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Scanner reporting C0236 rear wheel speed missing

Tiny
HOUDEY
  • MEMBER
  • 2005 BUICK RANIER
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
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.
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Tuesday, June 28th, 2022 AT 1:03 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,072 POSTS
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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Wednesday, June 29th, 2022 AT 10:26 AM
Tiny
HOUDEY
  • MEMBER
  • 2 POSTS
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
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Thursday, June 30th, 2022 AT 4:32 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,072 POSTS
It will help in the long run, you will like the scanner.
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Thursday, June 30th, 2022 AT 8:27 PM

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