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Old Oct 25, 2025 | 10:38 AM
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Default Tpms

Has anyone installed aftermarket, front side marker lights and have it mess with the TPMS? Very strange issue I have. The front, right and left readings are good, BUT backwards. I even switched the wheels around and the readings are still backwards. The right reads as if it's on the left side and visa versa.
I'm going to cover them, from behind with foil and see if makes a difference. I covered the back of both markers, reset the TPMS, didn't help. Geeez!



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Old Oct 25, 2025 | 01:51 PM
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I thought about it, crap, I have a TPMS learn tool. How stupid. So I used the tool and set all of the tires, A,B,C,D, WOW, all the pressures were correct. Geeeez! Well, took it for a drive, parked it, WHAT? The front switched back to the wrong sides again. WTF!

Last edited by kodpkd; Oct 25, 2025 at 02:20 PM.
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Old Oct 25, 2025 | 05:56 PM
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I have not had your issue, but when I turn on the headlights on the right front goes to -------, turn the light off and reading comes back, something the LED screws with the frequency the TPS uses.
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Old Oct 26, 2025 | 09:25 AM
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I will try it. I should have checked when I had the side markers off.
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Old Oct 26, 2025 | 09:30 AM
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I thought for sure you were going to try it with the markers disconnected. Good test. Or maybe just use the light switch like the other poster.
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Old Oct 26, 2025 | 09:46 AM
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Originally Posted by BELVIN20
I have not had your issue, but when I turn on the headlights on the right front goes to -------, turn the light off and reading comes back, something the LED screws with the frequency the TPS uses.
My tinted aftermarket side marker lights do the same thing on my 2014. I just know it will happen if I drive with the lights on for a distance so it is not a surprise.
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Old Oct 26, 2025 | 12:48 PM
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There have been past threads on this. I *think* there are some brands of side-markers that cause problems and some that do not.
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Old Oct 26, 2025 | 01:26 PM
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I had a new TPMS installed in the right front. Reprogramed all 4 again, I turned the car on and off a few times and so far so good. A side story. I took the right front tire into the tire store. I had a nail in the tire, causing it to lose pressure very slowly. I talked to the manager about NOT scratching the rim. First of all, they screwed up installing the TPMS, it leaked air like a sieve, THEN I checked the edge of the rim, they freaking scratched it. They are fairly new black rims. WTF!
When I get my tire fixed right, this time, I will try a correct test drive.

Last edited by kodpkd; Oct 26, 2025 at 04:07 PM.
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Old Oct 26, 2025 | 02:22 PM
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My aftermarket LED side marker lights will occasionally cause the TPMS for my front passenger tire to stop working when I drive with my headlights on for an extended period of time.
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Old Oct 26, 2025 | 04:11 PM
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I have heard of this, but all 4 of my sensors always worked. Just the front two readings were backwards. Even when I switched the wheels around, it would read correctly for one drive, then pop backwards again.
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Old Oct 26, 2025 | 08:00 PM
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Originally Posted by Grand Slam
There have been past threads on this. I *think* there are some brands of side-markers that cause problems and some that do not.
Yup there sure have been. I went through this six years ago.

https://www.corvetteforum.com/forums...with-tpms.html
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Old Oct 26, 2025 | 08:51 PM
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Originally Posted by kodpkd
I had a new TPMS installed in the right front. Reprogramed all 4 again, I turned the car on and off a few times and so far so good. A side story. I took the right front tire into the tire store. I had a nail in the tire, causing it to lose pressure very slowly. I talked to the manager about NOT scratching the rim. First of all, they screwed up installing the TPMS, it leaked air like a sieve, THEN I checked the edge of the rim, they freaking scratched it. They are fairly new black rims. WTF!
When I get my tire fixed right, this time, I will try a correct test drive.
Scratched wheels are so common when doing tire work. The shops all have the tools to do the job with zero damage, but the tire monkeys just do not care and rush to get the job done. I got so sick of it, I bought my own tire changer and balancer to avoid dealing with the monkeys. Sorry to hear they damaged your wheel.
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Old Oct 27, 2025 | 09:33 AM
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What I don't get. They sell these fancy, black, expensive rims. Do they scratch them while installing them? WTF!
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Old Oct 27, 2025 | 09:43 AM
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Originally Posted by kodpkd
What I don't get. They sell these fancy, black, expensive rims. Do they scratch them while installing them? WTF!
Well no, they are not going to damage new wheels that they are selling because the customer can just say you damaged this one so I want a new one or the deal is off. So they make sure the one guy that knows how to do tires without damage does those new wheels.

When they damage the existing wheels on you car, you are pretty much stuck because they are not going to buy a new wheel for your car - at most they are going to have a wheel repair place touch up the scratch with spray paint. And a year later that is going to look like crap.
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Old Oct 27, 2025 | 10:51 AM
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Maybe it just that engineers and pilots are this ****! HA! Hillbillies, not so much.
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Old Oct 27, 2025 | 11:26 AM
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^ Engineer here, I can attest.
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Old Oct 27, 2025 | 11:38 AM
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Yes - I am also an engineer. But why should anyone accept damage to their wheels when it is entirely avoidable as long as someone doing tire work would just follow the procedures and use a little bit of care?

The tire shops around me do not follow the specific directions included with every tire machine that states never inside clamp an aluminum wheel. They also don't follow the directions on lining up the valve stem properly to avoid pinching and damaging the TPMS sensors. And the thing that causes most scratches on rims is not adjusting the "duck head" on the tire machine so that it does not scrape along the rim. The tire shops tell you the duck head has a plastic guard so it cannot damage the paint. That is BS - if the duck head rides on the rim, it is going to scrape up the paint.
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Old Oct 27, 2025 | 02:39 PM
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Well,,,, success!. I had to teach Big-0-tire how to install a TPMS. There are two washers, and what do you know, they have to go in a certain order, wow, who knew! The front TPMS's read on the correct side now.

Last edited by kodpkd; Oct 27, 2025 at 07:35 PM.
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Old Oct 27, 2025 | 02:53 PM
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Good information on thread. Didn't know this about the aftermarket parts.

OP: did the 747s you flew have TPMS? Just curious.
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Old Oct 27, 2025 | 04:59 PM
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Yes they did. 18 tires. Pressure and temp. They were kind of important.
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