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Will Tesla Void Warranty with the MPP Partybox?

play150

Member
Feb 25, 2021
44
15
USA
If I use the MPP Partybox to reduce obtrusive stability control on the track, will Tesla know and possibly use that to decline any warranty related work in the future?
 

MasterC17

Active Member
Dec 3, 2015
1,106
1,779
USA
Extremely unlikely. There is also a bypass you can install when you bring it in for Service. I guarantee you that 99% of employees have no idea who MPP is, or what a PartyBox is. They can also only void your warranty if they can provide the part failed as a direct result of the aftermarket equipment (they can't). Finally, if installed properly, the PartyBox is not going to cause any damage to the car.
 
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Mash

Supporting Member
Nov 10, 2019
860
653
Prague
PartyBox is not increasing power and not really increasing wear.
While it's a hack, I can't see what kind of warranty claim will be denied based on that.
But, still, do it at your own risk - you sign that paper there.
 
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dsgerbc

Member
Jun 4, 2019
466
325
Michigan
They can also only void your warranty if they can provide the part failed as a direct result of the aftermarket equipment (they can't).
This is extremely idealistic. Even in the less-aggressive-than-Tesla ICE modification world, the burden of proof is effectively on the owner, whatever the M-M act says.

In the real world at some point Tesla could blanket-void warranty on cars where they detect unauthorized software modifications (and possibly disable supercharging too) and you'd be left trying to sue them (if one bothered to opt out of binding arbitration).

I would advise people to stay stock software-wise if they are worried about warranty coverage.
 
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MasterC17

Active Member
Dec 3, 2015
1,106
1,779
USA
This is extremely idealistic. Even in the less-aggressive-than-Tesla ICE modification world, the burden of proof is effectively on the owner, whatever the M-M act says.

In the real world at some point Tesla could blanket-void warranty on cars where they detect unauthorized software modifications (and possibly disable supercharging too) and you'd be left trying to sue them (if one bothered to opt out of binding arbitration).

I would advise people to stay stock software-wise if they are worried about warranty coverage.

I think it is important to remember that no software is being modified - the PB and CPC are intervening through the Gateway to send or change already existing CAN messages. There's a pretty big differentiator there in my opinion. If you "hacked" into the vehicle modules and rewrote/modified code - yeah that would probably be something Tesla would take issue with.
 

dsgerbc

Member
Jun 4, 2019
466
325
Michigan
I think it is important to remember that no software is being modified - the PB and CPC are intervening through the Gateway to send or change already existing CAN messages. There's a pretty big differentiator there in my opinion. If you "hacked" into the vehicle modules and rewrote/modified code - yeah that would probably be something Tesla would take issue with.

Think about what that would mean in court.

Tesla Lawyer: "during a routine self-diagnostic we identified a discrepancy in CAN signals between different modules in safety-critical applications and flagged the car for a physical inspection next time when the car is in for service. During service inspection, we found evidence of tampering with on-board networks. Hence, the car has been operating outside of OEM specifications. The Magnuson-Moss act does not apply. I rest my case."

In general, ICE aftermarket has been telling their customers the 'Magnuson-Moss act protects you' mistruth for ages. The law applies to OEM-spec replacement parts and does not cover parts not up to OEM spec. The burden of proof in showing the part led to failure is only for OEM-spec parts.

I doubt M-M act is even relevant for Teslas. These are software products to a large degree, the EV-specific case law is probably pretty thin, and it's more likely that some software-type laws will apply before anything else.

So, this is also likely:
Tesla Lawyer: "We found evidence that the user tampered with operation of Tesla software, which is against EULA. So, we have prevented the modified software from interacting with our networks. Since the user operated the software without complying with EULA, we are not responsible for any hardware damage that might have occurred"

The ICE reflash sellers kept (and still keep) telling the same "our reflashes are undetectable" story for years. Except that it was generally a lie and a ton of people ended up with denied warranty claims.

Look, I'm not against modifications. But the 'you gonna pay to play' is the proper mindset. There's a non-trivial chance Tesla will catch you and make you pay.
Just think about it - Tesla already know every single customer who take their cars to the track. It should be pretty easy to screen those cars for discrepancies, if they wanted to. They *probably* won't bother, but you never know.

And to the 'it's just a signal tampering, not software modification' argument:
If you modified the thermal sensor signal in your PC to allow it to run hotter/faster to circumvent software throttling, do you think your burned out CPU should be covered?
 

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