TPMS issue
Thread Starter
Intermediate
Joined: Dec 2023
Posts: 44
Likes: 45
From: Oklahoma
2023 Restomod of the Year finalist
TPMS issue
After about 40 minutes of driving (miles don't seem to matter), TPMS will show "XX" and associated idiot light/ message, but it doesn't go into limp mode or seem to affect handling.
What is interesting is that it is never just one tire. It will be the fronts then next time it might be the rears. Sometimes it is both LH or both RH that fail. Other times, all four fail - but never just one.
I had new tires and rims put on 12 months ago by a reputable Corvette shop (I have no idea who they outsourced tire mounting to, though). I dont think they would have reused old TMPS batteries (but they could). It's just weird that it's not just one.
I just have one set of tires (don't race it), and it's never just one tire, so I think this is different than most of the other TPMS posts.
Thanks in advance
What is interesting is that it is never just one tire. It will be the fronts then next time it might be the rears. Sometimes it is both LH or both RH that fail. Other times, all four fail - but never just one.
I had new tires and rims put on 12 months ago by a reputable Corvette shop (I have no idea who they outsourced tire mounting to, though). I dont think they would have reused old TMPS batteries (but they could). It's just weird that it's not just one.
I just have one set of tires (don't race it), and it's never just one tire, so I think this is different than most of the other TPMS posts.
Thanks in advance
Racer
Joined: Oct 2020
Posts: 414
Likes: 245
From: Seattle, WA
The XX message is typically when the sensor battery is low and losing communication with the DIC. If your invoice for the new tires doesn't show a charge for new TPMS sensors then I'd suspect they left them in and they now need replacing. With the XX active, any hard & aggressive driving above 55 mph will activate the active handling system. I learned this during a track day when my sensors decided to go XX on me.
Melting Slicks
Joined: Oct 2022
Posts: 3,301
Likes: 1,892
From: Ulta Vista, AZ
Mine does it with my rear left tire sometimes. I have my doubts on it being a battery because mine only does it occasionally and it’s been a few years now doing it.
i am replacing all the sensors next time the tires come off
i am replacing all the sensors next time the tires come off
Team Owner
Joined: May 2000
Posts: 53,567
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From: Plantation Florida USAF(Retired) 1966-1990
U.S. Air Force
St. Jude Donor '05 thru '26
NCM Sinkhole Donor
I found out when they register XXX they need replacing, the battery doesn't last forever.
I advice you replace all 4 of them, cause one goes other will follow soon I learned the hard way.
I advice you replace all 4 of them, cause one goes other will follow soon I learned the hard way.
Race Director
Joined: Dec 2013
Posts: 12,501
Likes: 3,627
Could be tpms battiers starting to go weak, or could be after market items like LED bulbs in the car, making enough RF noises, that it blocking the TPMS signals to the RCDLR in the first place.
So if not sure that TPMS's where changed with tires, then do such now with the correct Schrader tpms for your car year, and if your still having problem, then time to start checking the car for RF noise from after market device, and may want to dive in to the RCDLR to check is connector for corrosion problems at the connectors, or cold solder joints on the board.
So if not sure that TPMS's where changed with tires, then do such now with the correct Schrader tpms for your car year, and if your still having problem, then time to start checking the car for RF noise from after market device, and may want to dive in to the RCDLR to check is connector for corrosion problems at the connectors, or cold solder joints on the board.
Race Director
Joined: Jul 2005
Posts: 12,018
Likes: 3,555
From: Central MO
You would know if the TPMS sensors were replaced, as there would be at a minimum a $125 charge for them.
XX does affect active handling even at lower speeds when you are cornering hard. Mine has kicked in at 30 mph when I was pushing hard through a roundbout in the GS.
XX does affect active handling even at lower speeds when you are cornering hard. Mine has kicked in at 30 mph when I was pushing hard through a roundbout in the GS.
Instructor
Joined: Feb 2024
Posts: 236
Likes: 96
If the message is not always the same tire it could definitely be interference. If I am using my FM radio transmitter it sets off a TPMS error about 50% of the time. My TPMS sensors probably have low batteries too though, so it is not helping. Usually they are fine with no FM radio transmitter in use.
Drifting
Joined: Mar 2010
Posts: 1,901
Likes: 361
From: TX
If the message is not always the same tire it could definitely be interference. If I am using my FM radio transmitter it sets off a TPMS error about 50% of the time. My TPMS sensors probably have low batteries too though, so it is not helping. Usually they are fine with no FM radio transmitter in use.
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Melting Slicks
Joined: Oct 2022
Posts: 3,301
Likes: 1,892
From: Ulta Vista, AZ
Thenonly thing I couldn’t do was turn off traction control or put into comp mode with it on.
Ibhave read several other people making claims that they almost crashed their car because of it though which makes me wonder if comp mode was turning off or traction control turning on as soon as it popped up. Otherwise I can’t see how this would cause what is being reported and has never happened to me in the 3+ yrs of me driving my car with this error
Race Director
Joined: Jul 2005
Posts: 12,018
Likes: 3,555
From: Central MO
that being said, I have absolutely went full race mode with my one tire reading xx with no issues.
Thenonly thing I couldn’t do was turn off traction control or put into comp mode with it on.
Ibhave read several other people making claims that they almost crashed their car because of it though which makes me wonder if comp mode was turning off or traction control turning on as soon as it popped up. Otherwise I can’t see how this would cause what is being reported and has never happened to me in the 3+ yrs of me driving my car with this error
Thenonly thing I couldn’t do was turn off traction control or put into comp mode with it on.
Ibhave read several other people making claims that they almost crashed their car because of it though which makes me wonder if comp mode was turning off or traction control turning on as soon as it popped up. Otherwise I can’t see how this would cause what is being reported and has never happened to me in the 3+ yrs of me driving my car with this error
Burning Brakes
Joined: Feb 2021
Posts: 771
Likes: 399
2022 C6 of the Year Finalist - Unmodified
My rear one did this and I replaced all 4....
Car goes into a "Nannie" mode when it does this. Try to take a curve over 55 and the car goes into a crazy Anti Skid mode and damn near wrecks you...... Happened to me.... I also read that straight line over 120, it will do the same thing. Computer thinks you are running on run flats with no air and keeps you "safe" from incident.
Car goes into a "Nannie" mode when it does this. Try to take a curve over 55 and the car goes into a crazy Anti Skid mode and damn near wrecks you...... Happened to me.... I also read that straight line over 120, it will do the same thing. Computer thinks you are running on run flats with no air and keeps you "safe" from incident.
Thread Starter
Intermediate
Joined: Dec 2023
Posts: 44
Likes: 45
From: Oklahoma
2023 Restomod of the Year finalist
Interference could certainly be it - Ill try keeping the gizmos at home on the next ride as I have always had a phone in the car when it fails. It happened before the aftermarket stereo was installed so Ill pull the breakers on that as well.
80% of the time, the failure happens with pairs of wheels. 19.5% of the time its all four wheels at the same time. I couldn't tell say when the last single wheel XX I had was (but it was before new wheels and tires).
Standby for more...
PS I dont run it hard so it has not been a result of (or affected) handling of the car.
80% of the time, the failure happens with pairs of wheels. 19.5% of the time its all four wheels at the same time. I couldn't tell say when the last single wheel XX I had was (but it was before new wheels and tires).
Standby for more...
PS I dont run it hard so it has not been a result of (or affected) handling of the car.
Drifting
Joined: Mar 2010
Posts: 1,901
Likes: 361
From: TX
If it continues even without your cell phone in the car, it may simply be a sign of the batteries in the sensors getting low. Both cold and hot weather can aggravate lithium ion battery performance and when the batteries get older they become more susceptible to temperature swings.
Safety Car
Joined: Feb 2016
Posts: 4,398
Likes: 1,373
From: SC
The batteries are not replaceable, the entire TPMS device on each wheel has to be replaced so it would be on the invoice if they did it. They tend to last quite awhile. You don't say what year your Vette is but they're all old enough to be due for replacement. I've got a '13 with the original TPMS but when baby gets new shoes in the spring she will get new TPMS.
THe only time I've had the XX readings was when my brother put his phone in the cup holder. But I have all original head unit and bulbs. The system seems to be very sensitive to RFI.
THe only time I've had the XX readings was when my brother put his phone in the cup holder. But I have all original head unit and bulbs. The system seems to be very sensitive to RFI.
Thread Starter
Intermediate
Joined: Dec 2023
Posts: 44
Likes: 45
From: Oklahoma
2023 Restomod of the Year finalist
On what I thought was an unrelated issue, on rare occasions, the car wont turn over when you press the start button - it just goes dark. Clicking lock, unlock, opening and closing the drivers door seems to fix it. The TPM uses the Remote Control Door Lock Receiver (RCDLR) box. Does anyone know if the same physical antennas are used for TMP and FOB detection?
Still working the interference angle though.
Still working the interference angle though.
Last edited by RedShft; Jan 19, 2025 at 01:26 PM.