ECM is the engine control module. It's under the hood, probably near the fuse box. On an LNF and LSJ it is. BCM is body control module. On your car it should be passenger side of the console. Not real sure what a PCM is, exactly.

 

ah, here you go

http://www.***************/forums/pr...locations.html

oh, for gosh sakes. yo ur cobalt.com/forums/problems-service/29979-bcm-pcm-locations.html

 

Ok so what do I do about the P0856 TRAC control torque request code

 

Maybe the max torque tables in the tune need looking at?

 

Can't be the tune....its perfect.....lol just get that o2 sensor taken care of then go from there.

 

I already have it figured out. Never said my tune was perfect. I just enjoyed it.

 

So what was the issue or issues?

 

^ what he said

 

Now we aren't sure. It's back to my car possibly having a mechanical issue.

 

 

Lmao!!!

 

Just bring the car and we'll fix it. Lol. You replace o2 yet? Ac delco usually has stuff cheaper than dealership

 

top BCM bottom PCM, TCM is behind the PCM, smaller module.

Did all of these codes appear at once, or is this a slowly developing issue that never got corrected? I know you read my post when i first got my car i had 13 codes on my computer, it needed two VVT solenoids, a map sensor, and an o2 sensor and fuel injectors and spark plugs to get it back to normal from just a general lack of maintenance. But your car seems to be showing a communication error.

It's possible that your PCM is bad, but on such a new car i tend to steer away from things like computer failures unless you had a corrupted tune file installed by accident. BCM's are 137.99 new on rockauto.com , id try to find a used PCM on ebay see if you can spend under a 100 bucks and start from there. Assuming you dont find any blown fuses or frayed wires near the connectors. (its unlikely that you have a bad harness unless its rubbing near a turn or an open portion of the harness)

If replacing those doesnt fix the issue then you should try replacing the two biggest components on that failure list. The CKP is probably the single largest issue there that can cause multiple CEL's. The VVT solenoids can throw all sorts of other issues related to airflow and traction control.

 

http://vimeo.com/channels/aamco/49695433

 

Ya the guy looking at my car has some solenoids that I can have. He's still trying to find the problem.

And I just happened to scan it and they came up. 2 codes where in one section if the scanner and then the other code were on a different part of the scanner. They weren't together.

 

When I was still getting tuned by my first tuner, his first and second tune was good. No problems. Then I decided to get tuned for 93 gas. Went to his house, he retuned for it and then as soon as I left the problems started. The first thing that started happening was the rpms were bouncy shifting into gears. Like when the rpms are rising and are about to shift into a gear it should be a smooth climb. Mine bounced on the way up and after it was in 4th they would bounce around 2k. And then the bogging and hesitation started. It's been happening ever since I left his house from getting tuned for 93.

 

It's possible you have a corrupted tune, ive ran into several issues tuning with HPtuners where it would go into recovery mode from either a voltage drop or something. Happens ALOT if my headlights are on. You might need to verify that you have sufficient battery voltage at key on when writing the tune first, then re-write the ENTIRE VCM file, not just the calibration.

 

And another thing, when I'm driving about 15-20mph in my subdivision, the rpm will be around 1k and it just bounces up and down. Like it revs or something. I can't probably get a video of that but not a video of the bog hesitation. You can really see it in a video, you can only feel it and kinda hear it. I made a 0-60 yesterday and when I floored it went to about 3.5k it liked stopped and low traction control came on and then the rpms kept going.

 

I told you to try it with L.

 

IMO it really sounds like a corrupted PCM, does your dash say ENGINE PWR REDUCED?

 

I'm not going to constantly drive in L I'm not talking about launching. I'm talk about cruising in my neighborhood. I stay in second the whole while I'm driving in my neighborhoods

Nope. I've never even gotten a CEL. My abs light comes on sometimes though. And low traction when I floor it

 

1377017964_zpsa6bbe43a.mp4 Video by alissa8127 | Photobucket

 

have your guy rewrite your stock tune, the entire thing, not just the calibration, then upload the new 93 octane calibration again.

 

Don't think its that spawne. When I gotna corrupted tune it wasn't showing codes but running horrible. Worse than how hers runs lol

 

Before I'd go with corrupted PCM I'd go with intermittent communication issues with the TCM or BCM.