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As SleeperC5 said, check your grounds. It could be a number of things such as your EBCM as well. I took mine in to the local Chevrolet Dealership and they said mine was a faulty EBCM. I inquired about the Goodwill Policy that had been talked about in length on the forum. Mine had started to mess up at around 30,000 miles and I thought it was just a hiccup. It would mess up once in a while and throw the codes. I would then clear them thinking it was just intermittent. Well when I took it in finally and told them the story, they said that the EBCM wasn't expected to last more than 80,000 miles. To me it sounded like a crock of sh*t but hey what can you do. So the moral of the story is if it is under warranty of any type, take it in and get it in writing that it was serviced.
I am posting the link to a great way of checking your grounds. It was started by Bill Curlee. Good luck and I hope it turns out to be a ground versus an EBCM.
But why would the ABS Light come on...Could have other problems besides the Door Module????
Well, it certainly seems like it, doesn't it?
Without a code, I doubt anyone will recommend simply throwing
parts at the car to see what fixes it. Assuming that the speedometer
works, and the ABS works even when the light is on, it sounds like
it's something intermittent, and you'll have to wait until it becomes
chronic before you'll get a code that you can trace.
In the disgnostics mode, all of the modules appeared and displayed "no codes" except for the LDCM?
If the ABS/TC light is lit up on your instrument cluster then there should be a fault displayed under the TCS or if your car is equipped with RTD there should be something there.
Just to clarify:
LDCM = Left door control module
TCS = Traction control system
TC = Traction control
RTD = Real time damping