Solving my truck’s TPMS sensor problem with the help of an RTL-SDR dongle

Re:Solving my truck’s TPMS sensor problem with the help of a... by jdeibele on Monday August 22, 2022 @05:28PM (#32557522)

I was told by two different tire places that my wife's car (2015 CX-5) uses the ABS sensors to detect if one wheel is spinning differently than the others. A flat tire rotates faster than one full of air because it's smaller.

I had the warning light come on twice recently: once, I pulled over to the shoulder when an ambulance was approaching. As I accelerated to get back on the highway, the warning light came on. I thought I'd run over a piece of glass or something. Using the gauge showed nothing wrong. Reset the TPMS.

Later, we were starting on a 30-mile drive down a gravel road in Eastern Oregon. The TPMS light came on. I took a deep breath, kept driving and after we reached our destination, I reset the TPMS and it hasn't come on since.

My conclusion is that I accelerated too quickly on the shoulder and some gravel or debris made a wheel spin faster. The second time, there was presumably more gravel on one side of the car and again one of the wheels spun faster.

My wife's car is 2WD. I wonder if either would have happened in an AWD.

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Re:Solving my truck’s TPMS sensor problem with the help of a... by rconti on Monday August 22, 2022 @06:03PM (#32557873)

Nah, it's probably not slight wheelspin because that would be a normal case that's handled by traction control. It wouldn't make sense for the system to both control wheelspin with traction control AND report it as a low tire pressure condition. Presumably the TPMS alert would be triggered by a longer term rotational difference. It happens for all kinds of reasons (eg, going into colder temps).

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Re:Solving my truck’s TPMS sensor problem with the help of a... by mey on Tuesday August 23, 2022 @12:52AM (#32560596)

I have a CX-5 2016, and done things like overheated the transmission in loose sand. Never had the TPMS come on from wheel slippage.

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Re:Solving my truck’s TPMS sensor problem with the help of a... by maxerickson on Tuesday August 23, 2022 @05:02PM (#32571462)

My car uses ABS for it and the light goes out after something like 10 seconds of non detection above 30 mph.

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Re:Solving my truck’s TPMS sensor problem with the help of a... by KennyBlanken on Monday August 22, 2022 @08:33PM (#32559142)

You likely have an ABS sensor issue - the wheel-speed sensor systems don't get triggered that quickly.

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