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Stock JK TechBulletin board forum regarding issues with OE (original equipment) components of the Jeep JK Wrangler (Rubicon, Sahara, Unlimited and X) such as factory suspension parts, engine, transmission, body parts, interior fixtures and the on-board computer.
Jeep uses internal TPMS, and yes there is one on the spare, I drove myself nuts when the sensor went off and all 4 of my tires were properly inflated... i finally checked the spare
I know the spare has one, but I think it isn't read the same as the others admit is not moving. I snapped a valve stem off, offroad. Changed the tire and light never came on. Tire was flat as a pancake. I know tpms wasn't broken as I still use it!