2008 TPMS problems, help please
Thread Starter
Instructor
Joined: Dec 2008
Posts: 218
Likes: 4
2008 TPMS problems, help please
I just picked up a 2008 Vert (my 3rd 2008, guess I should stop selling them!). I got a good deal partially because the TPMS service warning is on and the light is solid on.
Only the LF tire displays "XX" and the other three display nothing.
I've read numerous threads and attempted reprogramming using a VXDAS EL-50448 tool I bought cheap on Amazon. The car goes into learn mode but there is no response to programming.
I've read that "XX" means the module isn't seeing the sensors. What does it mean when there is no display at all, no pressure and no "XX"?
Suggested troubleshooting from here? I have no idea if the cheap tool is working so I was thinking I'd try a tire place and see if a better tool does anything.
Only the LF tire displays "XX" and the other three display nothing.
I've read numerous threads and attempted reprogramming using a VXDAS EL-50448 tool I bought cheap on Amazon. The car goes into learn mode but there is no response to programming.
I've read that "XX" means the module isn't seeing the sensors. What does it mean when there is no display at all, no pressure and no "XX"?
Suggested troubleshooting from here? I have no idea if the cheap tool is working so I was thinking I'd try a tire place and see if a better tool does anything.
Instructor
Joined: Mar 2017
Posts: 226
Likes: 45
From: Lake Mathews Ca
I just picked up a 2008 Vert (my 3rd 2008, guess I should stop selling them!). I got a good deal partially because the TPMS service warning is on and the light is solid on.
Only the LF tire displays "XX" and the other three display nothing.
I've read numerous threads and attempted reprogramming using a VXDAS EL-50448 tool I bought cheap on Amazon. The car goes into learn mode but there is no response to programming.
I've read that "XX" means the module isn't seeing the sensors. What does it mean when there is no display at all, no pressure and no "XX"?
Suggested troubleshooting from here? I have no idea if the cheap tool is working so I was thinking I'd try a tire place and see if a better tool does anything.
Only the LF tire displays "XX" and the other three display nothing.
I've read numerous threads and attempted reprogramming using a VXDAS EL-50448 tool I bought cheap on Amazon. The car goes into learn mode but there is no response to programming.
I've read that "XX" means the module isn't seeing the sensors. What does it mean when there is no display at all, no pressure and no "XX"?
Suggested troubleshooting from here? I have no idea if the cheap tool is working so I was thinking I'd try a tire place and see if a better tool does anything.
I ended up with the tool when trying to troubleshoot my XX problem.
I narrowed it down to the receiver, bought one, and in the process of removing the radio to get to it I found a blue tooth adapter the previous owner had installed the was causing the issue. Removed it and no more problems.
Race Director
Joined: Apr 2007
Posts: 14,062
Likes: 602
From: Henderson Nv-Rohnert Park/Sonoma C o. ca/born in NY Rockaway Beach.
Sounds like the battery is gone in the sensor and needs to be replace.
I have the same type of learning tool and it works fine.
The car is 10 years old. Could be the sensors are the same age and could all need to be replace.
Just a thought.
I have the same type of learning tool and it works fine.
The car is 10 years old. Could be the sensors are the same age and could all need to be replace.
Just a thought.
I just picked up a 2008 Vert (my 3rd 2008, guess I should stop selling them!). I got a good deal partially because the TPMS service warning is on and the light is solid on.
Only the LF tire displays "XX" and the other three display nothing.
I've read numerous threads and attempted reprogramming using a VXDAS EL-50448 tool I bought cheap on Amazon. The car goes into learn mode but there is no response to programming.
I've read that "XX" means the module isn't seeing the sensors. What does it mean when there is no display at all, no pressure and no "XX"?
Suggested troubleshooting from here? I have no idea if the cheap tool is working so I was thinking I'd try a tire place and see if a better tool does anything.
Only the LF tire displays "XX" and the other three display nothing.
I've read numerous threads and attempted reprogramming using a VXDAS EL-50448 tool I bought cheap on Amazon. The car goes into learn mode but there is no response to programming.
I've read that "XX" means the module isn't seeing the sensors. What does it mean when there is no display at all, no pressure and no "XX"?
Suggested troubleshooting from here? I have no idea if the cheap tool is working so I was thinking I'd try a tire place and see if a better tool does anything.
Advanced
Joined: Feb 2014
Posts: 64
Likes: 8
I have a 2006 vert. Was traveling for a couple of weeks. When I got home the Vette battery went flat from sitting in the garage. After an overnight charge at 2A, the car fired right up but the “Service Tire Monitor” warning comes on at startup in the DIC. I get “XX” on 3 of the tires, and nothing in the RT Rear indicator.
Is there a “reboot” process for the TPMS system?
Thanks!!
Is there a “reboot” process for the TPMS system?
Thanks!!
Instructor
Joined: Mar 2017
Posts: 226
Likes: 45
From: Lake Mathews Ca
I have a 2006 vert. Was traveling for a couple of weeks. When I got home the Vette battery went flat from sitting in the garage. After an overnight charge at 2A, the car fired right up but the “Service Tire Monitor” warning comes on at startup in the DIC. I get “XX” on 3 of the tires, and nothing in the RT Rear indicator.
Is there a “reboot” process for the TPMS system?
Thanks!!
Is there a “reboot” process for the TPMS system?
Thanks!!
Try driving it.
Advanced
Joined: Feb 2014
Posts: 64
Likes: 8
I guess I left out that critical piece of info. I’ve driven it about 200 miles since the battery charge. I also had to re-index the windows so the power top would work. Discovered that issue after a previous battery fade out.
Race Director
Joined: Apr 2007
Posts: 14,062
Likes: 602
From: Henderson Nv-Rohnert Park/Sonoma C o. ca/born in NY Rockaway Beach.
Same for my 2010 GS. I got it in Jan 2016 and the day after I picked the car up sight unseen. Had a friend check it out for me. But one sensor went out on me. Replace it. Then on the way back to Cali another one ent. Lol. So needless to say I changed them later that year when I swapped wheels.
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Advanced
Joined: Feb 2014
Posts: 64
Likes: 8
I’ve only had the car since January and it has 81K miles. Before the battery faded, the TPMS worked reliably, but I’d get a RT Rear tire flat warning occasionally. Probably take it to the tire shop this weekend and have them put the diagnostic tool on it. The tire sensors are probably original....
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,628
TPMS's are stand alone units in the tire, so all that is needed is just a TPMS tool that can trigger the senor to get a reading from each TPMS one at a time isntead.
Attachment 48333004
If the reading comes back at either will not trigger, or the battery is weak, then the the TPMS is replaced in the tire, and relearned to the cars RCDLR.
Myself, would pick up a set of OEM tpms's (gm #25758220) since their batteries last about the longest , then have all 4 TPMS replaced in the tires as a set. Hence if one of the sensors batteries is dying, then figure that the rest of the sensor batteries will be dying shortly afterwards.
Hence if the problem is a RCDLR problem with the TPMS just needing to be relearned to the car due to a gltich in the RCDLR, you get the 00 read out in the DIC.
Note, if you disconnect the battery, and have not driving the car for a few miles so the RCDLR can pull another reading from the TPMS's, will get the 00 reading in the DIC as well.
When the TPMS battery dies, then you get the XX reading in the DIC instead.
Attachment 48333004
If the reading comes back at either will not trigger, or the battery is weak, then the the TPMS is replaced in the tire, and relearned to the cars RCDLR.
Myself, would pick up a set of OEM tpms's (gm #25758220) since their batteries last about the longest , then have all 4 TPMS replaced in the tires as a set. Hence if one of the sensors batteries is dying, then figure that the rest of the sensor batteries will be dying shortly afterwards.
Hence if the problem is a RCDLR problem with the TPMS just needing to be relearned to the car due to a gltich in the RCDLR, you get the 00 read out in the DIC.
Note, if you disconnect the battery, and have not driving the car for a few miles so the RCDLR can pull another reading from the TPMS's, will get the 00 reading in the DIC as well.
When the TPMS battery dies, then you get the XX reading in the DIC instead.
Melting Slicks
Joined: Apr 2018
Posts: 3,185
Likes: 779
I didn’t have XX on pressure but a few weeks ago I had my left rear tire constantly reading 50psi, just the left. It did not have 50psi. Tried to reset by disconnecting the battery but it still read 50psi. Never did get it to a place with the reset tool. I can’t prove this for 100% but when I started seeing the false reading in that tire I had just put in a different blue tooth adapter, the plug in kind. It was cheap and only lasted a few weeks. Went of few days without one(cars not daily driver) bought a new Bluetooth and over the next few days the left rear started to fix it self. First I noticed it say 47psi which I had not seen anything beside 50psi before. It slowly started getting closer the the actual read each time I drove it. After 4 or 5 times go out in it with the new Bluetooth it now reads the correct PSI. Kinda weird not sure if it’s related but the only thing I changed was the Bluetooth plug in adapter and now it works.
Race Director
Joined: Oct 2005
Posts: 14,555
Likes: 1,255
From: Saint Albans, WV
If your relearn process works until you get to the troubled tpm it needs to be replaced and while it may be a little more expensive to get a factory tpm you’re better off instead of taking a chance on getting one cheaper on the web that won’t match.
Race Director
Joined: Dec 2013
Posts: 12,502
Likes: 3,628
I didn’t have XX on pressure but a few weeks ago I had my left rear tire constantly reading 50psi, just the left. It did not have 50psi. Tried to reset by disconnecting the battery but it still read 50psi. Never did get it to a place with the reset tool. I can’t prove this for 100% but when I started seeing the false reading in that tire I had just put in a different blue tooth adapter, the plug in kind. It was cheap and only lasted a few weeks. Went of few days without one(cars not daily driver) bought a new Bluetooth and over the next few days the left rear started to fix it self. First I noticed it say 47psi which I had not seen anything beside 50psi before. It slowly started getting closer the the actual read each time I drove it. After 4 or 5 times go out in it with the new Bluetooth it now reads the correct PSI. Kinda weird not sure if it’s related but the only thing I changed was the Bluetooth plug in adapter and now it works.
Here is where it nice to have something like the Cub 101, since you can do a quick scan of just the TPMS in question, and see what is actual sending out as pressure once triggered.
Hence if you get 50lbs back on the TPMS itself, have only 32lbs of air in the tire, then you know the problem is the TPMS itself. To take it one step farther, with it reading 50lbs, bank that someone use tire slim in the tire for a flat, the slim dried in the TPMS tire passage, and what killed the TPMS sensor.
If you get a reading back of only 32lbs on the scan tool from the TPMS sensor when the tool triggers the TPMS, then you know that the sensor if fine, and it's a problem between the sensor and the RCDLR instead. On something like this, short battery disconnect to reset the RCDLR in the first place, put the car into TPMS relearn mode, and relearn the TPMS sensors to the car to see if that solves the problem.
If you still have problems, then start checking add on devices that are creating enough RF noise, that is drowning out the TPMS single from reaching the RCDLR correctly isntead.
Thread Starter
Instructor
Joined: Dec 2008
Posts: 218
Likes: 4
That Cub tool would be great to have but it looks like anything like that is $150+ now. My DIC reads nothing on 3 of the wheels and XX on one wheel. I talked to the previous owner and he said he never replaced the TPMS sensors so they probably are dead. I'll probably order new sensors as even if that isn't the whole problem, they are 10+ years old. We'll see if that fixes it or if there's more to the issue. Thanks for the responses 
TPMS's are stand alone units in the tire, so all that is needed is just a TPMS tool that can trigger the senor to get a reading from each TPMS one at a time isntead.
If the reading comes back at either will not trigger, or the battery is weak, then the the TPMS is replaced in the tire, and relearned to the cars RCDLR.
Myself, would pick up a set of OEM tpms's (gm #25758220) since their batteries last about the longest , then have all 4 TPMS replaced in the tires as a set. Hence if one of the sensors batteries is dying, then figure that the rest of the sensor batteries will be dying shortly afterwards.
Hence if the problem is a RCDLR problem with the TPMS just needing to be relearned to the car due to a gltich in the RCDLR, you get the 00 read out in the DIC.
Note, if you disconnect the battery, and have not driving the car for a few miles so the RCDLR can pull another reading from the TPMS's, will get the 00 reading in the DIC as well.
When the TPMS battery dies, then you get the XX reading in the DIC instead.
If the reading comes back at either will not trigger, or the battery is weak, then the the TPMS is replaced in the tire, and relearned to the cars RCDLR.
Myself, would pick up a set of OEM tpms's (gm #25758220) since their batteries last about the longest , then have all 4 TPMS replaced in the tires as a set. Hence if one of the sensors batteries is dying, then figure that the rest of the sensor batteries will be dying shortly afterwards.
Hence if the problem is a RCDLR problem with the TPMS just needing to be relearned to the car due to a gltich in the RCDLR, you get the 00 read out in the DIC.
Note, if you disconnect the battery, and have not driving the car for a few miles so the RCDLR can pull another reading from the TPMS's, will get the 00 reading in the DIC as well.
When the TPMS battery dies, then you get the XX reading in the DIC instead.
Drifting
Joined: Feb 2005
Posts: 1,441
Likes: 173
From: San Jose Ca
I got a cub 101 a few years ago when tire rack was blowing them out for something like 25 bucks.
The sensors are rebuildable if you know how to remove epoxy and have soldering skills/capability. I rebuild mine and have one or two spares sitting on the shelf so that when I change tires (usually only front or rear pair at a time) I can swap out the sensor if its dead.
The sensors are rebuildable if you know how to remove epoxy and have soldering skills/capability. I rebuild mine and have one or two spares sitting on the shelf so that when I change tires (usually only front or rear pair at a time) I can swap out the sensor if its dead.