[SheetzNo.1Fan]

Hey all, I'm at a complete loss as to what is going on with my 2019 2SS 1LE. 99.9% stock, has a cold air intake. No tunes. 23,000 miles.

It randomly started having a misfire one night after an easy cruise session. It would throw codes for bad O2 readings (too rich and too lean), "Service Stabilitrack" and "Service Rear Axle" would come up on the dash, and it would put itself into almost a limp mode.

I gave it to a Chevrolet dealer to look at. They replaced fuel injectors, O2 sensors (all of them), ECM, and spark plugs. They said it ran fine for a few minutes but then started running rough again and they noticed that one of the upstream O2 sensors was dropping out randomly.

They have had the car for FOUR weeks. I really need to hear from someone that has had a similar problem like this or someone that knows more about Camaro specific problems than I do.

Thanks


OBD codes before taking to dealer.

U0401-71
-ECM invalid data

U042B-71
-CCM invalid data/lost communication

P0157
-Bank 2 Sensor 2 low voltage

P0175
-Rich condition Bank 2

P015A
-Delayed O2 Bank 1 Sensor 1

P0430
-Bank 2 catalytic converter inefficient

P0300
-Random misfire

P0132
-Bank 1 O2 high voltage

[SS_Don]

A bad battery can cause random codes to pop up. How old is the battery?


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[SheetzNo.1Fan]

New battery installed right after issue began. Did not improve anything.

[bishopts]

Change the oil. The oil might be full of fuel from the injector failure. Also the high pressure fuel pump could be leaking fuel into the oil. Ive seen that on a few of the 6.2 trucks

[SheetzNo.1Fan]

The dealer still has it. I changed the oil soon after it started running rough and didn't notice a smell of gasoline or a drastic change in the viscosity. I did change the injectors before I took it to the dealer and primed it several times and there wasn't any leaks from the high pressure fuel pump.

[Z28GTOSSMike]

I had a similar problem with the O2 sensor going bad and it killed the catalytic converter on one bank. After the second O2 replacement I replaced the converter and haven't had any further problems.

[bishopts]

You could try a different dealership. Maybe one that has a tech that knows what he is doing.

[SheetzNo.1Fan]

Originally Posted by Z28GTOSSMike

I had a similar problem with the O2 sensor going bad and it killed the catalytic converter on one bank. After the second O2 replacement I replaced the converter and haven't had any further problems.

I had a code for a bad catalytic convertor on bank 2 for a brief moment.

[Patriot Motorsports USA]

Originally Posted by SheetzNo.1Fan

Hey all, I'm at a complete loss as to what is going on with my 2019 2SS 1LE.

It randomly started having a misfire one night after an easy cruise session. It would throw codes for bad O2 readings (too rich and too lean), "Service Stabilitrack" and "Service Rear Axle" would come up on the dash, and it would put itself into almost a limp mode.

I gave it to a Chevrolet dealer to look at. They replaced fuel injectors, O2 sensors (all of them), ECM, and spark plugs. They said it ran fine for a few minutes but then started running rough again and they noticed that one of the upstream O2 sensors was dropping out randomly.

They have had the car for FOUR weeks. I really need to hear from someone that has had a similar problem like this or someone that knows more about Camaro specific problems than I do.

Thanks

Your Dealership is also at a complete loss as they simply do not get the training needed to deal with the complexity of these cars. I had to learn everything by immersing weeks of testing at the track alongside those who were tasked with developing these systems and trying to break through my own reservations of trusting the technology to punch through the mental difficulties and the physical ones when something went wrong!

The typical response for the menu alerts you received is indeed the battery, in most every instance, but there are other triggers for the same alerts. What you also need to look for are the suspension travel sensors to be sure they are all connected and that they are all within the same range of adjustment when the car is sitting level. IF, you have a PERFECT wheel/tire/suspension alignment and I mean a ZERO thrust angle with at least 1/8" Toe-In, you CAN adjust these sensors to impact the torque vectoring of the eLSD. The image below is from the Patent GM submitted to obtain controlling manufacture of the eLSD used in the Camaro, Corvette Z06 & ZR1 vehicles. You can see there are dozens of sensors all being utilized JUST to keep your car focused exactly where you POINT IT. The problem is... these sensors also impact the tuning of the engine, can cause random misfires as the ECU is also taking road surface data to adjust torque output. This sometimes can come across as a misfire when a sensor is failing and making an intervention without a clear cause for it.

On Jeremy's Pikes Peak car, we were getting the same alerts you are, but also had an issue where the right rear tire would break free and just spin like an open differential. This all came down to the front right plastic link on the control arm's travel sensor broke free and fell to a fully down position.

If your SS1LE is equipped with the eLSD, I would suggest looking for any indication of wheel speed or angle sensors are outta-whack... make adjustments as needed, if any and also add a ground cable to the engine from the chassis by the fuse box. We offer these cables, ready to install with marine-grade silver-tinned copper stranded wire, copper ends and sealed with heat shrink. This cable offers better starting when hot and better ground path for all electronics, including your battery to deal with all the data necessary to operate a clean CanBus of information.

Hope this helps!

[m6-lt1]

At this point I would try replacing the cat on the side where the upstream O2 sensor is acting up. It is not unheard of for cats to go bad on these cars. Also you have an 8 year 80k mile emissions warranty for make sure you don’t foot the bill on the cat replacement.

[SheetzNo.1Fan]

Originally Posted by m6-lt1

At this point I would try replacing the cat on the side where the upstream O2 sensor is acting up. It is not unheard of for cats to go bad on these cars. Also you have an 8 year 80k mile emissions warranty for make sure you don’t foot the bill on the cat replacement.

I called this morning and asked if they would check it with a bore scope.

[ctrlz]

I think they should drive this car and do some live data logging. Is there a real pattern to what's going on, or is it more random? Random might mean a loose connector or wiring problem.
This is low miles with no significant mods, and they already threw parts at it.
Bad converter at 23K miles? doubt that.

EDIT: Bad MAF connection after the CAI install? Intermittent MAF can give you O2 sensor codes.

[SheetzNo.1Fan]

Originally Posted by ctrlz

I think they should drive this car and do some live data logging. Is there a real pattern to what's going on, or is it more random? Random might mean a loose connector or wiring problem.
This is low miles with no significant mods, and they already threw parts at it.
Bad converter at 23K miles? doubt that.

EDIT: Bad MAF connection after the CAI install? Intermittent MAF can give you O2 sensor codes.

They have been driving it to look at live data. They had to send live data to GM and they recommended that the ECM get replaced last week. The original testing that they did showed that the injectors were bad so that was the first thing that got replaced then they saw all the O2 sensors because the readings were adjusting the fuel trims too much. They did update me today and said they found a faulty connection with a sensor and had to drive it to see if it would start missing after correcting the connection. They've inspected the harness and that was all they found.

[SheetzNo.1Fan]

UPDATE

Called the dealer and they said the misfire is gone but a code for the catalytic convertor came on and nothing else. Asked about the emissions warranty and they're looking into it while I come pick it up.