[SpeZ]

Hello guys hopefully someone can contribute with some infos.

The car is a 2019 Camaro ZL1 SC750 Callaway with the A10 trans.
I drove yesterday on the autobahn and at ~186 mph with full throttle for the first time.
All of the sudden it crazy kicked me forwards due engine brake or the car itself braked? I heard a quick loud squeak which turned out it was caused by slipping belts due the hard braking. Revs dropped from like 6k to 2,5k.

The car sounded like it run on 3 cylinders and barely had power. CEL, stabilitrack and reduced power was on. I pulled over and restarted the engine, engine fired fine again but the CEL was still present. Luckily I had HPTuners and my laptop in the trunk, so I could delete the CEL and drive home.

Error Code;
0x7E8:P2101 - Throttle Actuator Control Motor Circuit Range/Performance (SES, Pedning, History)

I did a log drive all the way home, all seems running accordingly.

With VCM Editor I found in the Engine Diagnostics tab the P2101 Throttle Position Sensor.
There are two values for positive and negative, both are at 12% with the factory callaway tune. However the stock zl1 seems to have both values at 6%.
Description of it "[ECM] 4045 - P2101 Throttle Error Positive: Allowed positive throttle error before P2101 will set."

So my question is what exactly that function especially those percentages do?
I might just increase those values or might delete the CEL with this certain error entirely. Kinda afraid, because it seems to be a safety function to prevent a stuck throttle body.

At the end, the belts look a bit worn now. I probably should replace them. Please share me your thoughts.

oh yea and I just bought this car several weeks ago and drove only 250 miles yet. Total mileage is less than 6k miles.... So I would still have warranty from the seller.

[CalgaryZL1]

I would change belts for safety, reset like you already did and do another run to see if the car replicates? Call that first one a baseline.

[SpeZ]

Originally Posted by CalgaryZL1

I would change belts for safety, reset like you already did and do another run to see if the car replicates? Call that first one a baseline. And purp/bleed your supercharger coolant system. It’s probably not related, but something simple to do.

Really worried to drive that fast again. Its similar like the known money shifts, just in the other direction this cant be good for engine, trans and diff. Especially at those speeds. not funny at high speed in a small curve... I really hope the car itself used the brakes and the engine brake did only a small part.

I am checking the latest log over and over again, I just noticed the throttle body position jumps between 99,6% and 98% even tho the pedal stays at 99,6%. Compared with an supercharged SS from my buddy, that doesnt seem normal.

[CalgaryZL1]

Ok well the car does not have the technology to brake or jake like a diesel, but does have the ability to go into a safety limp mode instantly for a myriad of reasons. If everything seems fine driving around normal, I would slowly try and bring it up to see at what point the safety measures kick in.

[NiickySaz]

Yikes less than 6k an the pulleys look like that? Something looks rusted, IMO. If you were to adjust the percentages back to 6% would that do more harm than foul? Can you call Calloway just to make sure those are the correct values?

All in all, your tires might have slipped a bit but didn't notice. The wheel sensors might have just lost contact for a fraction of a second, reason being is Stabilitrack. My opinion on the matter(still does not answerfor the Throttle Position CEL). Hope you find out the root cause!

[SpeZ]

Originally Posted by NiickySaz

Yikes less than 6k an the pulleys look like that? Something looks rusted, IMO. If you were to adjust the percentages back to 6% would that do more harm than foul? Can you call Calloway just to make sure those are the correct values?

All in all, your tires might have slipped a bit but didn't notice. The wheel sensors might have just lost contact for a fraction of a second, reason being is Stabilitrack. My opinion on the matter(still does not answerfor the Throttle Position CEL). Hope you find out the root cause!

well, the belts cleaned all the pulleys when it slipped. :/
In my understanding the percentages are thresholds how sensitive the error gets triggered.

Gonna contact the seller to swap belts (if they pay) and simultaneously try to contact callaway for infos. Maybe they know a cause.

Edit: oh yea and I can pretty much rule out the traction loss at that speed. Road surface was perfectly flat and dry. It must have triggered when the limp mode kicked in. Because when the limp mode turned on the torque instantly got reduced by the factor of 4,3x at that speed and accelerator %.

[N Camarolina]

I haven't done those kind of speeds, but can attest that even at 140mph (at the track) when you lift off the gas the wind resistance is high enough that the decrease in speed feels like mild braking.

I second the idea of approaching that mph limit again more gradually so if there is a computer imposed limit, you run up against it more gently.

[SpeZ]

Originally Posted by N Camarolina

I haven't done those kind of speeds, but can attest that even at 140mph (at the track) when you lift off the gas the wind resistance is high enough that the decrease in speed feels like mild braking.

I second the idea of approaching that mph limit again more gradually so if there is a computer imposed limit, you run up against it more gently.

It felt like it threw an anchor. Within milliseconds I first thought my tire popped or 1-2 pistons flew away. You can't compare lifting off the gas with getting the torque instantly restricted by 4,2x.
Letting of the gas uses smoothing functions and doesnt cut the power.

Having a Speed limit was also one of my thoughts too. But stock zl1's run like 196 mph. and my car papers states a top speed of 202 mph.

[arpad_m]

Originally Posted by SpeZ

It felt like it threw an anchor. Within milliseconds I first thought my tire popped or 1-2 pistons flew away. You can't compare lifting off the gas with getting the torque instantly restricted by 4,2x.
Letting of the gas uses smoothing functions and doesnt cut the power.

Having a Speed limit was also one of my thoughts too. But stock zl1's run like 196 mph. and my car papers states a top speed of 202 mph.

There is a speed limiter, but it's set to 206 mph in the ZL1, plus it kicks in smoothly, very much unlike what you experienced, so that could not have been it.

Alas, I can't help much more... I suspect your accelerator pedal might have an issue at full throttle, but that's just a guess. I would not adjust the error margins in the tune, even 12% is a stretch, it's already a huge error to just ignore.

[Future1LE]

Did OP get this issue fixed? I have a similar issue with mine. Under WOT at around 6.3k rpm the car would go into limp mode and give the same code P2101. It will sound like crap coming to a stop. Had to pull over on the shoulder, and reset the battery. Once I turn it back on, cel is gone and drive normal again.

[SpeZ]

I actually had the same issue again last week when I test drove my oil cooler. ;(
It was fine now for like 10 months...
When I tried to overtake two cars under WOT, it instantly went into limp mode when I was side by side with the first car, however I could barely overtake the second car upfront before oncoming traffic approached.
No power at all and I was slowing down until I stopped in the middle of nowhere. It was really embarrassing, those I overtook, had to overtake me again :/

Luckily I had my laptop ready to quickly delete the codes and continue driving.
But back to issue.
After I had the issue the first time when I created this thread, I installed a brand new and bigger throttle body (LT5).
I also got it tuned by jannetty and was happy to got rid of the problem.

Regarding the sound of the engine, it's because of the reduced power mode, it pulls power by igniting fuel earlier.
I enforced my reduced power mode a lil bit, to decrease the engine and drivetrain shock when its happening again under high speed.

My next step is to change the throttle error tolerance from 6% to like 30% and if I ever get that issue again, I will disable the triggering of the code.
In fact, in my callaway tune it was at 12% but it still happened. Default is usually 6%.

[SpeZ]

Originally Posted by Future1LE

Did OP get this issue fixed? I have a similar issue with mine. Under WOT at around 6.3k rpm the car would go into limp mode and give the same code P2101. It will sound like crap coming to a stop. Had to pull over on the shoulder, and reset the battery. Once I turn it back on, cel is gone and drive normal again.

Let me know if you got new infos about it.
I changed the allowed postive error from 6% to 30% and it came twice at WOT today....
Next thing might be to swap the throttle body harness.
Luckily I could log the drive when the error came the second time. So maybe we can find the reason for it

[Future1LE]

Originally Posted by SpeZ

Really worried to drive that fast again. Its similar like the known money shifts, just in the other direction this cant be good for engine, trans and diff. Especially at those speeds. not funny at high speed in a small curve... I really hope the car itself used the brakes and the engine brake did only a small part.

I am checking the latest log over and over again, I just noticed the throttle body position jumps between 99,6% and 98% even tho the pedal stays at 99,6%. Compared with an supercharged SS from my buddy, that doesnt seem normal.

Going to check if my Throttle position sensor has been changed to 12% yet or if it is still set at 6%.

[SpeZ]

Originally Posted by Future1LE

Going to check if my Throttle position sensor has been changed to 12% yet or if it is still set at 6%.

Update:
Since last time I set it back to 6% it did not happen again.
I also tracked it last week. So far so fine.