Deleting/bypassing Tpms
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,330
Likes: 57
Deleting/bypassing Tpms
What’s the deal on c8’s? How to ensure that no matter what, never, ever can any module on the car ever take any action based on a Tpms signal or lack thereof? Particularly on z06.
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,330
Likes: 57
Instructor
Joined: Dec 2021
Posts: 234
Likes: 147
Also, why wouldn’t you just add TPMS to your new wheels.
The z06 isn’t tunable yet so you can’t tune it out.
You might be able to throw 4 sensors in your glovebox if you don’t want them on your wheels for whatever reason
Sr.Random input generator
Joined: Jan 2008
Posts: 7,798
Likes: 2,229
From: Sammamish, WA
(1) As far as I know, if you don't have TPMS in any wheel, or if you have it in all wheels, you're OK. If you have it in only some of the wheels, then the car will think you might have a flat/safety issue, and will rein in stability control.
(2) I seem to remember being mentioned here that there is a special combination of buttons you can hit to disable TPMS. If you sarch for it and find it, you can share it here : )
(2) I seem to remember being mentioned here that there is a special combination of buttons you can hit to disable TPMS. If you sarch for it and find it, you can share it here : )
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,330
Likes: 57
i dont really want to elaborate just yet. Suffice it to say that the car is undriveable and potentially dangerous without tpms in the 2 front wheels, and that was true in any mode or all nannies off. Put the tpms in the other wheels (none of the dealers had any!?) and problem went away.
Sr.Random input generator
Joined: Jan 2008
Posts: 7,798
Likes: 2,229
From: Sammamish, WA
Yep, indeed looks like you had TPMS in only some of the wheels, in which case your car will think you're running on flat tires. You need to either remove all TPMS sensors, or have all 4 of them.
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Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,330
Likes: 57
The dangerous and inexcusable defect is what the car does with that information and what it will do to you if any of the four cheap (probably chinese) $40 sensors ever fails to deliver a signal that makes the bullshit modules happy. So if you turn the wheel, Hal just starts jabbing the front brakes so hard it barks the tires, on and off, repeatedly. The car can be fun and could be so good, but anyone inside a moving one is just hoping it doesnt randomly decide to kill you.
Burning Brakes
Joined: Nov 2022
Posts: 1,059
Likes: 1,118
From: Western Mass
The dangerous and inexcusable defect is what the car does with that information and what it will do to you if any of the four cheap (probably chinese) $40 sensors ever fails to deliver a signal that makes the bullshit modules happy. So if you turn the wheel, Hal just starts jabbing the front brakes so hard it barks the tires, on and off, repeatedly. The car can be fun and could be so good, but anyone inside a moving one is just hoping it doesnt randomly decide to kill you.
Pro
Joined: Jul 2021
Posts: 694
Likes: 617
From: Crosslake, MN
The dangerous and inexcusable defect is what the car does with that information and what it will do to you if any of the four cheap (probably chinese) $40 sensors ever fails to deliver a signal that makes the bullshit modules happy. So if you turn the wheel, Hal just starts jabbing the front brakes so hard it barks the tires, on and off, repeatedly. The car can be fun and could be so good, but anyone inside a moving one is just hoping it doesnt randomly decide to kill you.
Burning Brakes
Joined: Jul 2023
Posts: 854
Likes: 423
From: Ma
I'd actually take this concern seriously. It's not the first time a safety system had unintended consequences. I'd report the issue to GM. Not sure if it's an issue with your car in particular or a built in issue. There's no way a TPS sensor should initiate braking under any circumstances.
Thread Starter
Drifting
Joined: Feb 2005
Posts: 1,330
Likes: 57
lol, no. I have won many championships racing cars, and designed and tested race cars. Not that you need that resume to notice that the car is choosing to repeatedly stab the front brakes (only) so hard it chirps the tires.
Sr.Random input generator
Joined: Jan 2008
Posts: 7,798
Likes: 2,229
From: Sammamish, WA
If you don't have all the sensors, the car thinks you're in dire danger, have at least one flat, and does its best to nullify any move that generates high G (I think limitation was 0.6 G on C6s). I'm sure it feels very weird and unsettling, no doubt on that, but the fix is easy: just use it on all corners, or none.
For note, something similar happens when you also have issues with magnetic shocks. If it loses communication with one of the shocks (which might happen easily when you use simulators), it immediately switches to safety mode, even if you're in the middle of a corner, doing things that scared quite a few owners when it happened. Unlike the case of TPMS, however, removing them all is not a solution as far as I know.
One last time, you can always use the key combination that disables TPMS completely after you start the car. This might be useful if you're only running into this issue during drag runs, track days, etc.
To be honest, I don't blame the car for this behavior at all. They need to make sure the car is safe when TPMS fails, and for those of us using the car for other means, there are already multiple solutions available.
For note, something similar happens when you also have issues with magnetic shocks. If it loses communication with one of the shocks (which might happen easily when you use simulators), it immediately switches to safety mode, even if you're in the middle of a corner, doing things that scared quite a few owners when it happened. Unlike the case of TPMS, however, removing them all is not a solution as far as I know.
One last time, you can always use the key combination that disables TPMS completely after you start the car. This might be useful if you're only running into this issue during drag runs, track days, etc.
To be honest, I don't blame the car for this behavior at all. They need to make sure the car is safe when TPMS fails, and for those of us using the car for other means, there are already multiple solutions available.
Instructor
Joined: Nov 2000
Posts: 226
Likes: 37
From: Orlando, FL
you are correct. when 1 sensor doesn't register the car handling is all out of whack. when I have all 4 sensors removed it took about 5 miles before car registered no sensors and handling ok again.
gor this reason i took out all my sensors as i cant have this issue at track. a guy at track told me, you could get a tpms device ans put in learn mode and car will be fine for 15 min or so while it try to learn.
to test your problem. just put tpms in learn mode and your problem should go away until it learned there is a bad sensor
gor this reason i took out all my sensors as i cant have this issue at track. a guy at track told me, you could get a tpms device ans put in learn mode and car will be fine for 15 min or so while it try to learn.
to test your problem. just put tpms in learn mode and your problem should go away until it learned there is a bad sensor
(1) As far as I know, if you don't have TPMS in any wheel, or if you have it in all wheels, you're OK. If you have it in only some of the wheels, then the car will think you might have a flat/safety issue, and will rein in stability control.
(2) I seem to remember being mentioned here that there is a special combination of buttons you can hit to disable TPMS. If you sarch for it and find it, you can share it here : )
(2) I seem to remember being mentioned here that there is a special combination of buttons you can hit to disable TPMS. If you sarch for it and find it, you can share it here : )
Cruising
Joined: Sep 2015
Posts: 11
Likes: 2
The dangerous and inexcusable defect is what the car does with that information and what it will do to you if any of the four cheap (probably chinese) $40 sensors ever fails to deliver a signal that makes the bullshit modules happy. So if you turn the wheel, Hal just starts jabbing the front brakes so hard it barks the tires, on and off, repeatedly. The car can be fun and could be so good, but anyone inside a moving one is just hoping it doesnt randomly decide to kill you.
Melting Slicks
Joined: Feb 2000
Posts: 3,426
Likes: 568
From: new orleans
Bottom line, you have to have all functioning TPMS or none. If you have 2 installed and 2 not installed, the car will think you have two flats or broken TPMS, and the vehicle will be undrivable. So it's all or none>
Race Director
Joined: Sep 2016
Posts: 13,180
Likes: 10,527
I know that in some cars that won't deal with missing sensors, (even all 4 missing), people have put the sensors in a PVC pipe that's sealed at both ends and has a schraeder valve installed in one end, the pressurize it to the recommended tire pressure and keep it inside the car. That's apparently enough to keep the car happy.
Sr.Random input generator
Joined: Jan 2008
Posts: 7,798
Likes: 2,229
From: Sammamish, WA
I know that in some cars that won't deal with missing sensors, (even all 4 missing), people have put the sensors in a PVC pipe that's sealed at both ends and has a schraeder valve installed in one end, the pressurize it to the recommended tire pressure and keep it inside the car. That's apparently enough to keep the car happy.