i will say i had a 08 2lt that had the same kinda probs u say yours does it would run great at times then the gauges would go crazy the driver info would say every thing is bad and i did every thing i could as to what others said , i finaly had a gm tec look it over and he found the abs Brian was shorting out and driving the electric system crazy as soon as i change it all the probs went away and we reflashed the brain to my vin and the abs light and trac control all work again my buddy has had it now for over a year with no probs now , again just my 2 cents as i have another one now with a bad abs Brian

 

C0550 means there is an internal fault in one the control modules. Oldblue's glasses are malfunctioning again, he sees c0050.
U0073 means something similar.
All of the others are related to that.

It may be that the ECM connectors are fouled up, we have heard similar stories solved by cleaning them and stopping oil migration creeping up the harness.

 

No, read it again C0550, and the link I posted. C0550!
Thanks for being helpful

 

Well. I guess the new question is, whose glasses are really malfunctioning ?...............

 

The cobalt link that oldblue provided is for c0550. But it's a very short thread. There's a "related thread" that immediately follows it, that the fix was new hubs. Maybe not so closely related, maybe more like a step brother"s in-laws.

 

From Mitchell OnDemand



C0050 is RR wheel Speed Sensor.

The "Control Module" involved could be any one of the modules on the CANbus. Here is one of many "diagnosing CANbus" youtubes:

 

Oldblue got fooled by the "related threads" in his link to c0550, the related thread did not have c0550 cited in it. Easy to do on a tablet/phone. The thread linked actually says what I said.

 

The Mitchell on Demand post, is vague at best.
Alrighty then, I reread the last post#6 , and the rest of that link , nothing mentioned about P0050, so fine, could be a bum steer in that thread,carry on, I’m out.

 

I only posted a bit of the Mitchell article. The point being it could be any of the modules and further testing is needed to find which one. And figuring out what exactly is the cause of the checksum error, which is one of those "scary computer" things.

 

Thanks for the response. When you say the brain what do you actually mean the sensor or what. I will need to get a schematic to learn more about it. It sounds like I will need to go to my dealer even if I replace the abs brain it will need to be programmed. I am going to go over some stuff tomorrow on the car and do some more research on the net. Thanks