2 years ago had numerous code errors. Fixed the problem.

Please advise.
Jun 28, 2022 at 1:03 PM
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STRAILER
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The ABS module sounds like it is going out because the ABS system gives vehicle speed information to the PCM and CAN. To be sure let's do a CAN scan which is the future of automotive repair you can get a CAN scanner from Amazon for about $30.00 here is a video to show you how and a link to a scanner from Amazon. I have included how to change out the ABS module in the diagrams below.

https://youtu.be/u-4syLc-ifQ

and

https://amzn.to/3OpAotj for the scanner

This guide can help as well:

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Jun 29, 2022 at 10:26 AM
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HOUDEY
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I want to apologize for my ignorance about the CAN scanner. After researching I now understand why you want me to purchase Amazon scanner which has the technology of the CAN which scan the communications of the controllers. So will purchase the Amazon scanner before I replace anything. Thanks again.

Al
Jun 30, 2022 at 4:32 AM
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STRAILER
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It will help in the long run, you will like the scanner.
Jun 30, 2022 at 8:27 PM