Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2017 Chevrolet Bolt EV owners, lightly cleaned up (personal details are redacted by NHTSA).
While slowing to a stop, the vehicle suddenly experienced multiple (3-4) violent jerks. The vehicle fought against my firm brake pedal application, overpowered the brakes, and accelerated uncontrollably, resulting in a crash. During the impact: The driver frontal airbag and pretensioners deployed. The driver seatbelt unlatched mid-impact and then locked/retracted in a way that prevented it from latching again, even while I was sitting in the driver's seat post-crash. I have only been provided with the limited Airbag Control Module (SDM) data, which shows the brake switch as "Off" and low accelerator pedal readings. This data does not match the events I experienced. I have formally requested full downloads from all other modules (Powertrain/PCM, ABS/EBCM, BCM, etc.) from both the insurance company (ESIS) and GM, but they have only provided the single SDM report. …
On August 17th, 2025, my wife was driving our 2017 Chevrolet Bolt EV at low speed, pulling into a parking spot. The vehicle suddenly accelerated forward with enough force to cause significant damage to a fixed barrier. She does not recall pressing the accelerator at that moment. The degree of acceleration was disproportionate for a brief accidental press. Immediately after impact, smoke or dust was visible rising through the center console area. No airbags deployed, but it appeared similar to smoke from pyrotechnic devices. My wife sustained seatbelt-related bruising across the chest and thighs. The vehicle remains drivable. I have included photos detailing damage to the car and the fixed barrier. We are aware of the GM accessory all-weather floor liner recall (21E-089), but are not certain if our vehicle's liner was part of that campaign. …
Exact details UNKNOWN. Description: About 2 yrs ago, releasing the brake pedal started triggering rapid popping sounds from engine compartment. The popping sounds are rapid--maybe 4 or 5 per second--and continue for a few seconds or more, up to at least 30 seconds depending on ambient temperature and main battery charge level. Opening the driver side door following vehicle at rest can also trigger this popping noise. But mostly the popping occurs when brake pedal is fully released during operation of the vehicle. GM responded initially to reports of this issue by replacing brake control parts; but more recently, according to a service bulletin (see uploaded document), a software update may be used to fix the problem. Since many vehicles which have the problem are out-of-warranty, GM charges owners for applying this software update. …
In Sept 2020, GM issued Service Bulletin 20-NA-170 regarding rapid popping or clicking noises coming from the I-Booster hardware under the hood in the braking system. Earlier fixes for this issue involved replacing the I-Booster hardware, but that didn't solve the problem. The new fix called for a software update to the Brake Booster Control Module. The Bulletin states: "Correction -- DO NOT replace the I-booster assembly. Update the Brake Booster Control Module with the latest software." I reported this brake/electrical system issue to NHTSA on April 24, 2022 (# 11461966) and January 25, 2023 (# 11503678), and have had no response or investigation by NHTSA regarding the hazard of this software defect. When the hardware eventually fails--and it will due to 1000's of unnecessary use cycles--what happens to the braking system?
In Sept 2020, GM issued Service Bulletin 20-NA-170 regarding rapid popping or clicking noises coming from the I-Booster hardware under the hood in the BOLT braking system. Earlier fixes for this issue involved replacing the I-Booster hardware, but that didn't solve the problem. The new fix called for a software update to the Brake Booster Control Module. The Bulletin states: "Correction -- DO NOT replace the I-booster assembly. Update the Brake Booster Control Module with the latest software." What happens to the brake system if the software update is not applied? Does the I-Booster hardware eventually fail because of the 1000's of unnecessary use cycles, and then what happens? Why hasn't a recall been issued for this possible safety issue caused by a software defect?
There is an intermittent RAPID TAPPING NOISE COMING FROM THE BRAKE BOOSTER upon opening a door, or releasing the brake pedal (standing still or while in motion), or unplugging the power cord. The behavior is more frequent on colder days. This tapping noise typically continues for nearly a minute. Tapping the brake pedal causes the noise to cease momentarily. Very slight movement on the brake pedal can sometimes stop the tapping. This behavior began more than a year ago. I took the car to the Chevrolet dealer and was told a firmware update would be provided in Q1 2021. I am concerned the behavior may be an early warning sign of brake system failure, which could occur while driving.
Parking button may not fully engage when pressed causing vehicle to roll forward in drive gear or while in reverse causing vehicle to collide. Vehicle will automatically go into park when driver door is opened, but button can take deep press to fully engage into park. If driver removes foot from brake petal before vehicle is in Park car moves.
1. Steering, the steering gear does not return wheels to straight position when exiting a turn, I need to forcefully move steering wheel from a turn back to a straight position. 2. Brakes, after hitting brake a knocking sound is heard. Also does this when car is off and opening and closing doors, was told this is a brake actuator problem.
When using mechanical brakes the iBooster makes a knocking noise. Every time the brake pedal is used the noise appears. This is concerning as I'm afraid it may impair the brake faction and potentially create a danger on the road. So far dealers are unwilling to help.
This tends to only happen below 74 degrees Fahrenheit and happens excessively between 72 and 74 degrees Fahrenheit. While driving with one pedal engaged (labeled as low on the shifter since they re-used another model's shifter for the first several years of the Bolt EV), the cruise control will randomly disengage and force the vehicle to immediately slam on the brakes. Usually its not a big deal, but when it happens at highway speed as you're just passing a semi or large vehicle and merging back into the lane in front of it, it becomes dangerous very quickly, which has happened a couple of times now. I would venture a guess that its not related to the cruise control directly, but some system that its relying on is forcing it to deactivate the cruise control. …
Brake complaints in other Bolt EV years
Frequently asked questions
How common are brake problems on the 2017 Chevrolet Bolt EV?
NHTSA has 22 complaints about the brakes of the 2017 Chevrolet Bolt EV, 6% of the model year's 349 complaints.
Is there a recall for 2017 Chevrolet Bolt EV brake problems?
No. NHTSA lists no brakes recall for the 2017 Chevrolet Bolt EV, though it has 4 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2017 Chevrolet Bolt EV brake problems start?
Half of the complaints with a recorded mileage happened before about 24,000 miles, and 60% before 25,000 miles.
Is it dangerous?
Owners linked 3 crashes, 0 fires and 1 injury to brakes problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.