Ok dealer says I need a new CAT cause it got oiled up and is causing misfire codes which in turn is causing Traction System issues.

CAT is going to be replaced but there are none to be had now.

Trying to find out if C6 and C6Z06 CATS are the same as someone will loan me a C6 for my Z06.

TECH2 show CATALYTIC CONVERTER CODE and MISFIRE CODE. Is the ECM actually reading that the CAT is bad or just the 02 sensor?

Can I circumvent the code by gutting the CAT and cleaning the 02 sensor while I wait for my new CAT to arrive.

Lastly can engine damage occur from running car like this ??

Sorry if anybody saw part of this issue in another thread. But I'm trying to get the codes and service traction cleared up ASAP as the CAT may be quite some time before it arrives


DH

 

It's the rear O2 sensor that shows if the cat is bad or not. If you gut a cat it will surely throw a code for and inefficient cat.
C6 and Z06 cats are totally different.


DJ

 

How many misfires does it show, is it the same cylinder, that will destroy a cat.

DJ

 

I blew my motor. So it is assumed that oil fouled my CAT. I now have a new motor. I am getting DIC messages of "Service Traction System", Traction Dash light intermittantly. I have a steady CEL.

Dealer is saying the CAT P0430 is throwing the Misfire P0300 which is throwing the Service Traction System. No one has said how many misfires or where they might be coming from .... thought it was a general condition.

I am waiting for GM to deliver a new CAT but none are in the supply chain right now.

So I am trying to see if there is a workaround ... maybe just the 02 sensor needs to be cleaned ????

And I want to know that I am not hurting my new motor. I am planning on taking it to an HPDE in 10 days !!

Thanks for any help ......


DH

 

My engine had number one cylinder fail so they replaced the left side cat since it had a lot of debris go through it. I told them the right side one was probably gone since coolant was flowing out of it when the car was put on the flat bed. Nothing like 220 degree coolant being dumped into a 1300 degree cat to ruin the cat's day. Within 5 blocks of picking up the car it threw the P0430 code. Car is at shop getting the right side cat replaced today. I didn't get any misfires. Not sure how that sensor would cause a misfire since all it does is report the condition of the cat. The Number 1 sensor in front of the cat could potentially cause a misfire but I don't see how any reading coming from the Number 2 sensor could cause a misfire since the info isn't used to control fuel mixture except when running a short test to see if the car is good. The ECM runs the test by varying fuel mixture and comparing the readings coming from both sensors. If Number 2 doesn't follow Number 1 properly then the cat is bad or the sensor is bad.

From the Service Manual:
A 3-way catalytic converter (TWC) controls emissions by converting hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide (CO2), and oxides of nitrogen (NOx) into nitrogen. The TWC also stores oxygen. When the listed idle conditions follow the listed driving conditions the Catalyst System Efficiency test will run. The engine control module (ECM) monitors this oxygen storage capacity by comparing the pre and post-catalyst oxygen sensor signals while adding and subtracting fuel during specific idle conditions. The ECM compares the pre and post-catalyst oxygen sensor signals to determine if the oxygen storage capacity of the catalyst is degraded.

Bill

 

So the problem from the other thread was the cat ? If its really going to be long to get a cat I'm sure you could buy a used one cheap as so many people switch them out when adding headers. Maybe check the parts for sale section.

 

By the way, I would give you mine for free since I installed high flow except this what they look like after a bad wire caused a miss.

 

No, they are not the same

First, the standard is a donut 2 bolt flange and 2 1/5" pipe and the Z is a flat 4 bolt design and is 3" dia pipe. The picture above is a LS2/3 cat

Why don't you just turn off the rear 02s until the cats come in. It can be done w/o changing the tune. Just upload your tune, turn off the codes and reinstall your stock tune.

BTW, the P0430 won't cause p0300 code but a P0300 can cause the P0430 so they need to find out why you are throwing the misfire code.

A P0430 generally means that the cat is failed. To verify, idle the engine and watch the voltage readings from sensor 1 and sensor 2 of the affected bank. If the cat is failed, the #2 sensor will pretty much follow the front sensor.

 

Bill

I am getting the P0430 code as well. I'm sure it means the CAT needs replacement.

I had the codes read and the P0300 only registered once. And so quickly it didn't show which cylinder. My guy says it could have been anything, even water in the fuel.

Supposedly, anything amiss can cause the Traction System issues even CATS. But you don't seem to be getting them so now I'm worried that there may be something else going on too.

How long did you have to wait for the CAT. My dealer doesn't even have a date yet


DH

 

Thanks, I have a couple of guys that will loan me one till my dealer gets mine in. So when I get it installed next week we will see if my Service Traction System warnings go away. I sure hope so !!!


DH

 

Glen

Thanks for the technical info. Too bad I don't still have HPtuner as I did for my C5. Its been awhile but I thought you have to rewrite the tune to turn off 02 sensors. Anyways, I don't have a tuner close by.

As I said above to Bill. I just found out today that my local mechanic determined that there was only one P0300 and it didn't even register to a cylinder so he said its not an issue.

In your experience to you think the P0430 could somehow trigger the Service Traction System issue I'm having ???


DH

 

No, there is no relation and I would be very surprised to see the P0300 cause it as well. More likely a speed sensor, column sensor or EBCM

 

I got the cat low efficiency code last year, a few times. Re-set it twice, third time the dealer updated the tune (per GM guidance) to widen the parameters that set the code. No code since. 09ZO6, lots of others have had to get the same fix.

I also don't think the cat code is related to the traction control code.

Hope you get it figured out...

 

Well thats what I thought but others say since everything is so interrelated that it is possible. I was thinking speed sensor but there are no other codes.???????????

Wouldn't you expect other codes ???????


DH

 

I had the reflash done years ago

I blew my motor which oiled up the CAT !!!


DH

 

which side is that? i may be interested in the O2 sensor?

 

Sorry. O2's were reused with my new system.

 

Codes that are related to controlling engine torque will cause a TC failure. The ECM detects the failure sets the code and then notifies the EBCM it can't perform its part of traction control and TC gets turned off.

The various failures have patterns. If the patterns don't show up then that particular failure isn't causing the problem. Speed sensor will cause ABS/AH/TC to fail not just TC, steering sensor will cause AH to fail.

There are a couple of ways a bad cat could cause a situation where the ECM couldn't control torque but more than likely another code will show up and the car wouldn't run very well to boot.

Bill

 

The DIC message is "SERVICE TRACTION SYSTEM", no messages about AH. I had my local guy clear the CEL and p0300, p0430 codes tonight. The soon as I get the car over 3K rpm for a few seconds the CEL, TC light and DIC "SERVICE TRACTION SYSTEM" flash, stay on for a couple of seconds and then go away. The p0300 was not bad enough to log to a cylinder. He says the CAN system can do this due to the CAT when the different systems don't communicate properly. He found history codes backing up this contention (c0561 and c0242)

Interestingly, when the DIC was reading SERVICE TRACTION SYSTEM I was able to spin the back wheels while in COMP MODE. I thought it would default to traction ON. I hope the same is true about AH since I am going to the track next saturday. So the DIC can say what it wants and the dash light can go crazy as long as the car stays in COMP MODE.

New CAT goes in next friday, I'm keeping my fingers crossed I will have no issues on track


DH

 

Finally go this resolved after driving for a thousand miles with the damn CEL and Service Traction System coming on when ever I went over 3K RPM.

Replaced the TPS after stall and very rough start but CEL/DIC continued although the car ran great.

Replaced the passenger CAT which coded out as bad but CEL/DIC continued.

Finally miss fire code was determined to be a bad spark plug. No more CEL/DIC.

Thanks everyone for your input.


DH