Tesla has been ordered to recall nearly 4,000 of its Cybertrucks due to an accelerator pedal that can stick in place when pressed down.

The cause, according to the regulator: soap.

“An unapproved change introduced lubricant (soap) to aid in the component assembly of the pad onto the accelerator pedal. Residual lubricant reduced the retention of the pad to the pedal,” the NHTSA wrote in the recall document.

Tesla will recall nearly 3,900 Cybertruck pickups because of defective accelerator pedals that could dislodge, causing the vehicles to unintentionally accelerate and increasing the risk of a crash, according to a filing Friday, after Tesla halted Cybertruck deliveries last week amid speculation the models were affected by faulty pedals.

The recall affects 3,878 Tesla Cybertruck vehicles manufactured between November 2023 and April 2024, according to a National Highway Traffic Safety Administration filing.

Tesla has voluntarily recalled all of the nearly 4,000 Cybertrucks it has sold over faulty accelerator pedals that risk causing fatal accidents, the National Highway Traffic and Safety Administration confirmed on Friday.

According to a safety recall report by the NHTSA, the pad on the accelerator pedals of affected Cybertrucks “may dislodge, which may cause the pedal to become trapped in the interior trim above the pedal.”

The issue increases the risk of a collision as the driver loses the ability to properly use both the accelerator and the brake pedals.