False Tire pressure fault warnings - Anybody know the reason?

[Melo1]

I bought a dashcam that caused my sensor faults. Removed it and faults stopped. Returned dashcam and went with another brand.

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[Discount Tire]

Okay, so, got the TPMS sensors replaced in both R wheels and that seems to have fixed the problem. Sensors were replaced for free as they shouldn't have failed within a year of installation. Shout out to @Discount Tire for standing behind what they sell!

Sorry to hear about the trouble with the sensors; glad the store got you taken care of with the replacement!

 

[GW Shark]

Got the car back. They tested everything and could find no issues. So, we'll see if it was a one-off or the issue returns. Glad others are getting some resolution.

 

[Stames]

So this thread is a couple of months old, but I wanted to add my experience with this identical issue that I've been experiencing for 6 months now.

'22 Premium AWD ER; Tire pressure sensor fault began coming on 6 months ago. Typically comes on at roughly 30 minutes into a drive, stays on until the car is turned off, the cycle begins again. It was the right rear pressure sensor, and pressure would drop out completely and just shows dashes for that tire on the tire pressure screen.
Went to the dealer twice for it. First time they just set the pressure. 2nd time they found stored codes so they drove around and monitored the sensor. They couldn't find an issue, but found info or a bulletin about sensor interference, and suggested that we unplug the monitor for the baby cam the next time it happens. They also rotated the tires to see if the faulty sensor moves to the front.
The next day the sensor fault shows up, and it has moved to the front. Since it has moved I assume the sensor is fault, and the baby cam monitor has no relation.
It's been a few weeks now since leaving the dealer, the sensor fault keeps coming on, but I just don't have time to get back in there. This weekend the fault shows up, and I decided to just unplug the baby cam just so I don't have to lie when the service advisor asks. The fault goes away within 5 seconds, and stays off for the rest of the drive. This fault has come on during every 30+ minute drive that I've made over the past 6 months (maybe a hundred times), and always stays on for the duration (even hours sometimes) until the car is shut off.

I still think this sensor has an issue, but if changing to a different backseat cam fixes the issue then I'm satisfied.

TLDR: baby / backseat cams CAN cause tire pressure sensor fault messages.

 

[Mach-Lee]

So this thread is a couple of months old, but I wanted to add my experience with this identical issue that I've been experiencing for 6 months now.

'22 Premium AWD ER; Tire pressure sensor fault began coming on 6 months ago. Typically comes on at roughly 30 minutes into a drive, stays on until the car is turned off, the cycle begins again. It was the right rear pressure sensor, and pressure would drop out completely and just shows dashes for that tire on the tire pressure screen.
Went to the dealer twice for it. First time they just set the pressure. 2nd time they found stored codes so they drove around and monitored the sensor. They couldn't find an issue, but found info or a bulletin about sensor interference, and suggested that we unplug the monitor for the baby cam the next time it happens. They also rotated the tires to see if the faulty sensor moves to the front.
The next day the sensor fault shows up, and it has moved to the front. Since it has moved I assume the sensor is fault, and the baby cam monitor has no relation.
It's been a few weeks now since leaving the dealer, the sensor fault keeps coming on, but I just don't have time to get back in there. This weekend the fault shows up, and I decided to just unplug the baby cam just so I don't have to lie when the service advisor asks. The fault goes away within 5 seconds, and stays off for the rest of the drive. This fault has come on during every 30+ minute drive that I've made over the past 6 months (maybe a hundred times), and always stays on for the duration (even hours sometimes) until the car is shut off.

I still think this sensor has an issue, but if changing to a different backseat cam fixes the issue then I'm satisfied.

TLDR: baby / backseat cams CAN cause tire pressure sensor fault messages.

What type of baby can monitor were you using?

 

[Stames]

It's the "DoHonest" brand from Amazon:

https://a.co/d/6kq1Ufm

I use it in my wife's Q7 as well without an issue, but I think Audi uses/used wheel speed in some way as an indicator of low tire pressure, so I'd need to swap cameras between the two cars to determine if it's a faulty camera or a "trait".

 

[CliffLee]

What type of baby can monitor were you using?

I get the same problem.. always with rear passanger tire. It comes on after approx 20 miles of driving and stays on until I stop and restart car for next drive. I have brought it to the dealer multiple times. They have tried to rotate the tires, replace the tire sensor and it is always the same rear passenger tire. I have since keep the alert messages on the ford app to show the dealer even though there are no codes stored. I was last told when it comes on again to drive right over so they can try and capture the code… go figure

 

[GW Shark]

Sorry your's has been so persistent. It's been 6 months and everything has been fine with mine - no repeat.

 

[ack154]

I guess this explains why my car started showing a TPMS fault this week with the left rear. I just installed my dashcam the other day. Same dashcam I ran in my 4Runner for years without issue. And the same model of dashcam that is installed in my wife's car for years without issue (both are Blackvue DR900S-2CH).

What is it about the Ford TPMS system that doesn't seem to be compatible with some video systems? Is it even worth having this replaced by the dealer as a potentially faulty sensor? Or is it just going to come back right away?

 

[Stames]

Is it even worth having this replaced by the dealer as a potentially faulty sensor? Or is it just going to come back right away?

Is take it to the dealer even if you've confirmed that the baby monitor is causing the issue (by turning it off while driving and watching the fault indicator go away). They could decide to just replace it, although my dealer couldn't duplicate the issue and wouldn't replace the sensor without an active fault.

 

[eddyuan]

Same happened to my 23 select rear left since last week. I have had the dash cam since day 1, no issues for 11 months. Brought in to the dealer and they said they have replaced sensor. Now after 30 mins driving same warning popped on. I’m not sure if it’s the issue with dash cam, but how can a 12v outlet having compatibility issue with TPMS? I don’t understand the logic behind this, any one have a clue of the reason?

 

[HuntingPudel]

Same happened to my 23 select rear left since last week. I have had the dash cam since day 1, no issues for 11 months. Brought in to the dealer and they said they have replaced sensor. Now after 30 mins driving same warning popped on. I’m not sure if it’s the issue with dash cam, but how can a 12v outlet having compatibility issue with TPMS? I don’t understand the logic behind this, any one have a clue of the reason?

TPMS data works over radio frequency. If there is interference, it’s going to fail or have problems. Degraded shielding, degraded connections due to oxidation, poor signal propagation, and a host of other issues can cause increased interference over time. ??

Replacing the sensor only works on one side of the signal to noise ratio equation. If it increases the signal enough (big if there too), it may alleviate the symptom. If the radiated or conducted interference mitigation systems of an add-on has degraded the only real solution is to fix the interference. This is why agency regulations (or directives) require that devices have margin under the limit when new. ??

 

[eddyuan]

TPMS data works over radio frequency. If there is interference, it’s going to fail or have problems. Degraded shielding, degraded connections due to oxidation, poor signal propagation, and a host of other issues can cause increased interference over time. ??

Replacing the sensor only works on one side of the signal to noise ratio equation. If it increases the signal enough (big if there too), it may alleviate the symptom. If the radiated or conducted interference mitigation systems of an add-on has degraded the only real solution is to fix the interference. This is why agency regulations (or directives) require that devices have margin under the limit when new. ??

This explains a lot, thanks

 

[Mach-Lee]

I guess this explains why my car started showing a TPMS fault this week with the left rear. I just installed my dashcam the other day. Same dashcam I ran in my 4Runner for years without issue. And the same model of dashcam that is installed in my wife's car for years without issue (both are Blackvue DR900S-2CH).

What is it about the Ford TPMS system that doesn't seem to be compatible with some video systems? Is it even worth having this replaced by the dealer as a potentially faulty sensor? Or is it just going to come back right away?

FYI poorly designed power conversion electronics produce noise on the radio spectrum. This interference can block the reception of legitimate signals, such as TPMS sensors. It is not the car's fault, it's the electronics you are using. In particular the 12V to USB adapter. You may need to buy a better one that includes FCC certification. Or add ferrite beads onto the power wire.

I bet if you turn on your AM radio to an empty station and plug in your dash cam, you'll hear all kinds of noise. That means it's producing interference.

FYI Ford TPMS is on 315 MHz. If something is making noise that high in the spectrum it's a really crappy RF design.

 

[ack154]

FYI poorly designed power conversion electronics produce noise on the radio spectrum. This interference can block the reception of legitimate signals, such as TPMS sensors. It is not the car's fault, it's the electronics you are using. In particular the 12V to USB adapter. You may need to buy a better one that includes FCC certification. Or add ferrite beads onto the power wire.

I bet if you turn on your AM radio to an empty station and plug in your dash cam, you'll hear all kinds of noise. That means it's producing interference.

FYI Ford TPMS is on 315 MHz. If something is making noise that high in the spectrum it's a really crappy RF design.

Not using 12V adapter though - it's hard wired. And actually, it's a battery that's hard wired and the camera is connected to the battery.

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