That's what the computer said today. But 6 weeks to look at my car
Ok so this last year had take car to Chevy 8 times thy said it was intake boot,then intake hose, then it was throttle body connector, then it was throttle body, then it was we can't figure it out then said it was the cat then the computer 😂🤣 replaced all these parts and no resolution so , the car will be driving normal no lights then it feels like the front left brake is grabbing and trying to slow car down and the the traction light turns on then random miss fire and sluggish car won't accelerate so I have the print out from a dealer today of the dtc any help would be appreciated I am so tired of them pushing me away 6 weeks latter an all this crap the dealership had my car for 2 months and no fix.

 

It basically says your battery is low and somebody messed with your radio antenna; probably an after-market radio install, and somebody messed with the OnStar.
And you RF wheel hub is either bad or disconnected which is the explanation for the odd braking.

I don't know why all of those other parts were replaced. Why would you be taking it to a Chevy dealer shop?

 

X2 what Don said. I just had a hub replaced for exactly the same issue.

When a dealer is throwing part at it it's time to run in the other direction. The car is out of warranty. No reason to be at a dealer with it. Find a local shop with a good reputation and have them look at it.

 

So here's another part of the story.
https://www.chevyhhr.net/forums/prob...p-p0420-61340/

 

Yes I had issue for a year with it I went to a dealership because original throttle body was messing up so needed to be reprogram well along with that they said other things so I went to a different dealership and so on and back to the dealership 5 times makeing them give me credit to the repairs that did not fix the issues so all in all I'm still back at issue one so now I trying to get my last 400$ back for the computer witch did not fix the abs or the random miss fire so I replaced wheel hubs before but may be a fulty one it's just random and miss fire only happens after the brake grabbing and the traction control light stays on so maybe that had a issue to do with the random miss fire?

 

I had a hub replaced in the summer of 2018. This summer the same hub was giving the Wheel Speed Sensor error. The shop I used got a new one under warranty but I still had to pay the labor. So a faulty hub is not out of the question.

As Don said, check your battery. After shutting it off and waiting 10 minutes a volt meter should read 12.7 volts or higher (some sources say 12.6). Anything lower and your battery needs to be replaced and is probably the cause of some of your issues.

 

The misfire causes the traction control and ABS light.
The C0561-71 can also cause the traction and ABS lights; it means that there is either a bad wire in the EBCM connector or it never got programmed. It is a serial data failure.
The misfire is what killed the cat.
No shop should EVER replace a cat without at least warning the owner that they must fix whatever caused the failure! Cats don't just up and fail.
What does the throttle body "messing up" mean?
What computer did they replace?
I think you ran into a bunch of the laziest mechanics in the world.

 

I wasn’t aware the throttle body replacement required programming.
a bad ground wire can cause many issues,
running down the road and a pothole or branch can mess up the hub and ABS sensor,
dead cell in the battery will cause most of these problems.
swing by your local parts palace and have your battery load tested, and the alternator tested.
check the abs harness moisture is the enemy and rodents tree branches

 

So all this started last year I had a throttle body code can't remember the code so I purchased new throttle body well could not get it to work so took old one an new one to dealer they installed old throttle body and told me it was just the throttle body conectotor well that still left me with a traction control error thy said it was due to steering wheel position sensor so I took the car to a buddy and did a 4 wheel alignment and re learn the steering position . Fixed that code error never fixed traction control issue so took to a different dealership they said well ohh it's PCM throwing random codes and dash was going crazy so replace that and still have the same issue now traction control so I replaced all 4 hubs I will warranty and try replace the right hub because might fix issue and Ill check the voltage it ran fine for ever and just out of the blue one day it started all this thank you guys for your help i just tired of dealership and local shops can't figure it out witch I did take it to two local shops they said dealership they can't figure it out.

 

Now you have got a bunch of stuff tangled up. You ran into places that think you have deep pockets. I would check the connector for the front right hub, unplug and replug.

When the traction and ABS light are on get the ABS codes read.

Was the traction control ever fixed? I don't understand if it was fixed then came back or what.

Right now the only code you have is for a bad serial data connection between the EBCM and the ECM. And the misfire that is unrelated; a compression test is called for.

All of those other codes are "history" They don't mean anything to you.

And take a breath your prose is a bit hard to follow.