2018 Chevrolet Malibu: check engine light

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 2, 2026 · Engine, Transmission · 180,000 miles · GA

The contact owns a 2018 Chevrolet Malibu. The contact stated that while the vehicle was parked, the message "Shift to Park" was displayed on the instrument panel. The gear shifter was shifted back into drive and then back into park to turn off the vehicle. The contact also stated that while driving approximately 65 MPH, the vehicle shuddered, started to lose automotive power, and then continued driving; however, the vehicle operated at reduced power and failed to exceed 30 MPH. The check engine warning light was illuminated. The vehicle was restarted; however, the failure persisted. The contact stated that there was an unknown liquid dripping underneath the vehicle. The manufacturer was notified of the failure. The failure mileage was approximately 180,000.

Filed Jun 9, 2026 · Brakes, Engine · 150,000 miles · FL

The contact owns a 2018 Chevrolet Malibu. The contact stated that while driving on the interstate and attempting to exit the ramp at 40-45 MPH, the brakes failed. After restarting the vehicle, the check engine warning light illuminated. The contact related the failure to the federal safety agency Campaign Number: 18V576000 (Service Brakes, Hydraulic). The vehicle was towed to the local dealer, where it was diagnosed that the vacuum pump had failed. The vehicle was not repaired. The manufacturer was contacted, confirmed there was no recall and referred the contact to the federal safety agency Hotline. The approximate failure mileage was 150,000.

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 10, 2026 · Engine · WA

The vacuum break booster went out. My check engine light came on and it said power reduced I’m not sure exactly. Because my power didn’t reduce but my car seems to be misfiring. Luckily I was going to be turning at a light and there was a few cars in front of me so I wasn’t going fast. As I got closer to the car in front of me I applied my breaks. They would not move and were hard and I gave it all I had to try to get my car to stop and thank god it did. Then my car stalled. I tried to start it and it just kept cranking but wouldn’t turn over, it also would not turn off till about the 3 times I push then button it finally turned off. Yes my safety and others would surely been at risk I wouldn’t have been able to stop in time if someone pulled in front of me or stopped suddenly I would not have been able to stop. If a child ran into the street I inn o way could’ve stopped! My step dad is a mechanic and he also ran a test on the check engine light and it threw 7 codes from this occurring. It didn’t give me no time it was very sudden. Once the engine power reduced appeared on my dash the check engine light came on and my car began misfiring in less then 45 seconds I went to apply the breaks and they were hard and I could barely stop. That was when I was almost about to be at a full stop so I wasn’t going very fast at all and I almost rear ended the person in front of me waiting to turn at the light. Then my car stalled. It all happened within 1 min 30 seconds from the warning my engine power was reduced but my engine power wasn’t not reduced either, and from then my check engine light and it all only took less then 2 minutes to all occur. It was sudden, no warning to think my breaks would not work at all and very quickly it could’ve been so much worse I can’t even imagine. Very alarming and fearful or my life and others from this occurring with no time to react and no idea what happened was going to. I will not buy a Chevy Malibu again and I was going to!

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 22, 2026 · Engine, Transmission · 116,000 miles · OH

The contact owns a 2018 Chevrolet Malibu. The contact stated that on several occasions while driving at various speeds, the message "Engine Power Reduced" was displayed, and the check engine warning light was illuminated. The contact stated that after 20 minutes of consecutive driving, the vehicle drove sluggishly and lost power. The vehicle was taken to an independent mechanic, where the check engine warning light was reset, but the diagnostic result was not provided. The vehicle was then taken to another independent mechanic where a diagnostic test could not be performed because the machine was unable to remain connected to the ECM. The vehicle was then taken to a dealer, but was not diagnosed. The contact stated that an unknown software update was performed; however, the failure persisted. The vehicle was taken to the same dealer where it was diagnosed and determined that three fuel injectors were weak, there was a crack in the lower oil pan, and that the oil pan needed to be replaced. The vehicle was partially repaired by replacing the oil pan, but the fuel injectors were not replaced. The contact stated that on several occasions during the summer, after turning the vehicle off, the message "Shift to Park" was displayed. The vehicle was turned on and the shifter was shifted several times and was turned off several times until the correct gear selection was recognized. The manufacturer was not notified of the failure. The failure mileage was approximately 116,000.

Filed Apr 20, 2026 · Driver assistance, Fuel system · 130,000 miles · GA

The contact owns a 2018 Chevrolet Malibu. The contact stated that while driving at an undisclosed speed, a fuel odor was detected, and the vehicle failed to accelerate above 30 MPH. The check engine warning light was illuminated. Additionally, the rearview camera intermittently failed to display while reversing, and the vehicle made an abnormal clicking sound. Upon inspection, the contact discovered a fuel leak beneath the engine. The vehicle was towed to the residence, where an independent mechanic determined that the fuel line needed to be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure and advised the contact to file a complaint with the federal safety agency Hotline. The failure mileage was approximately 130,000.

Filed Mar 3, 2026 · Engine, Transmission · 123,334 miles · CA

The contact owns a 2018 Chevrolet Malibu. The contact stated that there was a failure near the fuse box. Additionally, there was a grinding sound coming from the vehicle while the brake pedal was depressed. There were no warning lights illuminated. The contact stated that the engine warning light was illuminated prior to the failure. The ECM and PCM were diagnosed, and DTC: P0689 was retrieved. The vehicle was undrivable. An appointment was scheduled; however, the vehicle was not yet diagnosed or repaired due to the cost of the diagnostic test. The vehicle was inspected by an independent mechanic who checked the spark plugs, cylinders, and fuses; however, the vehicle still failed to start. The vehicle was not repaired. The manufacturer was contacted and notified of the failure; however, the contact was placed on hold. The contact disconnected the call because no one returned to the call. The failure mileage was 123,334.

Filed Feb 3, 2026 · Brakes, Engine · NY

The Vacuum pump continues to go out causes code P1101. I have replaced it 4 times and people just in my town are fighting this code for dear life like me! It causes our brakes to barely work and make it completely unsafe to drive as the check engine light goes in and out for MAF sensor. It’s not safe. It needs to be recalled. It doesn’t matter if i buy the most cheapest part or expensive part. It has happened on multiple occasions where i replace it and within 2 months, its back on and does reduced power in the middle of me driving on busy roads. i’ve been almost hit and almost caused multiple accidents because I have to pull over.

Filed Jan 6, 2026 · Brakes, Engine · 111,000 miles · AZ

The contact owns a 2018 Chevrolet Malibu. The contact stated that while coming to a stop, the brake pedal suddenly became inoperable. There was no warning light illuminated. The contact stated that excessive force was required to depress the brake pedal. The contact stated that the brake pedal went to the floorboard while stopping the vehicle. The contact then stated that after pulling into a parking lot, the contact attempted to restart the vehicle; however, the vehicle failed to start with the check engine warning light illuminated. The vehicle was taken to an independent mechanic, but was not diagnosed or repaired. The dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 111,000.

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.