3 year Tpms issues
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
3 year Tpms issues
Bought my car 2019 with 2100 miles put new wheels and tires on shortly after with OEM Tpms sensors. After about a year I would periodically lose the front right sensor only on the highway at constant speed. Cycle key drive a bit and it comes back. Main Battery is new. Tpms sensor battery shows good. Then recently the left front would vanish but right front was there. Now all 4 are just showing dashes. I tried the sensor relearn procedure with no luck so I purchased relearn tool after watching a video with stubborn sensors working. I put it into relearn mode where the turn signal comes on but it won't pick up the sensor with the tool. I'm getting history codes c0750, c0755, c0760 and c0765 for all 4 sensors. Also getting a U0422. I was reading there is a module that has to do with the key that the sensors are tied into is this true. Where is it located? TIA
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
What is the year of the car? Even if you bought a 2019 in 2019, the sensors are 5 years old, assuming they were within a couple months of the car built. Is it possible that the old sensors are dead?
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
they were brand new in 2019. the Tpms in my Honda are 13 years old so I find it hard to believe that they would be dead already. When I had them checked the batteries were all good last year. Im gonna be checking them again to make sure but I find it hard to believe they ALL died within 3 months
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
they were brand new in 2019.
the Tpms in my Honda are 13 years old so I find it hard to believe that they would be dead already. When I had them checked the batteries were all good last year. Im gonna be checking them again to make sure but I find it hard to believe they ALL died within 3 months
the Tpms in my Honda are 13 years old so I find it hard to believe that they would be dead already. When I had them checked the batteries were all good last year. Im gonna be checking them again to make sure but I find it hard to believe they ALL died within 3 months
https://www.redi-sensor.com/faqs/und...pms-batteries/
If they were all from the same batch, dying within a few months of each other wouldn't surprise me.
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
You know this how? Are you sure it wasn't sitting on the shelf for a while? IOW, could it be NOS?
https://www.redi-sensor.com/faqs/und...pms-batteries/
If they were all from the same batch, dying within a few months of each other wouldn't surprise me.
https://www.redi-sensor.com/faqs/und...pms-batteries/
If they were all from the same batch, dying within a few months of each other wouldn't surprise me.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
well when you buy from a high volume dealer that sells sub par parts as a company you'd figure the inventory turn over would have them as "new". The car has only been driven 8k miles since they were installed and the batteries don't drain sitting still. So even if they were NOS it "shouldn't" matter
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
Update: bought and installed 4 new sensors. They would NOT auto learn even using the Tpms learn function. Stopped at a mom and pop shop and their Tpms scanner wouldn't read the sensors at all. Went to discount randomly on the way home. His scanner would read 3 of 4. After a few trips around the car he got all 4 to read and forced the car to "see" them. I thought everything was good to go. Apparently not on the highway the front two sensors dropped out showing --. The left front came back on after a minute or so but the front right wouldn't come back at all.
Drifting
Joined: Feb 2005
Posts: 1,456
Likes: 173
From: San Jose Ca
Thats really odd. The c7 sensors don't need relearning. Are you sure you got the correct sensors for the car? I know you said you got new sensors again, but it is possible you got new old stock which could have failing batteries in them. I've gotten new sensors with dead batteries. BTW, it is possible to put new batteries in the sensors. I've done it for C5 and C6 sensors, and I have done some preliminary work on a set of c7 sensors. The batteries are readily available, and it just takes a bit of determination and some soldering skills to remove and add the new batteries.
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Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
Thats really odd. The c7 sensors don't need relearning. Are you sure you got the correct sensors for the car? I know you said you got new sensors again, but it is possible you got new old stock which could have failing batteries in them. I've gotten new sensors with dead batteries. BTW, it is possible to put new batteries in the sensors. I've done it for C5 and C6 sensors, and I have done some preliminary work on a set of c7 sensors. The batteries are readily available, and it just takes a bit of determination and some soldering skills to remove and add the new batteries.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
Can I ask if you got it working for several years and why you went to this as a solution instead of getting 4 new ones? Either way you would have to dismount and remount the tires and then balance it. Is the original sensor better in some ways or what?
Drifting
Joined: Feb 2005
Posts: 1,456
Likes: 173
From: San Jose Ca
I've gotten a spare set of sensors from another c7 forum member that just charged me shipping and gave me his old sensors for me to experiment on. I'm in the process of replacing those batteries now. I have the old battery removed, just need to solder the new ones in and pot it and its ready to go. I think the four batteries cost 15 bucks or so.
Thread Starter
Racer
Joined: Dec 2019
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Likes: 37
I did it for a number of reasons. First one is I hate throwing stuff away that is still useable but just needs a battery. As I said earlier, I've been successful with c5 and c6 sensors already. I don't have a feel for how long they lasted as I've sold off those cars. The batteries are cheap and readily available on ebay. Because I know its original and worked in the past, I know that its the correct sensor for the car. They tend to die one at a time, so if I have a spare ready to go, all I need to do is break the outer bead, which I can do at home since I have a tire machine in my garage, and swap out the sensor. So no balancing required. Lastly, I like doing stuff like this for the challenge. If it doesn't work, I'm only out a few bucks.
I've gotten a spare set of sensors from another c7 forum member that just charged me shipping and gave me his old sensors for me to experiment on. I'm in the process of replacing those batteries now. I have the old battery removed, just need to solder the new ones in and pot it and its ready to go. I think the four batteries cost 15 bucks or so.
I've gotten a spare set of sensors from another c7 forum member that just charged me shipping and gave me his old sensors for me to experiment on. I'm in the process of replacing those batteries now. I have the old battery removed, just need to solder the new ones in and pot it and its ready to go. I think the four batteries cost 15 bucks or so.
Drifting
Joined: Feb 2005
Posts: 1,456
Likes: 173
From: San Jose Ca
I'd have to go back and check, its been a while since I worked on them. I'll check it out when I get home today and refresh my memory. I want to say I just carefully pried it away from the sensor body.
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
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Update: changed all 4 previously. Right front dropped out and would not come back so I pulled the wheels off to have that replaced again. Got the car to see the sensors drive about 30 miles and the left front dropped out. So I again changed the left front for a total of 6 sensors. Now after driving it again the right front dropped out but came back a few miles later then dropped out again. ZERO aftermarket electronics car battery was removed and tested charged for 24hrs and tested to be fine again
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
Well im back again with more issues. I got 4 sensors to work after trying 11 different ones. Worked great till I need new tires. Installed the same sensors with new tires and new wheels. All 4 were showing on the first drive but the front left was showing 2psi about 10 mins later it was read 32 like the rest. Another 30-40 miles down the road the front left showed -- by the time I got home all of the are --. When I went to a tire shop they couldn't get a signal off the right sensors front and rear (yes the front left dropped first but the picked it up immediately) so I came home and tried to force them again. Neither right side would read so I deflated both of them and refilled to 32 front right still won't read but but the back right was working again. It's become exhausting dealing with this stupid system.
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
I don't think the system is the problem. I think it is the sensor. Maybe the sensor itself has reached the end of it's life and is designed to work a little past expected battery life? Just a thought. I get that we were brought up with parents that took pride in how long their things last. Maybe your parents were like mine and refused to give up their refrigerator and spent a couple hours every Sunday morning defrosting in high humidity environments it even when self defrosting was available and it wasn't because they couldn't afford it. Me, OTOH, I'm a gadget ***** and will upgrade to new stuff. I tossed my good sensors when I changed tires because I didn't want this exact mess you are going through. That puts DT on the hook to make sure it works. Just a suggestion, maybe get a shop to do it for you and make it their responsibility if it fails?
Thread Starter
Racer
Joined: Dec 2019
Posts: 361
Likes: 37
I don't think the system is the problem. I think it is the sensor. Maybe the sensor itself has reached the end of it's life and is designed to work a little past expected battery life? Just a thought. I get that we were brought up with parents that took pride in how long their things last. Maybe your parents were like mine and refused to give up their refrigerator and spent a couple hours every Sunday morning defrosting in high humidity environments it even when self defrosting was available and it wasn't because they couldn't afford it. Me, OTOH, I'm a gadget ***** and will upgrade to new stuff. I tossed my good sensors when I changed tires because I didn't want this exact mess you are going through. That puts DT on the hook to make sure it works. Just a suggestion, maybe get a shop to do it for you and make it their responsibility if it fails?
Team Owner
Joined: Jul 2004
Posts: 28,472
Likes: 3,290
From: Hartford WI
It sucks but we just started driving so I would not want to spend the summer seeing that message. Now if you bought an Audi, you won't have that problem. TPMS is managed by the ECM not using TPMS Sensors.
