2017 Chevrolet Malibu VEHICLE SPEED CONTROL,ENGINE

While driving at highway speeds, my vehicle suddenly experienced a loss of engine power and reduced acceleration. The traction control light and engine light illuminated, and a “Reduced Engine Power” message appeared. The vehicle would not respond to the accelerator, creating a serious safety hazard. This occurred shortly after authorized dealer service involving the PCV system and related components. The vehicle did not have this issue prior to dealer service. I returned the vehicle to the dealer, and they stated they could not replicate the issue. The sudden loss of power could have resulted in a serious accident. I believe this may be related to improper dealer service, disturbed electrical connectors, or throttle body/engine management components. I am reporting this as a safety concern. I also would like to mention this safety issue has occurred now multiple times with my car on multiple separate occasions with the last prior occurrence being 12/20/2025.

The contact owns a 2017 Chevrolet Malibu. The contact stated that the accelerator pedal lost connection while driving 65 MPH. The contact stated that the vehicle lost motive power while driving. There were no warning lights illuminated. The vehicle was taken to the local dealer, where it was diagnosed and determined that the accelerator pedal sensor was not connecting with the accelerator pedal. The vehicle was repaired. The manufacturer was contacted, and opened a case, but no additional assistance was provided. The failure mileage was approximately 185,000.

I was in the freeway and out of nowhere an alert message popped up on the dashboard saying Engine power reduced. This made my car go from 65mph to 30 mph is the freeway luckily I was able to exit and go to the nearest gas station and was able to keep myself safe as others on the road but it could've easily gone very badly. The car won't go over 30 mph. The car is available for inspection upon request, I seen a PDF in the nhtsa website of a special coverage adjustment for loss of continuity within acceleration pedal position circuit. I will attach it to this message.

My car has reduce engine speed. I’m driving on the highway and out of nowhere the car shots down and a symbol appears on my dashboard that says Reduce Engine Speed. Literally the car slows down to a minimal speed until I can’t drive anymore. I have to stop and turn off the car for 5 minutes until I can turn it on and drive to my destination in a reduce speed.

The contact owns a 2017 Chevrolet Malibu. The contact stated that while driving approximately 60 MPH, the “Engine Power Reduced” warning light illuminated and the vehicle inadvertently decelerated. The contact was able to pull over safely. The contact called the local dealer and was provided an estimate for the diagnostic fee; however, the vehicle was not diagnosed nor repaired. The manufacturer was not contacted or informed of the failure. The failure mileage was approximately 64,000.

Complete loss of engine power while going 65mph on highway. Warning light of low power first followed by check engine light then power reduced to 5mph. I turn the car off then restarted after 15 minutes, the morning light was off but the check engine light remained on. I then went to AutoZone to have a diagnostic test done which resulted In error code P2138. P2138 is for throttle/pedal position. My vehicle should still be under warranty however due to short staffing I am unable to make an appointment to have it looked at for at least six weeks

Transmission and engine alert

While merging into traffic my 2017 Malibu's power reduced (reduced power indicator appeared) which resulted in my inability to control the speed/acceleration. I've had two additional incidents. Very unsafe deficiency.

I was driving at 60 mph the check engine light came on the engine power reduced message appeared on the screen my speed dropped to 20 mph and loss acceleration I abs to pull over to the side of the road

The contact owns a 2017 Chevrolet Malibu. The contact stated that while driving 65 MPH, the vehicle inadvertently decelerated to 35 MPH. The contact was able to pull over safely. The check engine warning light was illuminated. Additionally, the “Reduced Power” message was displayed. The contact called the local dealer but, the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The approximate failure mileage was 112,693.

I WAS DRIVING ON THE STREET WHEN MY ENGINE POWER IS REDUCED NOTIFICATION CAME UP ON MY DASH BOARD. MY ENGINE LIGHT ALSO CAME ON. I WAS DRIVING ABOUT 45MPH WHEN THE LIGHT CAME ON AND IT REDUCED MY SPEED TO 20MPH. I WAS ABLE TO DRIVE IT HOME AT THE 20MPH SPEED. I PARKED IT OVERNIGHT AND CHECKED ON IT THE NEXT MORNING. WHEN STARTING MY CAR THE NEXT DAY THE ENGINE POWER IS REDUCED LIGHT WAS STILL ON. I WAS LOOKING ONLINE AND OTHERS ARE HAVING THE SAME ISSUE. WHAT IS GOING ON. I NEED HELP

Car accelerates on its own while I’m driving. In addition , without warning the car engines suddenly reduced speed. This has accrued while I’m on the freeway without any warnings.

WHEN DRIVING MY CAR, IT SUDDENLY STOPS IN THE MIDDLE OF THE FREEWAY AND DISPLAYS A 'LOSS ENGINE POWER CODE'. I NOTICED THAT QUITE A BIT OF OTHER MALIBU OWNERS HAVE BEEN HAVING THIS SAME ISSUE

AS WE WERE GOING 75MPH DOWN THE HIGHWAY THE VEHICLE STARTED DEACCELERATING WITH THE CHECK ENGINE LIGHT WITH THE FOLLOWING MESSAGE APPEARING ON THE SCREEN 'ENGINE POWER REDUCED' WE HAD TO QUICKLY PULL OVER TO THE SIDE OF THE ROAD TO AVOID HAVING A WRECK. AFTER SHUTTING THE CAR OFF FOR A LITTLE BIT THE MESSAGE DISAPPEARED. AFTER LOOKING INTO THIS THERE A MULTIPLE PEOPLE WITH THE SAME CAR AND SAME ISSUES, BUT NO RECALL OR INVESTIGATION HAS BEEN STARTED.

I PURCHASED THIS VEHICLE FOR MY SON IN JANUARY 2017. 3/27/2021, HE WAS DRIVING IT AND LOST POWER ON THE INTERSTATE. THE VEHICLE WOULD NOT GO OVER 25 MILES AN HOUR. HE HAD TO STOP ON THE SIDE OF THE ROAD AND LET IT SIT FOR A WHILE THEN RESTART IT. IT HAPPENED 4 ADDITIONAL TIMES WITHIN 30 MINUTES.

CAR WENT INTO LOW POWER MODE AND WOULDN'T DRIVE OVER THE SPEED OF 15-20 MILES AN HOUR.

THE REDUCED ENGINE POWER LIGHT IS CONTINUING TO APPEAR. I TOOK IT TO MY GM DEALER AND THEY TOLD ME THEY CAN'T FIX IT. THIS IS A SAFETY CONCERN. DROPPING FROM 60 MPH TO 30 MPH ON THE FREEWAY/HIGHWAY IS NOT SAFE.

REDUCED SPEED ENGINE PROBLEM WILL REDUCE SPEED WHILE DRIVING

I OWN A 2017 CHEVY MALIBU LT. I WAS DRIVING AT AROUND 60 MPH ON THE HIGHWAY, WHEN SUDDENLY I RECEIVED A MESSAGE ON THE DASHBOARD STATING, 'ENGINE POWER IS REDUCED'. I WAS IN THE MIDDLE LANE AND I HAD TO FRANTICALLY FIND A WAY TO PULL OVER TO THE RIGHT WHILE THE VEHICLE STARTED SLOWING DOWN TO JUST ABOUT 20 MPH. FORTUNATELY, I WAS ABLE TO SAFELY PULL OVER. THIS IS A VERY DANGEROUS SITUATION. I RESEARCHED ONLINE, AND FOUND OUT THAT THIS EXACT THING HAS HAPPENED TO MANY PEOPLE WHO ALSO OWN A CHEVY MALIBU 2016-2018. GM NEEDS TO SERIOUSLY CONSIDER MAKING THIS A RECALL.

WHILE DRIVING THE CAR DOWN THE ROAD A MESSAGE DISPLAYED SAYING "ENGINE POWER IS REDUCED" AND I COULD NOT DRIVE THE CAR OVER 20 MILES PER HOUR. THIS THANKFULLY OCCURRED WHILE I WAS DRIVING THROUGH A RESIDENTIAL NEIGHBORHOOD SO I WAS ABLE TO SAFELY PARK MY CAR. THROUGH RESEARCH THERE IS A KNOWN DEFECT WITH A FAULTY ACCELERATOR SENSOR THAT CAUSES THIS. IT IS THE FIRST TIME THIS HAS HAPPENED SINCE GETTING THE VEHICLE BRAND NEW IN 2017. THIS IS SCARY BECAUSE IT WAS INSTANT AND I COULD HAVE BEEN ON THE FREEWAY WHEN THIS OCCURRED.

WHEN DRIVING DOWN A HIGHWAY TO DROP OFF KID AT SCHOOL, THE CAR SOMETIMES SLOWS DOWN ON ITS OWN AND A MESSAGE COMES ON STATING ENGINE POWER REDUCED. AT 6:30 AM IN THE MORNING WHEN IT'S STILL DARK, THIS IS GOING TO CAUSE A CAR CRASH SOONER OR LATER. BUT DEALER SAYS THERE IS NO RECALL.

CRUISING TO WORK ON I-93 IN CONCORD, NH TRAVELING AROUND 70 MPH AND IT JUST LOST POWER AGAIN!!! THE "REDUCE ENGINE POWER LIGHT" CAME ON AND VEHICLE WOULD ONLY GO 25-30 MPH. THANKFULLY THERE WASN'T A VEHICLE BEHIND ME. I WOULD HAVE BEEN "KILLED". DROPPED VEHICLE TO CHEVY DEALER. THEY FOUND P2127 FOR ACCELERATOR PEDAL POSITION SENSOR FAILURE, REPLACED GAS PEDAL, CLEARED CODES, ROAD TESTES. MILEAGE 76,473. THIS IS ABSOLUTELY AND TOTALLY UNSAFE AND UNACCEPTABLE. THE VEHICLE IS IN THE SHOP AGAIN FOR THE FOURTH TIME, SAME ISSUE. I WILL REPORT EACH INCIDENT SEPARATELY. *TR

DROVE 30 MILES SINCE THE LAST TIME IT WAS IN THE SHOP FOR THIS ISSUE. STARTED MY VEHICLE IN THE DRIVEWAY AND THE "REDUCED ENGINE POWER LIGHT" CAME ON. SO FRUSTRATING AND A WASTE OF TIME!! I IMMEDIATELY DROVE BACK TO DEALERSHIP FOR REPAIR. A BUNCH OF CODES CAME UP. THEY REMOVED AND REPLACED THE ECM. ROAD TESTED FOR 45 MILES BEFORE RETURNING VEHICLE. *TR

ENTERED ON-RAMP TO HEAD SOUTH ON I-93 AND HALF-WAY UP THE RAMP IT HAPPENED AGAIN. THE "REDUCE ENGINE POWER LIGHT" CAME ON AND THE SPEED DROPPED IMMEDIATELY. I COULDN'T TURN AROUND AND GO HOME, SO I CONTINUED DOWN THE INTERSTATE GOING IN AND OUT OF THE BREAKDOWN LANE TO AVOID UPCOMING TRAFFIC BEHIND ME. IMMEDIATELY DROVE TO DEALERSHIP AND DROPPED OFF VEHICLE. I HAVE BEEN WORKING FROM HOME SINCE MARCH 15, 2020, SO I PROBABLY PUT APPROXIMATELY 200 MILES ON THE VEHICLE SINCE THE ECM WAS REPLACED. THERE IS NO RHYME OR REASON THAT THIS CONTINUES TO HAPPEN. HOWEVER, THIS IS ABSOLUTELY AND TOTALLY UNSAFE AND UNACCEPTABLE!!! I'M THINKING PEOPLE HAVE DIED BECAUSE OF THIS ISSUE - IT IS SO UNSAFE!!!! I AM WAITING TO HEAR BACK FROM THE DEALERSHIP.

I WAS DRIVING ON THE HIGHWAY TODAY GOING AROUND 70 MPH AND MY CAR DISPLAYED "REDUCED ENGINE POWER" AND IMMEDIATELY LOST POWER AND DECELERATED. IT IS NOT THE FIRST TIME THAT IT HAS DONE THIS BUT IT WAS THE FIRST TIME DRIVING AT THAT HIGH RATE OF SPEED. THE OTHER TIMES IT HAS HAPPENED ON CITY STREETS WHEN I WAS GOING MORE THAN MAYBE 40 MPH. EACH TIME IF I TURN THE CAR OFF AND THEN WAIT A FEW SECONDS AND START IT AGAIN, THE REDUCED ENGINE POWER DISPLAY IS GONE AND I DONT HAVE ANYMORE IMMEDIATE ISSUES WITH IT, SOMETIMES FOR DAYS OR WEEKS AT A TIME. I HAVE NOTICED ONLINE THAT SEVERAL PEOPLE HAVE EXPERIENCED SOMETHING SIMILAR WITH THEIR 2017 CHEVROLET MALIBU.