Juicing up the P100D on a trip to Detroit

Tesla's customer referral program will come to an end on Feb. 1, chief executive Elon Musk said in a tweet Thursday.

The initiative lets drivers give their friends a referral code to get six months of free charging via Tesla's Supercharger network.

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Musk said the move was aimed at reducing costs incurred by the scheme. "It's adding too much cost to the cars, especially Model 3," he said.

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The premium electric auto manufacturer has made a number of cost-cutting moves of late, as it looks to boost margins and expand profitability. Late last month, the firm cut prices on its Model 3 car in China, while this week it discontinued the lowest-priced versions of the Model S sedan and Model X SUV.