Replace your TPMS metal valve caps!
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Cadillac STS Forum - 2005 through 2012 Discussion, Replace your TPMS metal valve caps! in Past Cadillac Vehicle Discussion; Just thought I'd mention this so you don't run into the same problem (especially applies to members in the colder ...
  1. #1
    madtuner's Avatar
    madtuner is offline Cadillac Owners Member
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    Replace your TPMS metal valve caps!

    Just thought I'd mention this so you don't run into the same problem (especially applies to members in the colder climates). 3 out of 4 of my metal TPMS valve caps have seized over the last winter (tires replaced in November) and all 3 stems broke upon attempting to take them off. Do yourself a favor and put some plastic caps on. Also, if you replace your TPMS, triple check your part number. There are about 3 different ones available and they will not interchange. Don't ask how I know!

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    EChas3's Avatar
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    Re: Replace your TPMS metal valve caps!

    I use the plastic caps my replacement sensor came with but my OEM's still have the original metal ones. The corrosion results from different types of metal in contact. I don't think the OEM's should have this issue, aren't they all aluminum? Mine don't resist me when I remove them to adjust pressures for temperature changes.

    I find a lttle less than a pound of variation per 10 degrees ambient temperature. One more reaon Wisconsin's Summer is too short. Soon, I'll be fiddling with pressures every couple weeks!

    Since mid-June, I've been running 31 psi rear & 33 front. Higher than that in the rear doesn't provide the feel I like under power in a turn on uneven pavement.

    Opinions vary.

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    Re: Replace your TPMS metal valve caps!

    I've had no issues with OEM caps that are metal across the 2 SRXs, STS, Deville cars that I've had.

    I also recall hearing at some point that the metal cap is used as part of the antenna of the sensor for transmitting to the car.

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    dkozloski's Avatar
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    Re: Replace your TPMS metal valve caps!

    The stock valve caps are aluminum and don't cause trouble. Stainless caps are bad news. When the salt of winter gets on them, etectrochemical corrosion takes over and the aluminum valve stem sacrifices to the stainless cap. The result is disaster. Use only caps that you are sure are aluminum or use plastic/rubber.
    Don't mess with Binky Bear!


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    Re: Replace your TPMS metal valve caps!

    I had some seizing problems on my '06 (aluminum caps); after I got them off, I used a little silicone grease on the threads and removal then was effortless. I currently have an '11 and the factory caps are now plastic (so no problems).

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    Re: Replace your TPMS metal valve caps!

    Quote Originally Posted by dkozloski View Post
    The stock valve caps are aluminum and don't cause trouble. Stainless caps are bad news. When the salt of winter gets on them, etectrochemical corrosion takes over and the aluminum valve stem sacrifices to the stainless cap. The result is disaster. Use only caps that you are sure are aluminum or use plastic/rubber.
    I had the stock aluminum caps.

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    Re: Replace your TPMS metal valve caps!

    Quote Originally Posted by dkozloski View Post
    The stock valve caps are aluminum and don't cause trouble. Stainless caps are bad news. When the salt of winter gets on them, etectrochemical corrosion takes over and the aluminum valve stem sacrifices to the stainless cap. The result is disaster. Use only caps that you are sure are aluminum or use plastic/rubber.
    Good to know, I've been using stainless steel caps for years and never given that any thought. Looks like back to plastic for me. I did notice that the new vehicles seem to be coming with plastic caps. I keep seeing blue, green, gray, and even red plastic caps.

  9. #8
    scott9001 is offline Cadillac Owners Fanatic
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    Re: Replace your TPMS metal valve caps!

    Chryslers are even worse for this I've replaced Chrysler ones that only had like 20,000 on the car and were only a year old

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    ddgm is offline Cadillac Owners Fanatic
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    Re: Replace your TPMS metal valve caps!

    Happened to me a few years back. Someone replaced the stock caps, I very easily twisted one off. I carefully slit the other 3 off with a dremal & thin rotary disk.
    Plastic caps for me.

    Doug

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