Vehicle through a "service engine" and lost partial power. The vehicle slowed considerably and was not able to accelerate as expected. Fortunately, this was rush hour traffic and it was slow. Normally, the traffic moves at 60 MPH plus or minus 5 MPH. The loss of power on I10 can be extremely unsafe. The dealer revealed that our car had a scan code P0299. They cleaned the Thottle Body and stated it was the likely problem. However, they said they tested the crank case pressure and it was at 0 PSI, instead of the expected vacuum. There was no indication, that crank case pressure or the PCV was the root problem. I pointed out that crank case should be measured in INH2O. I think they mis diaganosed and were trying to lead me to replace the PCV, and ultimately the turbocharger itself. I think it is probably a sensor or perhaps another component. I took my car away from the lot and will report any other incidents or findings.

- Jacksonville, FL, USA

I put the car in park and it says a message that says shift to park but I am in park already and now my battery keeps draining and the lights on shifter blink continuously when I-€™m in park if I click shift button the message goes away but I don-€™t think it should be doing this and I-€™m not the only person from what I have read.

- Forest City, PA, USA

The contact owns a 2020 Chevrolet Malibu. The contact stated that while driving at an undisclosed speed, the engine revved loudly while coming to a stop. Additionally, the vehicle lost motive power while driving uphill. The vehicle was taken to the dealer, and the dealer confirmed that the vehicle performed as designed. The vehicle was not repaired. The manufacturer was not made aware of the failure. The contact related the failure to Technical Service Bulletin: 21-NA-004 (Continuously Variable Transmission). The failure mileage was 27,344.

- New Albany, IN, USA

Shift to Park Alarm will not stop beeping. Looked into it on the internet found it to be a known issue with GM. Can prevent the doors from unlocking and would drain battery and annoyance. Replaced shifter assembly at a cost of $567.28 I believe GM knows of the issue and should recall the defective parts. I am making this complaint on behalf of my 85 year old Mother that purchased the 2020 Malibu with the remaining 3 year/36000 miles warranty. In November of 2022 she had the Alarm Shift to Park come up and would not stop. I return the car to the shop where she purchased it, expecting the issue to be covered by warranty. I found out the car was put in service in August of 2019 making the warranty expired. The mechanic that replaced the shifting assembly explained the problem to me and gave me the defective part. When researching the problem I found that GM it aware of the issue and should recall and fix the problem. I have contacted GM but they refuse to reemburse me. I filed a complaint with the BBB and I see that there is a class action lawsuit over this issue. I have my complaint on file in hope that GM will voluntarily recall or be forced to if enough people complain.

- Saukville , WI, USA

Shift to park error, No power to car, reduced engine power, camshaft positioning error, brakes failed (completely went hard unable to press) almost causing crash.

- Reidsville, NC, USA

The contact owns a 2020 Chevrolet Malibu. The contact stated while driving 25 MPH, the odometer and tachometer readings were incorrect. The Services ESC, power steering, power steering assist, and check engine warning light illuminated. The vehicle was turned off and restated and operated normally; however, the check engine warning light remained illuminated. The contact stated that the steering wheel became stiff and the vehicle lost power brakes functionality. The vehicle was taken to an independent mechanic however, the mechanic was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was contacted and stated that the vehicle needed to be diagnosed by an authorized dealer. The failure mileage was 65,000.

- King Of Prussia, PA, USA

The shifter gear control/ shifter assembly keeps failing on and off. It-€™ll give me a warning shift to park. It did this while drive on a major highway then my car loss all power as I was in the second lane causing so much safety concerns. It is also alerting me when I-€™m in park now that I need to shift to park more frequently. Extreme issue.

- Reidsville, NC, USA

The contact owns a 2020 Chevrolet Malibu. The contact stated that while driving at various speeds, the vehicle would intermittently hesitate and stall with the traction control and check engine warning lights illuminated. Once the vehicle stalled, the contact had to wait a few minutes before successfully restarting the vehicle. The vehicle had been taken to the dealer on multiple occasions however, the mechanic was unable to duplicate or determine the cause of the failure. The contact had the pistons, battery terminal, transmission, and wiring harness replaced; however, the failure persisted after each repair. The manufacturer was notified of the failure and referred her to the NHTSA for assistance. The vehicle had yet to be repaired. The failure mileage was unknown.

- New Stanton, PA, USA

I need my pistons and rings replaced. My car only has 57,000 miles. My car has been diagnosed with excessive piston blowby from 2 different independent service centers. Both times I have been to Chevy to get it fixed under warranty, they-€™ve charged me $200 for diagnostics each time and told me it is my PCV valve that needs fixed. I had them fix my PCV valve and I still have excessive piston blowby. Chevy just wants to keep bringing my car back in for more diagnostics. I have spoken with GM customer service 2 times and somehow every single time I give them my VIN they hang up. My car is a 2020 with only 57,000 miles on it. There-€™s absolutely no reason why I should need all new pistons and rings and why Chevy service centers won-€™t just get it done! I have diagnostic reports, receipts, and videos of everything.

- Goshen, IN, USA

1. Something under the car hood is making a whistle type noise. Is available for inspection. 2. I don't know if it is a safety risk. 3. The problem has not been confirmed by the dealer. 4. The vehicle was inspected by the dealership. 5. There were no warning lamps on or anything. The whistling appeared under the hood around May 23,2021. 6. The whistling appears under the hood of the car after driving it approximately 30mins with the air conditioner on. 7. I took it to the dealership and they seem resistant to fix the problem!

- Crown Point , IN, USA

The vehicle will randomly shut off while driving. All warning lights light up on the dash and notification of "reduced steering" pops up. Taken to the dealership and has been there for 19 business days. They will fix a component, I have picked it up twice and it has shut off before I could even get home forcing me to tow it back. This last time they were bringing the car around and it shut off in their own parking lot before they could even give me the keys. Every time they run diagnostics it's a new code. Vehicle is unsafe to drive due to shut-off and loss of steering.

- Summerville, SC, USA