Which parts fail
Components named in complaints (automatic and manual transmissions, CVT, axles, driveshaft, 4WD/AWD).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2018 Chevrolet Volt owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2018 Chevrolet Volt. The contact stated that while the vehicle was parked and shifted to park(P), the message "Shift to Park" was displayed on the instrument panel and the vehicle was inoperative. The contact stated that the vehicle was operative while in low power mode; however, the vehicle intermittently failed to charge in low power mode. No warning light was illuminated. However, the vehicle displayed the full battery icon on the display, but 1 EV Mile. The vehicle was taken to an independent mechanic where it was diagnosed that the battery energy control module needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 11,000.
The contact owns a 2018 Chevrolet Volt. The contact stated that while the gear shifter was in PARK, the shift to park warning light illuminated and the vehicle failed to turn off or change gears. The vehicle was taken to the dealer where it was diagnosed that the gear shifter assembly mechanism failed and needed to be replaced. The vehicle was repaired however, the failure recurred. The manufacturer was not notified of the failure. The failure mileage was approximate 28,995.
The contact owns a 2018 Chevrolet Volt. The contact stated that after coming to a complete stop and shifting into park(P), the message "Shift to Park" was displayed. The contact stated that the transmission shifted to park(P) after several attempts to park the vehicle. The contact then turned off the vehicle. The local dealer and the manufacturer were not notified of the failure. The vehicle was not diagnosed nor repaired. The failure mileage was 25,000.
When you put the car in Park, the engine would NOT shut off and the car kept sending a message that I needed to shift to park, but I already was in park. I shifted in and out of park to drive to reverse, but every time it went back to park it said I needed to shift to park. I was in my garage, could NOT leave the car running all night as the battery would be dead by morning, but couldn't shut it off either. I drove it immediately to the dealership and they reproduced and confirmed the problem, repaired it on Tuesday. Fortunately, I was at home, but had I been anywhere my safety and others could have been at risk, because I could have been in an unsafe place late at night, unable to shut my car off and/or get out of my own car. You are unable to put gas in a running vehicle, and I could have been stranded. …
Vehicle is 2018 Chevrolet volt with approx 91000 miles, purchased new in California with both PZEV and Voltec warranties in place. Vehicle produced MIL in December, in Colorado, with exterior temperatures ~30 degrees, after attempting to remote start. The resulting OnStar Codes P1AEE, P1AEF, and P0AC4 indicating "the electric propulsion system is not performing as expected. Please service immediately." Drove the vehicle to the nearest dealership assuming there could be an unexpected loss of power. Identified PIC6285B as trouble shooting aid for the dealership. The dealership stated they contacted their GM TAC representative and the service foreman and TAC agreed the vehicle needed a transmission flush. No indication that the work would be covered by the bulletin found. …
In August 2023, while driving on I-93 in Boston, car switched from Battery Mode to Engine Mode, and Driver Information Screen reported "Reduced Propulsion". Propulsion Battery charge and gasoline fuel levels were adequate such that this should not have happened. In this Reduced Propulsion state the environmental systems, i.e. Heat/Defrost/AC, become inoperative. A thunder storm overhead was pouring cold rainwater on the windshield and it became fogged inside from condensation. Because windshield Defrost was not functioning my passenger and I had no recourse but to frantically grab whatever we could to wipe away the condensation and keep some small amount of road visibility. This problem is intermittent. Car is available for inspection upon request. Reduced visibility in a moving vehicle is a safety hazard to the driver and all those in their vicinity. …
I was driving my 2018 Chevy Volt at about 30 mph on EV mode. The battery was at 50%, the car was performing normally. Then the battery jumped to 100%, the check engine light came on, and the vehicle lost power. I was in rush hour traffic and unable to get the vehicle to go faster than 5-10 mph. I switched to "normal" mode to engage the gasoline engine, hoping this would help but it did not. The gas engine RPM fluctuated wildly and did not restore the ability to accelerate the vehicle. I was still unable to go faster than 5-10 mph. I was a few blocks from home and managed to get home safely. The engine code was P1E00. I put the vehicle on the charger and it seemed fine the next day. This exact situation I ran into - reduced engine power - is addressed in Special Coverage N232432680, which includes this vehicles VIN. …
On June 27, 2025, while driving, the vehicle displayed a "Propulsion Power Reduced" warning message and a Check Engine Light illuminated. I immediately experienced a loss of power. I brought the vehicle to an authorized Chevrolet dealer the same day. On July 1, 2025, the dealer diagnosed the failure as a faulty Battery Energy Control Module (BECM) and high-voltage system fault (Code P1E00), requiring a full replacement of the high-voltage battery pack (Part #24296900). The manufacturer (GM) was contacted, and the replacement battery was ordered on July 2, 2025. As of December 2025, the vehicle remains in dealer possession (over 5 months) with no repair completed. The manufacturer has stated the part is on indefinite backorder with no ETA. The failure of this component renders the vehicle inoperable and presents a safety risk due to sudden loss of propulsion power while in motion. …
For a few weeks, I had been getting a "Shift To Park" messaged when I tried to power off my car after putting it into park. Like others, I was able to jiggle the shifter and press down hard to get it to recognize it was in park. Last week while I was driving at about 50 mph, the "Action Required: Shift to Park" message appeared and my check engine light turned on. The car stopped responding to acceleration so I immediately pulled off the road. I couldn't turn the car off, I couldn't drive the car, so I was stuck on the side of the parkway. After about 10 times of moving the shifter through all the gears and pressing the power button, the car finally turned off but then I had to get towed. I am lucky that I was driving in the right lane and was able to pull of immediately or otherwise I would've been stuck in traffic with cars coming by at 50 mph. …
My 2018 Chevy Volt displayed a warning message of "Propulsion Power is Reduced" on the dash when I started the car in a parking garage on Saturday, March 9th around 10am. The car would not drive normally and made a strange noise. I had to stop and start the car six or so times before it drove normally for me to get home. Had this happened at high speed, it could have caused an accident or worse. I contacted the local Rockville, MD Chevrolet dealership and they ran the diagnostic test on the BECM and HPCM2 systems and performed battery capacity reset. I do not believe this software reset will correct the technical issue. According to the dealership records, such a software reset was performed in 2021 by the previous owner before we purchased the car second hand in July, 2022. …
Transmission complaints in other Volt years
Frequently asked questions
How common are transmission problems on the 2018 Chevrolet Volt?
NHTSA has 85 complaints about the transmission & drivetrain of the 2018 Chevrolet Volt, 38% of the model year's 225 complaints. The component named most often is automatic transmission › lever and linkage › floor shift (7 mentions).
Is there a recall for 2018 Chevrolet Volt transmission problems?
No. NHTSA lists no transmission & drivetrain recall for the 2018 Chevrolet Volt, though it has 2 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 2018 Chevrolet Volt transmission problems start?
Half of the complaints with a recorded mileage happened before about 24,000 miles, and 55% before 25,000 miles.
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.