General Motors has issued a new Service Bulletin for the 2027 Chevy Bolt, responding to customer reports that the all-electric hatchback can make strange noises at highway speeds.
The new Service Bulletin is marked as bulletin number PIC6650, and states that some drivers may notice a “groaning,” “buzzing,” or “whining” sound when traveling between 75 and 80 mph. The sound is reportedly most audible when the vehicle is coasting, not when accelerating or braking.
General Motors said the condition is currently under investigation and the primary cause of the noise is still unknown. However, the most visible detail of the noise when the vehicle is coasting may indicate that the condition may be related to the drivetrain or rotational components operating under low load conditions, although again, GM has not confirmed the specific source of the noise and stated that the engineering team is actively investigating the issue to develop an appropriate fix.
Because the root cause of the noise is still unknown, this bulletin is classified as preliminary information, not a finalized technical service bulletin. Importantly, GM is not instructing dealers to perform any repairs at this time. Instead, GM advises dealers to inform customers that their vehicles can continue to be driven normally, despite the noise.
Once a technician determines the source of the problem, the bulletin will be updated or replaced with a formal repair. There is currently no information regarding how many 2027 Chevy Bolt units may be affected by this condition.
As a reminder, General Motors recently revived the Chevy Bolt nameplate for a new generation, launching alongside the 2027 model year and citing strong customer demand for affordable electric cars. Compared to the previous model, the new Bolt has more horsepower, greater range and faster recharge times. In addition, the 2027 Bolt is the tenth vehicle equipped with the X76 electric drive motor GM Authority covered previously.
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