2018 Chevrolet Malibu Cruise Control Problems

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.

I was informed the vacuum pump went bad and rendered the vehicle inoperable. The vehicle would lose acceleration, shut off during auto stop and caused me to block traffic. The brakes also locked up, which almost caused me to crash in a residential neighborhood.

car pauses after stopping at lights and stop signs and in stop-n-go traffic and won't go as soon as gas pedal is pressed. It hesitates then jerks forward once the gas is activated. Check engine warning is for stop/start transmission accumulator sensor!

On Jan 22,2024 while driving on the interstate the speed was unexpectedly instantly reduced, the car would not accelerate over 60 MPH and the service engine light came on, the car was safely driven off the highway then towed to the dealership.

Engine power reduced notification came on the dashboard and car deaccelerated down to less than 25 miles an hour on the highway on multiple occasions. On the last occasion about 2 months ago the notification came on again, the car stalled and would not start up again. This was in ongoing traffic and I could have been seriously injured if people behind me were unable to stop in time.

Vehicle won't start and dealership determine it was the battery. Replaced battery now vehicle shuts off completely when making a complete stop. Vehicle will maintain in normal operation if shifted into neutral upon stopping.

My vehicle had the reduced power dash warning and check engine light on while I was driving down the interstate at 65 I lost my power speed reduced to 45 and my stability light came on as well it could have caused a serious accident had it been day time with traffic flying at 70 to 75 MPH rear ending me I was able to get off the freeway safely last night when the incident occurred and safely make it to a parking lot there doesn’t seem to be a current recall on my car with my VIN number at this time but it is a year and model that has known issues also the other issue is vehicle not registering into park even when I put shifter in park possibility is a loose shifter cable

Vehicle slows way down and loss of power. Engine power reduced. On heads up display.

REDUCED ENGINE POWER I have had this issue happen 3 times since owning this car. The last time it happened, my son & I were on the Interstate going 80mph. My 2018 Chevy Malibu quickly slowed to 50mph with no further acceleration.

While driving 70 MPH, I get an Alert that stated reducing speed. And my check engine light came on. This is not the first time.

My engine power reduced signal on my 2018 malibu lt comes on on my dash. I have almost been in a few accidents because of this on the highway. This is an issue that needs to be recalled asap.

Was driving the malibu on the interstate traveling 75 MPH and all of sudden vehicle started to slo dwn and on the dashboard appeared - engine power is reduced. This could have resulted in an accident and not safe as I do travel back and forth to college. I had to make my way over to breakdown lane, turn car off and then turn back on and drive again.

When driving my 2018 chevy malibu it stalls out while I'm driving reducing my speed to 20 MPH when I'am on the freeway. As I continue to drive home I seen a notification that said power reduce system it happens very often and as a result of the stalling I was rear ended from the rear and it is very dangerous for me to continue driving this car.

The car us under 60,000 miles three years old and already breaking down. The air flow sensor out of self-test range, turbocharge engine underboost problems and mass air flow sensor performance is also problematic, making the car stop instantly and sporadically creating a high imminent danger of crashing and serious injuries. Luckily the car behind me was far enough to stop before rear-ending me.

While driving the error message " power reduced" and will only do about 30 MPH. I have looked on line and at least a couple of law firms have clients for the lemon malibu 2018 model. First time this occured, I was going up a hill with a truck behind meand nearly rear ended me.

I was driving at approximately 55mph on a highway when the vehicle gave a warning of 'engine power is reduced'. My car quickly dropped to 20mph and I was unable accelerate. This happened while there was another vehicle behind me and I was scared I was going to be rear ended.

The recall ecm caused engine to stall as I was driving up a hill, I accelerated to make up for the delay and veered into a parked car causing my car to over turn on the hood. I was injured and car rendered totalled. This was my second accident.

Low fuel, engine light, service stability track, shift to park lights come on. The low fuel light comes on first. The next day the engine light comes on sometimes it stays on then goes off.

I just got a 2018 chevy malibu. I was driving home from work today and my car just stopped and a reduce engine power message flashed across my screen. I could have been killed when I car cut off in the middle of a busy street.

I purchase a 2018 chevy malibu in september of 2019 and not even a month after having it, my vehicle began to give me issues. At unannounced times while the vehicle is in motion, a message that reads 'engine power is reduced' displays on the dash and the speed of the vehicle will immediately drop to 20mph.

My car is lagging when I come from a complete stop. It sputters at times when I accelerate. My car is also making a vibration noise when I accelerate, slow down, turning, on highway, city streets and when I'm coasting.

On january 11 2021 while driving my 2018 chevy malibu to work I received a check engine warning on my dash, my message stating "reduced engine power" came on and my car suddenly and significantly reduced speed from 50 to 20mph. I was almost hit from behind by another motorist and had to manuever my car to the side of the road. I turned the car off, reestarted it and was able to continue driving.

I was driving the vehicle and all of a sudden the check engine light came on and the display read engine power reduced. I wasn't sure what that meant so I pulled over. I tried to pull off and I had no brakes.

This issue happened twice in one day...the first time I was going 55 MPH down the road when my car lost all power from the gas petal. I coasted off the road and was able to shift between reverse and then back to drive to get the gas pedal to work again. A couple of hours later that day I was going down the road about 40 MPH when I lost power from the gas petal.

While driving th vehicle the component that ruptured was the vehicles vacuum brake booster pump which connected directly to the engine. The ruptured caused shards of metal to be launched into the engine resulting in no brake power and needs an engine swap.

The contact owns a 2018 Chevrolet Malibu. The contact stated while driving approximately 65 MHP, the message "Engine Power Reduced" was displayed and the vehicle decelerated to 30 MPH. The contact stated that the speed would no longer exceed 30 MPH.

2018 Chevy Malibu over 5 times this happens since we bought it brand new it has "Reduced Engine Power" error come on and the car can't accelerate over 30 miles per hour. This is a continued problem all the time and very dangerous when we are on the tollway that has a 70-MPH speed limit, and you can't get the car to go over 30 MPH.

I got P2138 code, I replaced the accelerator pedal on my cost because the dealer told me my car VIN is not include in the recall, the code keep coming back even after replacing the pedal. The problem it happen two time were I was driving on thruway "65 MPH" the speed suddenly reduced to less than 30 MPH which put me and the other drivers safety in dangerous situation

Suddenly loss of power at cruising speeds. Trouble with acceleration and loss of power. Unresponsiveness from the engine.

Car was driving on major highway when the alarm went off and check engine light came on saying reduced engine power. Car dropped down to 20mph at roughly 2,000rpm's on a major interstate. No prior indicators and mechanic said one of the sensors was the issue.

The contact owns a 2018 Chevrolet Malibu. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power with the traction control and check engine warning lights illuminated. The vehicle was taken to an independent mechanic who diagnosed that the accelerator pedal position assembly needed to be replaced.

Reduced engine power occurs while driving and will indicate a traction control issue and the check engine light will engage. The first time it happened, it was during a snowstorm on 2/24/2022, but it has occurred two other times while driving on a highway on sunny days (3/3/2022 and 3/8/2022) with no snow on the ground, road completely dry. Car speed dropped from approximately 55-60 MPH to 20.

As I was driving down the highway at 60 mph the road was clear at the time of any debris my car suddenly had two lights on the dashboard. On the left was the traction control light and the right side was the engine light. On my computer display was the words “reduced engine speed”. My car suddenly slowed from 60 to about 30 mph in a matter of seconds. It was like I had slammed my brakes. This all happened simultaneously I attempted to pull over safety and turn the car off and restart it. The lights remained on. My car was not able to get over 27 mph There was no warning what so ever If anyone would have been behind me I would have been rear ended At this time I took it to a mechanic who put it on the computer it was coded at the pedal position sensor. He was able to save the code, clear it so I was able to drive the car and advised to drive it locally for a while in case it would do it again as it is unsafe. The closest Chevy dealer is over an hour away from my town and at the time of day it was not safe to drive the car to the dealership for confirmation.

Vehicle continually throws reduced engine power code which includes while traveling at high speeds and winter weather. Vehicle resets once powered off to throw a code sometimes again immediately or within a short period of time rendering the vehicle virtually unusable. Difficult to get to a safe spot to turn vehicle off to attempt to re-set. This puts occupants in danger of being rear ended, stuck in snow/mud or hit from behind while pulled over trying to reset vehicle. This has been an ongoing problem since purchasing the car new. Was fixed under warrant once. Fix didn’t last long and have continuously had issues

My 2018 Chevy Malibu has been working fine then all of a sudden the warning light came on and the message warning light read ENGINE POWER REDUCED While I was driving on the freeway at 60 mph dropping my speed to 25mph instincts told me to pull over, so I did! Then I tried to drive again still no power it was like a strong pullback! So I again pulled over and turned my car engine off! Let it sit a few hours before driving up to local automotive parts store to use the ODII code reader and it read the code P2138 Throttle/ Pedal Position Sensor Correlation The part to order is $120.00 I am not able to get it today so I googythe problem and found out that this is a possible RECALL ??!!??

I was driving on a crowded city street in St. Louis and my car suddenly reduced power and I saw a message on my dash that said Engine Power Reduced! I could not go faster than 15 miles an hour and had to pull into a gas station. I restarted my car and still had the message. I restarted again and the check engine light was still on, but I was able to drive at a normal speed. My concern is that I was a short distance from getting on a busy interstate highway and it could have happened while I was on the highway and could have been struck by a car.

I have owned this vehicle for 3 months now, since week two "ENGINE POWER REDUCED" HAS BEEN A BIG PROBLEM FOR ME I TOOK IT IN TO MISSION BAY CHEVY IN SAN DIEGO THE PROBLEM WENT FROM EVERY ONCE IN AWHILE TO NON STOP. I WAS UABLE TO GET AN ANSWER FROM THEM IN WEEKS. FINALLY I WENT BACK TO THE INDEPENDENT DEALERSHIP I PURCHASED THE VEHICLE FROM 4X TO FIX THIS PROBLEM. AND IT KEEPS COMMING BACK AFTER DAYS. IM PAYING $500 MONTHLY FOR THIS CAR AND IM RUNNIN GOUT OF OPTIONS THIS IS CAUSING MY VEHICLE TO REDUCE POWER ON THE FREE WAY AT SPEED OF 23MPH TO 35MPH. THERE WAS ALREADY A CLASSACTION LAW SUITE FOR THIS PROBLEM. AND I CAN NOT AFFORD TO KEEP GETTING IT FIXED ITS CLEARLY A DEFECT THAT KEEPS COMING BACK, I HAVE READ SEVERAL CONSUMER REPORTS WITH THE SAME ISSUE. I NEED A FUNCTIONING CAR AND I DONT KNOW WHERE ELSE TO TURN

After pulling out of a convenient store, onto a main road for about a half a mile my car immediately lost speed and a display appeared in my dash engine power reduced , check engine light and traction control light appeared. I couldn't drive no more than 20 miles per hour .. Scary moment, so glad nothing was coming behind me.

While driving 65 MPH car issued warning reduced engine power and check engine light popped on. Car then would not drive faster than 30 MPH. Very sudden and with no previous warning this happened.

I was driving at highway speed when suddenly car decelerated to 20mph. The check engine light warning popped up along with a engine power reduced message. I was unable to accelerate at normal highway speeds even after turning off and restarting car.

Check engine light came on and my speed was instantly reduced as I was driving. Sometimes it goes off after turning off the ignition but I could be on the highway or city streets and it will occur, causing a sudden slower speed.

I was driving on a highway going about 50 MPH and I started to accelerate and as I hit 55 MPH I got an error message reading, 'engine power reduced' and the ABS light and engine light both lit up. I also could not accelerate any longer.

So many issues, car currently not starting. Codes were for brake booster and maf sensors, replaced both. Still won't start.

We were driving on the freeway and the reduced power light, engine light and traction control light came on. The power was reduced and we pulled over, shut the car off and waited a few minutes. We started it again and the check engine light stays on, but we were able to gain speed to get back in traffic.

After 2 months of having this car the check engine light would come on and after the stabilitrak light would come on which reduced the speed of the car . This would come on when I'm driving or even if I just crank the car up from it sitting over night . I got it tested and the shop doesn't know why it keeps coming on .

While driving, vehicle with randomly display error code saying 'engine power reduced'. When this happens, the car's speed reduces to ~25 MPH and it's incredibly hard to accelerate past that. This reduced engine power warning comes on frequently, and without warning.

We had the ecm system recal fixed (reprogrammed) and it was ok, but now a couple months later its doing it again. While driving the traction light and the engine light come on and power and speed is reduced, without warning and won't allow acceleration. Usually on the highway.

While driving down the street I got an alert on the dash indicating 'engine power reduced' check engine light and what I believe is the traction control light came on. can't accelerate. can't go more than 30 MPH.

My car reduced its engine power and slowed down from 60 miles down to 20 miles while driving on the high way with a tank truck behind me. I have never been so scared in my life. The engine reduced its power three times now!

While driving check engine light comes on and control panel says engine power reduced. The car slows down and you are not able to accelerate.this has happened numerous times since I have bought the car and typically happens while accelerating.

Faulty accelerator position sensor. Part is suppose to last the life of the car. The car has 60000 miles on it.

Tl* the contact owns a 2018 chevrolet malibu. While driving approximately 45-50 MPH, the accelerator pedal was depressed, but the vehicle hesitated. Additionally, the vehicle vibrated abnormally while driving on several occasions.

I was driving in the city, heavy traffic, when with no warning the engine light and traction light came on, and message reduction in power also came on. I could not move faster than 20 miles an hour. I obstructed traffic trying to get off the street, and drivers honked and yelled trying to avoid hitting me.

Tl* the contact owns a 2018 chevrolet malibu. While attempting to merge onto the highway, the accelerator pedal was depressed, but the vehicle failed to accelerate. After a few minutes, the vehicle accelerated.

My vehicle often doesn't not accelerate as it should. RPM will read between 3 and 4 RPM speed will not go above 5 to 10 MPH. This is a random occurrence but has became more frequent in the last two weeks.

Car was not accelerating would not go past 20mphtook to dealer ship took 2 months to figure out it was the knock sensor and also the ecm were out mind you my car had less than 6k miles I'm the first and only owner of it! I bought this car from don ringler with 4 miles. My car was on the high way when this happen.

While I was driving, the entire accelerator pedal mechanism fell to the ground. My mechanic told me it is because the accelerator pedal mechanism is a bad design, including too small of a bolt, and I had to have it reattached to the car. The accelerator pedal functioned, but it was incredibly dangerous because it was on the floor and couldn't be practically used.

The car continuously is throwing a code P2138 and a warning comes up on dash saying reduced engine power. This happened 6 times to me yesterday wherein I was traveling on 1 lane winding roads in my neighborhood so the speed drops from wherever it is down to 10mph instantly. On 1 lane roads in the area where I reside there’s no safe place to pull over.

I keep getting a reoccurring message saying Engine Speed reduced, I can be driving going 60+MPH and randomly My car speed is reduced. This is becoming a safety issue as I have noticed this is a ongoing issue wit the 2016-2018 Chevy Malibu's.

As I was driving I was addressed with a speed reduction warning and it followed with a very abrupt problem with speed as it was reduced drastically and almost getting rear-ended in the process I was able to pull over but very unsafely and without warning

While driving engine power reduced message comes on and speed is cut to below 35 MPH.

While driving my engine and traction light came on and a sensor popped up that read 'engine power is reduced'. I was driving down the highway and my speed was reduced. I can't and could not speed up.

When I drive I'm losing engine power where my speed is reduced significantly. This is very dangerous. I've looked up this issue and there is a recall on malibu's 2016-2018.

On the freeway going about 70mph.engine power reduced light came on. My speed dropped to 20mph. Very scary especially with a child in the car.

At a stop light, when light turned green, pressed accelerator, "engine power is reduced" messaged flashed, engine and traction lights came on. Unable to accelerate over 25mph, RPM would not go above 3. Recall maintenance for ecm was completed on 01/11/2020.

While in motion cars reduced engine power lights up on dashboard and car looses power while driving

I was driving down the highway at 75 MPH, when an error message came up saying 'reduced engine power' and something about traction control. Then my speed was reduced and I could not accelerate. I had to quickly pull off to the shoulder so I would avoid being hit by oncoming 18 wheelers.