2020 Buick Encore GX electrical problems

Filed Sep 26, 2026 · Acceleration, Electrical · KS

While driving my 2020 Buick Encore GX, the vehicle experienced a sudden and dangerous loss of acceleration, immediately dropping into 'Reduced Engine power' limp mode in active traffic, but no other car was Infront or behind my car. A diagnostic scan revealed Diagnostic Trouble Code (DTC) P2138, which triggered the computer's safety override system to cut engine throttle. The official dealer repair invoice confirms a manufacturing and assembly defect covered under GM Technical Service Bulletin (TSB) #07-06-04-019G. The technician located water intrusion Panel/Body Harness Connector X112. The root cause was an improperly seated weather seal from the factory, which allowed moisture to short-circuit the accelerator pedal sensor voltage lines. The shop had to reposition the factory seal and apply dielectric grease to the terminals to correct the defect, for which I was charged out of pocket. This manufacturing defect caused a sudden, unpredictable loss of vehicle power on public roads, creating a severe rear-end collision hazard.

Filed Aug 29, 2026 · Electrical, Transmission · TX

The cluster display shows "shift to park" even while vehicle is stopped, gear shift in park position, and engine is off.

Filed Jul 22, 2026 · Electrical, Engine · IL

I am submitting this complaint regarding several serious mechanical and electrical issues with my 2020 Buick Encore GX that raise significant concerns about the vehicle's reliability and safety. Most concerning, I was recently informed by the dealership that my vehicle requires another transmission replacement, despite having the transmission replaced in 2024. I was also advised that I would need to pay for an additional diagnostic inspection because technicians discovered oil leaking through the lines, which appears to have contaminated engine components. According to the dealership, metal particles have been found within the engine, causing it to malfunction. They have stated that they are unable to determine the source of the contamination at this time. In addition to these major mechanical concerns, I am experiencing several electrical and system malfunctions, including: The passive keyless entry system does not consistently unlock the doors using the exterior door handle, even with a brand-new battery installed in the key fob. The vehicle repeatedly displays a "Shift to Park" warning even though the gear selector is already in the Park position. The vehicle continues to display brake-related alerts and notifications indicating that the brakes need to be serviced or replaced, despite having brand-new brakes installed. These ongoing issues have resulted in repeated repair costs, loss of confidence in the vehicle, and concerns about my safety while driving. The transmission failure occurring shortly after a previous replacement, combined with unexplained engine contamination and persistent electronic malfunctions, suggests there may be underlying defects that warrant further investigation. I respectfully request that these issues be thoroughly investigated to determine whether they are related to known manufacturing defects or warrant a safety recall or other corrective action. I also request that Buick review my repair history and provide appropriate assistance.

Filed Feb 20, 2026 · Electrical, Transmission · NC

My 2020 Buick Encore GX is showing a message with accompanying ding ding sounds "Shift to Park" after I put my car in park. This malfunction will not allow the car to be locked. I see there are many complaints and lawsuits that GM has not attended to. How do we get GM to initiate a recall on something they are and were well aware of.

Filed Nov 25, 2025 · Electrical, Transmission · IL

Shift into park warning when car is in park

Filed Sep 10, 2025 · Electrical · AL

When I put the car in park and go to turn off the car, I'm getting a "Shift to Park" error when the car is already in park. This error will not allow the car to shut off. I have to shift it back out of gear and then back to park several times before it will recognize that it's in park and allow me to turn off the car.

Filed Jan 28, 2025 · Airbags, Body · NE

I purchased a car from Carvana , a few days later the airbag light came on , I was instructed by Carvana to call the warranty place and let them no there was a problem. They instructed me to go to Levanders body shop in GrandIsland Ne . The body shop ran a diagnostic and could not find why the light was going off so they removed the passenger knee panel to which they found the wires were taped and the airbags and wire harness were missing , they decided to further check and found ALL the airbags in the car were missing and so were the wire harnesses.This obviously was not stated in the purchase of the car. Had that light not came on I still would not know. I drove it for a week with my child in the car thankgoodness i didnt get an a accident . i have pictures but it wont allow me to upload for some reason

Filed Dec 29, 2024 · Brakes, Electrical · TX

When I park the vehicle doesn’t recognize that I switched my gear to park and it won’t let me turn my vehicle off and when I have my foot on the brake it feels like sponginess

Filed Dec 10, 2024 · Electrical, Transmission · MO

For the past several months, my 2020 Buick Encore has been giving me a message to shift to park even though I placed my vehicle to park. This then does not allow my car to shut off, because it believes I am still in drive. I tried making an appointment with the dealership a month ago and their earliest availability was today, 12/10/2024. I took my Buick in, and they wrote me and stated that they figured out the issue and the shifter control would need to be replaced and was not covered under my powertrain warranty. I see this has been an issue on several Buicks and I even found the service notification Buick sent out for this specific issue. This is a definite safety issue since I cannot turn my vehicle off because it does not believe I am actually in park. This needs to be recalled for these vehicles since Buick is aware of the issue. I am getting the shifter control replaced, but due to it being a safety concern, it should be covered by Buick. Instead, this is being told to me that it is a $400 replacement part and not covered under Buick's warranty. I wanted to file a complaint so the federal safety agency can be aware of this issue.

Filed Dec 9, 2024 · Electrical · FL

The dash shows an error message "Shift to park" whenever I put the car in park. This message last for about 10 minutes or more locking me in the car. The car does not shut off until the error is gone. I have to continue starting up the car, placing it in park, then cutting it off to see if the message is gone.