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PEM second failure

Discussion in 'Roadster' started by guillaumef, Oct 4, 2018.

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  1. guillaumef

    guillaumef Member

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    I'm looking to buy a roadster with its first PEM. My guess is that the PEM will fail shortly. My question is the following. After PEM repair, is it known to fail again? In other words, was it just the first iteration of the PEM that needed fixing, or is it some kind of routine repair that is going to come every few years?

    And is it possible that there is a shortage of PEM eventually? What will happen after that? Thanks!
     
  2. X.l.r.8

    X.l.r.8 Supporting Member

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    I think you are second guessing the car. Mine still has its first PEM, 120,000km and I have no plans on replacing it. Unless it shorts out. then I'm got to repair it properly as a one time fix. Finding PEM's now is a problem so it will only get worse, however I have a lot of faith in my hot rod community. I am guessing in 5 years there will be programable PEM's off the shelf, water cooled and will allow more power to be pushed to the motor, will readily accept custom built battery packs and will have most of our issues properly sorted. Unless you suspect the car in question already has a problem I would worry more about what rear tires you are going to put on next.
     
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  3. Oricle

    Oricle Member

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    Hopefully someone will come out with some sort of kit that will use common parts from a Model3. They will be dime-a-dozen in junk yards in a few years.
     
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  4. guillaumef

    guillaumef Member

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    I'm reading a lot on repairs and the most costly one seems the PEM. If you don't do it soon, the battery pack could be bricked. So I'm a bit worried about that with the possible lack of parts, that's all...
     
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  5. X.l.r.8

    X.l.r.8 Supporting Member

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    Again I don’t see the correlation. The PEM doesn’t brick the battery. Most if not all that have repaired their PEM have not had an issue with the battery, your going to pull the plug straight away to remove the PEM. It’s a bone of contention on the PEM fan connector burning itself out, in turn overheating the PEM. Tesla traditionally replaces the PEM and asks no questions. The costly repair right now it the 12v board, that one scares me. Or the gearbox, I doubt you can get a replacement, although gears cut are not as bad as you would think. There is already aftermarket kit to put a model S engine with a Volt battery, that’s the start of a lot more to come. The reason the repair gets so much bandwidth was because until recent the only repair was to wave goodbye to the car on a flatbed and wave goodbye to $10k, now for $300 you can not only repair but improve it. That’s worth posting time and time again.
     
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  6. Bunnak

    Bunnak Member

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    As a potential buyer of a used Roadster myself, I could see why there is concern about the PEM. I don't mind getting the PEM fixed/replaced if Tesla had them. The problem is...if Tesla no longer makes PEMs then what are we to do?
     
  7. Roadster

    Roadster JdeMO Powered

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  8. Bunnak

    Bunnak Member

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    Thanks I’m in So Cal and close to Gardena. This Roadster group is so awesome!
     
  9. Bunnak

    Bunnak Member

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  10. X.l.r.8

    X.l.r.8 Supporting Member

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    Assuredly he’s reading this, or at least someone who works there is. I have had no dealings as far as purchases but they certainly have knowledge and can help a lot. Right now there pretty much the only other game in town but they have a lot of parts you may not be able to locate at the SC. They also sell just what you need. So if you want to replace the troublesome heat sink in the PEM, they will sell you just the heat sink material. You want to change that meddlesome plug for the fan, guess who will sell you what you need. They have their fans and haters and I suppose with good reason on both sides. Are they legit, they work on roadsters and have been around since the beginning, they have certainly made some mistakes but everyone learned from them and they shared the results. But as always YMYV
     
  11. supersnoop

    supersnoop Tesla Roadster #334

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  12. spaceballs

    spaceballs Member

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    I got an good ESS sheet from Gruber.
    I have bought an ESS battery sheet from them, worked fine.
     
  13. m0rph

    m0rph Member

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  14. Bunnak

    Bunnak Member

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    It sounds like you ultimately went through Tesla for battery, PEM and motor replacement, correct?
     
  15. m0rph

    m0rph Member

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    Correct. The car was not charging with the repaired PEM, and Tesla was unable to find the root cause of the problem. The car was at the SC for a whopping 1062 days...
     
  16. ExecMotorwerkz

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    @Roadster thanks for the Recommendation. @X.l.r.8 couldn't of said it better in a few years there will be more solutions for it. As they are available now PEM can be repaired. We also Repair Switch packs and I'm currently testing on repairing the roadster Drive Unit. It will get better on the years to come
     
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  17. Kerios

    Kerios Member

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    Personally I think the parts which are more concerning are the vehicle ECU/management systems, bespoke control systems, heater controller and anything else which which controls essential functions e.g. dash instrument pod which we don't have the original code for to replace, the PEM because it fails frequently has significant historic knowledge around it now, ditto battery.
     
  18. dhrivnak

    dhrivnak Active Member

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    I have a 2008 with over 50,000 miles and the PEM has been solid. While there have been some failures my impression is reliability has been good overall.
     
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  19. EricUSC

    EricUSC Member

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    The 2008 Roadster 1.5 PEMs are solid aren't known to fail.
     
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  20. gregd

    gregd Active Member

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    As an owner of a 2.0 Roadster, I worry about one of the reported failures, the insulation under the power IGBTs breaking down over time, leading to a sudden catastrophic failure. Are the 1.5's constructed differently in this regard?
     

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