Some manufacturer’s diagnostic equipment may detect a remap.
Many forward-thinking manufacturers turn a blind eye to a quality remapping service, knowing that a properly enhanced vehicle can only ever benefit them. The official line from most manufacturers is that if a modification causes a problem with the vehicle, then the part of the vehicle affected will not be covered under warranty, this does not mean a unilateral cancellation of the whole warranty.
Our best practice and advise is that if you ever need to take your vehicle in for warranty work, bring it back to us to flash on an original file. This way we can mitigate the chances of the remap being discovered.
Whether a manufacturer voids your warranty or not due to a remap is usually at the discretion of the dealership. For vehicles with aftermarket warranties, it is incredibly unlikely that a remap will be looked at or investigated.