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  1. #1
    RomansRoad's Avatar
    RomansRoad is offline Porsche Prophet
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    TPC (TPMS) issue

    Searched but couldn't find this answer. 07 with 68K in Texas heat. Started getting periodic "TPCicon Inactve" messages, then it would boot up. Tried reset, no joy. Have changed battery (main OEM under hood) this summer and had no issues with TPC. Now get it working and later inactive at random times, but most lately get all four tires with no reading.

    Question is: I know the sensor batteries are suspect, but how does one tell whether it is the reciever ($$$) vs. the sensors ($) ?

    Thanks!
    Mac

    07 Black Cayman
    08 Black Maserati Granturismo


  2. #2
    gougoushu is offline Porsche Enthusiast
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    Re: TPC (TPMS) issue

    I just went through this problem with my car, which is the same as yours: an 07 base with 64k miles.

    I noticed that one of the four tire readings would go blank first (left rear), so there would be three numbers displayed. In the position for the left rear, only a "--" would appear. Within minutes, I would see the "inactive" message, and all 4 readings would show the "--"

    I replaced just the one sensor, and all is working properly again. I bought an extra sensor for when the next one goes.

    Relatively older and higher mileage cars like ours are starting to show this now. I suspect the problem on your car is not the receiver, but the sensors, because the sensors are near the end of their useful life. And it sounds like at least two of your sensors are bad.

    The theory goes that using the car wears down the batteries in the sensors more quickly, so cars with fewer miles aren't having as many TPMS issues yet.

    When you buy the sensors, check the dates printed and stamped on them. They have a limited shelf life.

  3. #3
    drPhilGandini's Avatar
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    Re: TPC (TPMS) issue

    You should read this thread:
    http://www.planet-9.com/cayman-boxst...one-weird.html
    especially my post toward the end. I have written an article on replacing the sensors.

  4. #4
    RomansRoad's Avatar
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    Re: TPC (TPMS) issue

    Thanks to both of you for your thoughts. I did see the article, and wasn't sure if I've lost input from all sensors, which one(s) I should replace.

    It appears that only the specific part#997.606.021.00 will work in the 07, but others have used the 433Mhz part #....01 with good result. All of them are a bit $, but I do like having the info, and don't like seeing the yellow tire light all the time. Any thoughts on using the 2008 sensor #...01?

    I'll be due for tires soon, so I guess I'll replace them 2 by 2.
    Mac

    07 Black Cayman
    08 Black Maserati Granturismo

  5. #5
    drPhilGandini's Avatar
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    Re: TPC (TPMS) issue

    Contact Jim at TireRack. He set me straight. You should do it when you replace the tires (I know, I missed by about 3 months...)

  6. #6
    Dloines is offline Porsche Activist
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    Re: TPC (TPMS) issue

    Had almost the same problem about 2 months ago, the right side frnt and rear no reading. I ended up replacing all 4 sensors, i'm hearing that 5-6 years is the batttery life, and the the battery is part of the sensor so you have to replace the entire unit. My extended warranty did cover the costs...

  7. #7
    DocSteve's Avatar
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    Re: TPC (TPMS) issue

    Mine just started doing the exact thing as the poster.. I do have metal valve caps but 3 work fine (LR acting up) and sytem inactive shows with flashing tire. I hear the batteries should go 7-8 yrs ? I'll try plastic caps and see if there is any difference.

    Anyone found a lower cost alternative for the sensors?? Thx!

  8. #8
    drPhilGandini's Avatar
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    Re: TPC (TPMS) issue

    I think 7-8 years for battery life is a stretch. Battery technology has improved dramatically, but batteries from 5 years ago were still pretty crappy by today's standards. I'd say 5 years is a reasonable estimate with some lasting longer, but remember all batteries suffer in the cold, so some will start giving problems this winter. Others won't notice until next summer or winter, depending on how often you drive your cars.
    If there's a cheaper alternative, I couldn't find it...

  9. #9
    Lazerred's Avatar
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    Re: TPC (TPMS) issue

    I'm so old I can remember when cars didn't have a TPMS. We had to maintain the pressure the old fashioned way, a tire guage. I imagine when my sensors go out, I'll just check the tires often like I did (and do on my old Corvette) on my cars without a sensor and save the money for a more fun upgrade.

  10. #10
    drPhilGandini's Avatar
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    Re: TPC (TPMS) issue

    Lazerred, you might want to do that, but I hope the warning light on the dash doesn't drive you crazy! My batteries died and I couldn't stand the idiot lights for more than a few days before I lay down the long green to get new sensors. Of course, that's what happens when my OCD comes out to play.

  11. #11
    Lazerred's Avatar
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    Re: TPC (TPMS) issue

    Wonder if there is a way to disable the lights? That's a lot of money for something to tell me what I can find out for myself.
    Last edited by Lazerred; 12-19-2011 at 05:00 PM.

  12. #12
    rsg's Avatar
    rsg
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    Re: TPC (TPMS) issue

    Is it possible to deactivate the TPMS via the Durametric Pro?

  13. #13
    drPhilGandini's Avatar
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    Re: TPC (TPMS) issue

    Quote Originally Posted by rsg View Post
    Is it possible to deactivate the TPMS via the Durametric Pro?
    Not that any of us have found, yet. I called Durametric and they said that they had never tried to do it - which surprised me since they actually mention that it can be done, but they said to me that if they actually tried to change every parameter on every car that they thought their software might influence they'd be busy all day, every day.
    There's another guy on Planet 9 who tried to do it and so I have actual evidence that two qualified and experienced Porsche mechanics with the Pro software have been unable to deactivate TPMS.
    There are a number of threads on this topic, including the one I linked to above. There's way more information in those threads that probably doesn't need repeating here.

  14. #14
    rsg's Avatar
    rsg
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    Re: TPC (TPMS) issue

    There are guys in the other forum who said that they were able to get Suncoasticon to disable it via the piwis. I would imagine if the dealer can do it that it is possible via the durametric pro, but no one has figured it out yet.

  15. #15
    PistolPete's Avatar
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    Re: TPC (TPMS) issue

    I wonder if dealers shy away from doing this due to liability issues similar to refusing to disable the airbag warning if you install aftermarket seats.

    I can picture a situation where a tire blows due to low pressure (remember the Ford Explorer Firestone fiasco?) and the accident investigators find out that the Federally mandated system was disabled...
    Pete
    2008 Meteor Grey Cayman S
    2007 Blue Slate Infiniti G35s 6-speed

  16. #16
    pscherer is offline Porsche Person
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    Re: TPC (TPMS) issue

    Same issue here. After 20 or so miles the system is still learning, which makes me suspect a defective sensor. Tire companies say they can diagnose bad sensors and replace them. Has anyone used a commercial tire company to do this or are Porsche's too specialized for the neighborhood dealer.

    Also, the was a reference to documentation how to replace the sensors yourself...is this a DIY project or would you advise against it.

    Thanks

  17. #17
    PistolPete's Avatar
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    Re: TPC (TPMS) issue

    Quote Originally Posted by pscherer View Post
    Also, the was a reference to documentation how to replace the sensors yourself...is this a DIY project or would you advise against it.

    Thanks
    Do you have access to a tire mounting machine & balancer? The tire has to come off to replace the sensor.
    Pete
    2008 Meteor Grey Cayman S
    2007 Blue Slate Infiniti G35s 6-speed

  18. #18
    pscherer is offline Porsche Person
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    Re: TPC (TPMS) issue

    Quote Originally Posted by PistolPete View Post
    Do you have access to a tire mounting machine & balancer? The tire has to come off to replace the sensor.
    No I don't so that answers the DIY question, thanks

  19. #19
    mike_balt is offline Porsche Chatter
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    Re: TPC (TPMS) issue

    Question about replacement parts - Do we have enough information to determine whether this is the type of part that we really need the OEM or are aftermarket sufficient. Want trouble free operation, but if aftermarket are quality, no reason to throw away the money. thoughts?

    I see Tire Rackicon has aftermarket for $340
    ww.bavarianx.com has the BERU ones for $459
    Shop TPMS Tire Pressure Monitor Sensor and Tool Supply has what they say are OEM replacements for $420, but they are orange and I believe the factory ones are grey. so I don't think they are OEM

  20. #20
    Eugene4eva's Avatar
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    Re: TPC (TPMS) issue

    Why dont you check out americas tire or discount tire?
    I got tpms from them about six mos ago when i mounted new wheels and tires, only because i was planning on using my original wheels and they work great!
    Bought them less than 150 a set.
    2010 Boxster, Borla Exhaust, Cayman Spoiler, H&R Springs, Forgestar F14 19" on M. SuperSport

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