First, I am assuming 762mm meant C0265, not P0265. Secondly, I just wondering if these codes C0241,C0242, C0245, C0251, C0252 are symptons of a faulty EBCM? Is there anything I should look at, before I just go rebuilt my EBCM? Or worse yet replace it?

 

Before getting to wrapped up in electronics, check your vacuum lines.

I just did this one my 2000 Blazer. Brake and ABS lights were coming on
intermittently. A local "brake repair" shop read codes and decided I needed a
new computer. $1300 for that. But the problem was a crumbly piece of
vacuum hose. I'm sure they would have changed that piece of hose - after
wiping off the brake controller... It cost me $3.65 to repair the problem.

 

Check your vacuum lines.

Replace anything that looks dry or crumbles when you bend it.

 

OK, got my abs module back today and reinstalled it. Had it rebuilt from cheapabs.com, because they were close and seemed trustworthy. Took it out for a drive and no abs and brake light on. Since it was intermittent problem, one has to hold there breath first.

 

I had the same problem as you. This is what I did and it should work for you as well. First, remove the entire unit off the bracket, or, get a mechanic to do it for you. After the pump and modulator are removed then take the modulator off the top of the pump. Under the modulator there is a circuit board. Buy a can of Contact Cleaner Spray and spray the circuit board and make sure it's dry afterwards. Do the same thing with the pump thus cleaning the valves that you or your mechanic will see. Probably best that a mechanic does it for you because after that's completed, the brakes will need to be bled. It worked 100% for me.

 

Yes brakes still work normal but with the lights the aas stops working and the same code co238 wheel speed mismatch comes up have replaced both cv axles both wheel hubs and sensors two front calipers abs controler, and controller harness and with all this code still pops up about 7_10 minutes after starting to drive every time and goes off with the key and waits another 7_10 minutes and returns. After all I have replaced car runs great just the light return ishue I have no shifting ishues but isnt much left to be at fault. Any help with this ishue would be greatly appreciated.

 

This is an old thread, but anyways....
What the usual or common problem is with the ABS is the solder joints of the connectors crack and make intermittent contact. The "fix" is to remove the ABS control module that sits on top of the ABS pump assembly, slice through the cover weather tight seal, then re-flow the solder joints of the connectors. Place the cover back, re-install into Blazer and see if the ABS lite stays off. If it does then just use RTV to reseal the cover and good to go.
If it does not, then further diagnostics is required with the next common problem being the relay solder joints or the relay itself.