'Too long, didn't read' version:
My Rock Auto TPMS valve stem assemblies don't communicate correct info from the spare tire position, no matter which wheel/tire assembly is mounted there.
Convoluted version, about how repair facilities don't have my confidence:
I had a TPMS dash light come on some time late last summer.
Finally bought TPMS valve stem assemblys from Rock Auto this spring.
Finally had them installed some time around June by a local Northern Virginia area tire store/auto repair chain.
Replaced all 5 valve stems, did 5 wheel tire rotation/balance, and some other stuff while I was there.
When I pick it up - TPMS light on dash is still on, and the overhead console (the one that tells me there's an issue but not individual tire pressures) informs me that the spare tire is low.
We check pressure, it's fine, they check and verify that the 5 valve stems are broadcasting the correct pressure at the correct frequency.
They tell me to drive it for 10-15 miles, it'll be fine.
2 Days, a dozen restarts, and 200 miles later, the light is still on, and the spare tire low message still pops up every restart.
So I take it back, and leave it for them to sort out.
We agree that they swap the mounted wheel/tire units to different corners, and try again.
We do this several times over several days, and the message always tells me that the spare tire pressure is low.
They tell me they have another (newer) location that has a (newer) computer scanner (with newer/more recent software) that will sort it out, so we make the arrangements for that to happen.
The newer location has the same issues, and doesn't know what to do, as the valve stems are still broadcasting OK, so it's just chalked up to be 'a real puzzler'.
I'm in the middle of moving from one end of the state to the other, so it's put on the back burner, again.
Fast forward to a few weeks ago, my ABS/BAS/TCS lights start coming on at random after a hard thunderstorm.
This is accompanied by the ABS randomly locking up random wheels/brakes.
This occurs within a minute of starting, and continues until the vehicle is shut off.
I do a search on ABS issues here, and find several threads - I do diagnostics at home for bad rear wiring from the connector under the rear seat to the ABS sensors at the rear axle.
I discover that the thunderstorm/heavy rain has overwhelmed the sunroof drains, and while my carpet doesn't show 'wet', I could be raising catfish in the water trapped under it.
I gut the interior to dry it out for days, and the ABS problem stays random but constant every few minutes.
But the wires and connections all show good continuity.
So I make an appointment at the local Jeep dealer to diagnose the ABS/BAS/TCS issue, and figure out what the problem is with the TPMS.
It takes them $95 diagnostics and over an hour to come back and tell me that they think my ABS system has a problem, and they think it's one of the two rear sensors.
Which aren't in stock, but they'll have them some time in the next 2 days.
**And they inform me that TPMS valve assemblies from places like Rock Auto, and specifically NOT FROM JEEP SPECIFIC dealers, almost always show failure such as my 'Spare Low Pressure' issue because they wont communicate with the SKIM, and all they can do is replace all 5 valve assemblies with authorized Jeep parts.**
I order both rear ABS sensors from NAPA, and replace them the next morning, the brakes work great again.
I lack the ability to believe that the average tire store facility or Jeep dealer can figure stuff out.
But I still have no idea how to remedy the Spare Low Pressure issue.
Anyone have any info what to do besides ignore it or start randomly changing out parts?
I've been reading my factory service manuals for a while, but lack access to diagnostic equipment that the local Jeep mechanics don't seem to be able to know how to use....
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