Join Date: Aug 2018
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I know this is beat like a dead horse, but hear me out. But this one is different I feel like. No codes for TB or Pedal. It's a 2012 impala v6. Basic version. 167k.
Bought the car doing this, thinking I could fix it easily. It has kicked my ass. Originally, a quick google told me it was the throttlebody. There was oil in the intake for some reason, so I cleaned it out and out a new MAF, EVAP sensor (had a code for it), and throttle body. Put it all in and was good to go. I got cheap, put the old throttle body back on curious if it was the MAF or the EVAP sensor, and it still ran fine with the old throttle body on. I returned the throttle body and got my money back.
The next day, driving to work, I noticed at WOT, or really anything past 1/4 throttle, the car would cut out/jolt it's way up in the RPMs and then BAM, service stabilitrac and reduced engine power. I shut the car off, restart it immediately, and the service stabilitrac and reduced engine power is off. As long as I'm easy on the gas they stay off and it drives fine. (Originally, they would never shutoff and it would stay in the limo mode). But, if I mash it to leave a red light anything past 1/4 throttle it does it again.
I've read about the Throttle body, speed sensors, and gas pedal. All of which seems to throw a code, either letting you know it's a TB or TPS problems, which wheel sensor, etc.
It has no codes for that.
Upon reading more about the car, I notice this model had a catalytic converter recall as well. From reading others posts with converters, it seems a few has had the same jolting/cutting out issue at WOT or whatever before the REP and stabilitrac lights kick in. I also have a code for P0420 which seems to be commonly the catalytic converter. My scan tool will read PIDs but I have no clue what I'm looking at there.
All the other codes from when I first got the car are back too.
PO192, P0420, C0242, and some misfire codes are popping up. There may be some I left out, but I feel the misfiring and such are just from the REP, because it runs and sounds smooth with the exception of the items mentioned above.
Nothing mentioned the TB, Speed sensor, etc.
Does the cats cause the REP and service stabilitrac issues as well? Did anyone else have these random codes when the culprit was the pedal or TB? What has me thrown off is how originally it would always be on. Also the jolting under heavy pedal was said to be cats in another post, but it sounds and smells fine, and at easy pedal no lights or any issues at all..