TPMS error. Sensor or receiver?

[Fuel Fire Desire]

Looking for thoughts on this. A few days before I rotated my tires, both rear TPMS sensors would read dashes for about 30 seconds after start, generating a TPMS error message that would clear on its own. Immediately after I rotated (SP - DR - PF - DF - PR - SP) the PR sensor read dashes and never returned. That tire was on the DF.

sensors are original on my2018.

I’m hoping it’s just a sensor battery that died, but find it odd the rears were having an issue reading before the rotation, and now that one is totally gone. DR is still fine. Probable sensor failure? Or a receiver issue?

New wheels and tires will be inbound soon with new sensors, so I’m not concerned about a sensor failing, but was curious if it could be a receiver issue, and if there’s any way I can diagnose it myself.

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[Goin2drt]

Chances are no way a receiver is bad. Chances are most likely the TPMS is not bad if they are the OEM TPMS from new.

Chances are high that after the rotation the Spare is messing up the relearn. Take the spare off. Make sure your tires are set to door placard PSI (36lbs) and then go drive a couple of blocks. Once they relearn then install the spare back on.

Hope that helps.

 

[Fuel Fire Desire]

Chances are no way a receiver is bad. Chances are most likely the TPMS is not bad if they are the OEM TPMS from new.

Chances are high that after the rotation the Spare is messing up the relearn. Take the spare off. Make sure your tires are set to door placard PSI (36lbs) and then go drive a couple of blocks. Once they relearn then install the spare back on.

Hope that helps.

I’d buy that, except the spare didn’t wind up in that position. The spare is on the opposite side. The wheel in question is the next to become a spare, which means it has the highest mileage on the set, it probably has 15-20k miles on it since it was last a spare. It had been working fine in all other positions since then.

 

[Goin2drt]

Yeah but wasn’t one of your tires on the ground now a spare?

 

[Valpo Jeep]

Tire sensor batteries tend to last about 8 years or so. I have not had 1 go dead before about that much time but anything is possible. I have never had to replace 2 at the same time though. I really doubt that it’s 2 bad sensors but rather something else. You can get a sensor reader / learner for under $20 off Amazon. Tempted myself to get 1 but then at the same time I can just take it to the tire shop and have it read out for free

 

[Fuel Fire Desire]

Yeah but wasn’t one of your tires on the ground now a spare?

Ohhhh, I see what you’re getting at now. You’re correct. That problem position was where the spare was sitting. Good thinking, I’ll try that out.

EDIT: I just gave your suggestion a try. Removed the spare, drove it for a few miles, full shutdown/ restart, a couple more miles, but still dashes. The other tires updated their pressure, so there was communication happening, just not on the PR.

 

[Fuel Fire Desire]

Well, I think we found the problem. I deflated the PR problem tire to 25 and took it for a drive. Immediately after start up the DF was showing 25, which was where the bad sensor was last, still dashed on the PR. So the issue isn’t the sensors, it’s the system failing to update new wheel position after rotation. The PR is showing dashes because it thinks the now spare is still there and it’s not, so of course it isn’t transmitting a signal.

The system has always self updated positions after rotations up until now. Any idea on how to force the system to update?

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