I didn't see any updates on this thread, but I'm new here and I have a doozy of a DTC C1233 on my 2003 Corvette, I got a C1233 code which also turns on the ABS light and turns off Active Handling and Traction Control and I did the normal thing I replaced the entire hub assembly and it did Nothing, still the 123 and I then decided to got to a Chevrolet dealership in NJ Mall Chevrolet on Haddonfield rd. In cherry hill, and they decided on putting another Hub assembly on ( I know I should of left right then and there ) but I'm stupid and of course, then they said when I went to pick up my car that it wasn't fixed and I needed a new EBCM (Which are no longer available.) AND they stole parts off my car while it was there ! So I contacted Chevrolet Customer service and they sent me to a much better dealership Bryner Chevrolet in Jenkintown PA, and real nice folks and they worked on it for 4 hours and then told me the EBCM was faulty. So I went home and took off the EBCM and sent it to ABSFixer.com, again real decent people and the shop sent it back and said this particular EBCM is shot and can't be repaired. So then i found one rebuilt with a 2 year warranty, I got it back and put in on and made sure everything was right, cleared the codes and took it for a short drive and again the ABS light and the code C1233 came back so I swapped the right wiring harness from the left side and still the code came back so I had already bought 2 new wiring harnesses installed them and nothing again. The damn C1233 is still there. I contacted Chevy Customer service and asked if I could contact GM technical services, but I haven't gotten a reply yet. This car has only 10.572 miles on it, it was never is any accidents and there is no damage anywhere evident, so I'm lost here, how can something so simple become a problem ? Everyone says to do a wiring load test and that kind of thing, but that is beyond my skill set and I live in a Good Repair shop desert, anything more complex than a Oil and filter change or flat tire, there are no competent shops ? Thank you

Where are you located exactly. Your profile is not filled out.
Here are shops in Cherry Hill area. You can search yourself from this page.
https://iatn.net/repair/?action=sear...6312&show_all=

Thank you Carfixer007 I live just outside and down river from Philadelphia in Delaware county PA. I'm not too sure it can be fixed at this point. One shop said "Just ignore the lights" so you can see, I live in a Auto service desert !

Posts 1, 2, and 3 were originally posted in a seven year old thread about a 2002 Buick for some reason. They have now been moved here to a new thread in the Chevrolet forum, and the other thread has been closed.

It sounds like wiring to me. That, and a lack of diagnostic skills in your area.

I don't usually like to refer off of GMForum as we have talent here that know our way around this kind of stuff. In your case, I believe we can solve it, but someone on your end needs to be able to diagnose and repair electrical stuff. I found this thread has some pretty good info, especially this post. Looking around elsewhere I see similar references to similar Corvettes from similar model years with similar miles having the same issue and getting fixed the same way. Unfortunately, this means digging into the wiring some more. If you aren't up to it, you'll have to convince a shop that you know what you're talking about when you tell them how to do their jobs. This is a difficult situation to navigate.

What you need is a shop that has someone that actually knows how to diagnose things, especially electrical. The closest one I know of (from nearby Hall Chevrolet) is the guy: https://www.youtube.com/@SouthMainAuto/about

I've seen him diagnose many crazy electrical issues. He'* 300 miles away. From what I can tell of your situation, it would be worth it to get the problem resolved.

Since I'm really just out of ideas, I pulled off the panel from just in back or the passenger side front wheel ( I was kinda thinking maybe it had a leaking wet cell battery at some point, but when I got it off and looked inside NaDa, just like it came from the factory,) chassis still has the black paint and the entire area id in perfect condition like it left Bowling Green assembly plant. Car was never in any accidents and currently has 10.573 on the odometer ? I installed a new speed sensor and the entire wheel assembly, swap both wheel speed senor wiring harnesses and since the Chevrolet dealership i took it to, said the EBCM was in fact the cause. Sent it out to ABSFixer.com ( great people tested it and sent me a rejection email saying it wasn't rebuildable ) so I found a rebuilt one from a company who rebuilds the Auto Science Inc., they had one and programed it to my VIN# sent it back I put it back in and Nothing, still get a C1233. I also have a B2860 code but that is a minor issue. The one thing, the DTC never changes ?

If they are not rebuildable how do you get a rebuilt one?

I get to nitpicking to much. I believe yours was not rebuildable due to parts being more than worth.

Did you try . . .

. . . ?

This is good news. It'* likely not an issue related to rot.

Okay, so one mile more than in your first post, but you have a question mark at the end of this sentence . . . so are you asking us?

This is all essentially a recap of Post #1, right? . . . or did you do the same stuff again?

Sounds like it is accurately diagnosing an actual condition.

My advice: This needs to go to someone who can really troubleshoot electrical. Throwing parts at it isn't going to work.

Not all EBCM'* are not rebuildable, The one I bought was for a C5 Corvette, but after 2001 they were built by Delphi Electronics ( Part Of General Motors ) Not by Borsch and it is configured to my VIN # number, and it comes with a 2 year warranty, but I am still getting the DTC 1233.