I did a local Auto X event this weekend and during my runs the driving modes would switch from track mode to touring mode cutting power and changing my suspension setup. I experienced a throttle cut coming out of a corner an think that’s when it was happening. Is there any way to keep it in track mode? This was affecting my times although only a few tenths but there was only about .750 of a second between 1st an 3rd me being in the 3rd position behind a Tesla Plaid and a C6 Z06 7.0.

 

I would look for some sort of issue with the TPMS, or another intermittent failure. If the battery in one of your TPMS sensors is getting low you will get intermittent readings out of the sensor and that can shut down Track Mode and put you into Tour Mode. Intermittent stability control issues can do the same thing along with intermittent engine codes that affect the engines ability to respond to commands from the EBCM (stability control controller).

Bill

 

Bill,
I would agree to a degree but only does that during Auto X an only in track and I talked with a 6th Gen Camaro owner an he stated his did the same thing. Was wondering if I left it in manual mode and use the paddles to shift.

 

What you are experiencing isn't normal operation. Something must be happening to cause the system to automatically switch back to full nanny mode. Those things are TPMS Sensor cutouts, wheel bearing issues, stability control system issues due to steering, yaw or lateral G sensor cutouts, or intermittent engine code issues that cause the stability system to shut down.

If the throttle cut you noticed was the instigator of the shut down then you may well have an engine ignition issue. When the engine is misfiring the ECM will send a signal to the EBCM that tells the EBCM that the ECM can't control the engine properly due to an issue. That message from the ECM to the EBCM will shut down track mode instantly since the EBCM issues commands to the ECM to adjust engine torque during PTM operation.

Bill

 

Bill,
What your saying makes sense but the car runs flawless any other time. Now here’s what Camaro guy told me “it’s because Auto X it’s short burst of on and off the throttle and the car apparently doesn’t understand or like those conditions, so that’s why it’s jumping back”.

 

The drive mode electronics don't give a damn about G load changes due to sudden changes in throttle, braking or direction. However, a TPMS error or a misfire can occur during an autocross and may not be noticeable while you are busy hustling the car around a course. I am just relaying what the system does when certain errors occur. Intermittent failures can be unnoticeable to humans but the electronics see and react to them. How old are your TPMS sensors. As they approach end of life they tend to get flackie and will fail while the car is being pushed hard and when you get to someplace where you can check things they behave just fine.

Bill

 

Yeah your explanation makes good sense, so my current sensors are the original to the car an it was built in 16 sometime an delivered in late 16.
What’s the best way to see if the are at the end of their life and I can take it to the shop and have it checked for a mis-fire.

 

Bill I am usually with you but I have never seen an intermittent tire pressure sensor they either work or they don’t. Either way the TPMS system can’t change the drive mode.

Blue are you saying the mode indicator on the instrument panel actually changed? We’re you in regular track mode or were you in one of the sub menu competition modes?

 

Regular track mode I haven’t gone through the sub menus yet. An yes I’ll start in track an by the end of the run I’m in Touring an I have to remind myself to reset it. An pretty sure I’m not bumping it with my right arm.

Would a Range device cause any issues? I was reading through another post and forgot that I had one.

 

The TPMS sensor can fail intermittently when the battery is getting low. Once the failure occurs it will last through that ignition cycle. The first time I ran into the intermittent TPMS issue was with my C6Z that started having the issue while running in an HPDE at the Glen. While on track I heard a dinging sound and the car switched from all nannies off to full nannies on and I had a 0 pressure tire indication. I pulled off the track and waited for the session to end and for the track workers to get to me. When they checked the tires none of them were flat. When I got back to the garage and restarted the engine the TPMS problem had disappeared and there was a tire pressure reading. When this happened a few more times I realized I had to replace the sensors in my track wheels. One thing I noted is the sensor didn't fail when driving on the street only on the track. I attributed this to the fact the sensor gets a lot hotter in a tire that is being stressed to the limit on the track.

I saw this thread and checked the FSM to see if the C7 reacted the same way as the C6 and found that the C7 does react the same. If there are no sensors at all it will let the car run. However, if there are sensors and one of them reads a low pressure or 0 pressure the car will switch the drive mode to Tour with all of the nannies on.

I had to search through the FSM to find the correct info again but this is what the FSM indicates happens when the TPMS senses a low pressure:



Bill

 

Ok so im crystal clear, we are talking TPMS batteries or main car battery???