2018 Chevrolet Malibu acceleration problems

Filed Oct 4, 2026 · Acceleration, Steering · NC

My chevy stopped while driving. The engine light came on and engine power reduced. The brakes locked up and I could not go anywhere. Code P1101, Vacuum Pump Failure and ECM came up. Financing this vehicle. Have not been able to drive it in 3 weeks.

Filed Sep 26, 2026 · Acceleration, Brakes · IL

I was driving in town through a stoplight when I noticed my brakes stopped working. Also when I had stopped the car still in drive and the car had shut off completely in the middle of the road and was not able to turn back on. The car would keep trying start but none were successful. My car also stated that there was reduced power to the engine and the car would hesitate to gain speed as well. My safety and others were put to risk because my brakes stopped working so I could’ve caused an accident. When we trying to find what was wrong with it through a code reader we had noticed the piece had shattered inside of the engine. No insurance, police or manufacturer has inspected the issue.

Filed Sep 21, 2026 · Acceleration, Engine · OH

Examatory mark appears on the dashboard say that engine speed as reduced

Filed Jul 30, 2026 · Acceleration, Electrical · IL

A software error in 1.5L turbo model disable fuel injectors, preventing the engine from starting or causing a sudden stall while driving. It’s been confirmed to be an previously opened recall that was fixed by previous owner. But, is happening again to me. Yet I’m being told It has been closed and cannot be fixed unless I pay out of pocket. There are warning signs that pop up like reduced speed while I am driving etc. which reduces my speed and is incredibly unsafe.

Filed Jun 9, 2026 · Acceleration, Electrical · IN

Reduced engine light came on ticking noise stopped 2 times on the highway repair lot ran a diagnostic unable to find the issue car is not working found many codes stillunable to fix the issue

Filed May 5, 2026 · Acceleration, Electrical · RI

The check engine light keeps coming on and off with a warning that the engine power is being reduced. The dealership's service center can't locate the issue. The car's traction warning went off and the car's speed was reduced while driving. This happened twice in the same day. When you shut the car off and turn it back on the warning goes away and the car drives normal. This is very unsafe. Had this happened on the highway there could have been a serious accident.

Filed Apr 10, 2026 · Acceleration · 80,000 miles · MI · crash

The contact owns a 2018 Chevrolet Malibu. The contact stated that while driving very slowly into a parking space, the brake pedal was pressed to stop the vehicle, but the vehicle experienced unintended acceleration and suddenly accelerated forward at a very high rate of speed and crashed into a furniture store showroom window. During the incident, the front end of the vehicle was severely damaged, but no air bags deployed. No injuries were reported. A police report was taken at the scene, and the vehicle was towed to the local dealer. The cause of the failure was not yet determined. The manufacturer was not yet contacted. The failure mileage was 80,000.

Filed Nov 22, 2025 · Acceleration, Brakes · UT

After diagnostic troubleshooting from DTCs on a check engine light, it was discovered that the brake vacuum pump connected to the engine was completely nonfunctional. Previous symptoms included stiff brake, loss of brake power at random brake periods which could have cause and accident with other drivers, and finally malfunctioning sensors attributed to the exhaust system. This also led the vehicle to be unable to pass state regulated Emissions testing because of the inability to maintain proper emissions levels. Brake Vacuum pump that was removed from vehicle to inspect and diagnose is still available for inspection. Recent findings show that Chevrolet/GM is aware of the issue in their vehicles but refuses to address or replace faulty brake vacuum pumps. It is a common problem amongst 2013-2022 Chevrolet Malibus. Vehicle that is in question was inspected by a certified mechanic shop with failed emissions test. Solid check engine light appeared once the brake had become harder to push and stop the car. OBD scans show DTC codes that were pertaining to MAF and MAP malfunctions in readouts and communications to the ECM. After further inspection, the ABS module had been acting as "backup" for hydrolic brakes system that had zero vacuum to power the brake booster, this could have caused the engine to stall, longer than normal stopping distances (stronger risk of rear ending other drivers), and multiple components and sensors to fail, requiring them to also be replaced.

Filed Oct 28, 2025 · Acceleration, Electrical · FL

When putting the car in park it and powering the car off it will say shift to park but car is already in Park. Then it will real stalibark and my wheel will sometimes lock.

Filed Oct 8, 2025 · Acceleration, Electrical · FL

Every so often I get an indication of engine power reduced, but every time I go in to get it checked it's off. I have recently just learned through research online that the issue is caused by a certain condition that gives false reading to the electronics. I have contacted GM and GM financial about the recalls on my cars of the same year. I have not been in a wreck but I have had the issue of engine reduced power in the middle of traffic. Cox Chevrolet in Bradenton has turn me away about the issue GM financial is giving me the runaround neither one mention anything about a recall instead I get a estimate $400 /$808.50/1900.41 all to fix ECM as I told the mechanic I was driving with no problem through the day me and the kids at the park when it was time to leave the car sounded like it just didn't have no gas. We was stuck tell 10:45 we waited two hours for the tow truck. I have OnStar and get monthly reports on my car. When the check engine light comes on OnStar has no indication that's why I believe it is the same ECM. I was told by Chevrolet Maher service manager of St Pete to get my car off their lot as I said before I got a estimate of 400 that went up to 800 and all I did was ask why