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TPM Confusion Lazy Question

788 Views 9 Replies 7 Participants Last post by  oemtech
I should have been concerned when they ordered the same size tire for all four wheels. After that was sorted out I got the rubber and the alignment and drove away a bit poorer, but happy.

Now, a month later and it's getting hotter, so I figured I'd go over the car, checkk fluids and stuff and tune in the tire inflations back to factory spec. And that's when after a bit of head scratching (a very little bit) I discovered that the right front TPM is reporting to the left on-screen indicator and the left front TPM is reporting to the right on-screen indicator.

I believe that this is addressable from the driver's seat, but I don't remember how to do it. Can someone please spare me the research and point me in the right (or left) direction? Thanks in advance.
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I bought the official EL-50448 TPMS tool from the supplier to GM back in 2008 when I bought my CTS but now you can pick up a Chinese clone of one on Amazon for around $14 which is probably a fifth or less of what I paid. And I am sure mine also originated in China but at that time the only choice was the official GM supplier.

If you rotate your own tires it is worth having HOWEVER most of the newer cars don't need a relearn tool (i.e. my 2016 Corvette and 2018 GMC Denali automatically learn without prompting from a tool) so depending upon how long you plan to keep your ATS it may not be worth fooling with.

The signal from the TPMS sensors is pretty weak so you can't do the relearn if there is something else on the same frequency nearby. Once I installed a new garage door opener I have to drive my ATS down the driveway after switching between summer and winter all season tires because the garage door opener interprets the TPMS tool as an attempt to communicate with it and its challenge reply is considerably stronger than the TPMS sensors which "de-senses" the TPMS receiver in the ATS and prevents pairing.
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