Tesla Cybertruck electric motors replaced for early customers

Approximately half a year after the Tesla Cybertruck launched in the US, the EV brand has already begun replacing electric motors on some early examples.

Some owners of the Cybertruck pick-up have been contacted by Tesla to have an electric motor replaced free of charge with a new and improved version.

While details are thin, Tesla guarantees there's nothing wrong with the original electric motors, but the replacements have "improved efficiency and reliability".

The car maker says it's conducting a study of early Cybertrucks – but hasn't specified which electric motor is being changed, or why the study is being conducted.

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However, it's understood only a select number of customers are being invited to participate.

Though the exact price of the electric motors isn't known, on the older Model S sedan, Tesla reportedly charges $US6000 ($AU8900) for a replacement unit – before labour is added.

It's unclear whether this is simply a voluntary recall being masked as an upgrade, with some owners reporting loud front electric motors, while others have complained about vibrations from their powertrains.

"Tesla is conducting a study on the drive units in early Cybertruck vehicles, and your vehicle has been selected to participate," a message to owners read.

"At your next Service visit, and at no cost to you, Tesla will replace one of your current drive units with the latest production pedigree which is intended to improve efficiency and reliability.

"Note that this is not a cause for concern and that your vehicle is safe to continue driving in the meantime," the message concludes.

One of the owners selected was automotive journalist Kyle Conner, who is said to have one of the highest mileage Cybertrucks in the US.