2018 Buick Encore Engine Problems

Not long after I purchased my car, i noticed it was lacking power during takeoff and when driving uphill which forced my car to hit very high RPMs during normal use. There was also a P0299 code that appeared then disappeared frequently. I discovered a turbo special coverage N232395330 and took it to Williams GMC in Charlotte. After i told them very clearly what happened MULTIPLE times, confirming the underboost and the code, I even brought it in with the code, they told me the code wasnt "active" and that there no problems...even after i told them I didnt feel safe and couldnt pull out at intersections with fear of being rear-ended. I had videos, they refused to look at and told me to come back when the code was permanent. I drove the vehicle for the next year, 20k miles in order to get the code permanent, after a trip home, through the mountains, really tough without the turbo, my car was consistently pinging 4-5000 RPM under the speed limit on inclines...this happened every time I drove through, but this time the code was active the entire time. 2-3000 miles with the code, finally it was permanent. I brought the car back to Williams GMC, to get the turbo changed. I updated them on recent occurrences, flashing check engine light, the code active for 2-3k miles, and they performed a road test, and declared it wasn't a problem. I told them i recently spent 5k on repairing my cooling and AC system because the turbo, they said that wouldn't affect those components, meanwhile i know they have plastic parts that can melt and the engine being forced to push 4-5k RPM the extra heat could easily melt those parts. They said, nothing was wrong and the road test was good. sent me on my way. I called corporate, they told me to get a second opinion. I did [XXX] found the problem and changed the turbo per the special coverage N232395330. a week later, my engine overheated, i pulled over and it wouldnt start, engin won't hold compression. Car is tot now. Long story shrt INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORM

NHTSA ID

11754320

Incident

Jun 22, 2026

General Motors issued a Special Policy N202299080 covering 2014 Buick Encores. My 2018 Encore had the same issues and symptoms as this Policy. My concern is because of this known problem the crankcase can be pressurized causing oil leaks which could cause a fire. General Motors issued a Service Information Bulletin 19-NA-114 in May 2019 about involving 2013 to 2019 Buick Encores. This is a known issue for many models other than my vehicle. I have the old parts from the repair for inspection which includes the Intake Manifold and the Valve Cover for faulty PCV components that cause the engine to produce excess Engine Crankcase pressure possibly causing a fire. My vehicle had a check engine light code of P0171 and the odor of burning oil.

NHTSA ID

11754080

Incident

Jun 1, 2026

Request for Goodwill Assistance – Turbocharger Failure (Special Coverage XXX) Dear General Motors Customer Assistance, I am writing to request a one-time goodwill repair for my 2018 Buick Encore (VIN: [XXX]). Approximately two months after purchasing this vehicle, the check engine light illuminated and diagnostic testing identified code P0299, indicating turbocharger failure. This issue appears to align with General Motors' Special Coverage Program XXX, issued in February 2024 for certain 2017–2018 Buick Encore vehicles equipped with the 1.4L engine due to known turbocharger failures. Unfortunately, my local GM dealership has informed me that they are unable to perform the repair under the special coverage because the vehicle carries a Pennsylvania reconstructed (R) title. While I understand the vehicle's title status, I respectfully ask GM to consider the unique circumstances. In Pennsylvania, reconstructed vehicles must undergo a rigorous Enhanced Vehicle Inspection process before they can be legally registered and operated on public roads. My vehicle successfully passed all required inspections and is legally certified for highway use. Because this special coverage was issued to address a defect that may lead to significant engine damage and, in some cases, a potential engine compartment fire, I am requesting a one-time goodwill repair or other assistance from General Motors. The concern involves a known condition affecting this vehicle platform and presents a potential safety risk during both local and highway driving. I have been a loyal GM customer and would greatly appreciate your review of this situation. Given that the vehicle has been properly repaired, inspected, and approved for road use under Pennsylvania law, I respectfully request that GM reconsider eligibility for assistance despite the reconstructed title designation. Thank you for your time, consideration, and any assistance you may be able to provide. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B

NHTSA ID

11743163

Incident

Jun 8, 2026

Was driving and lost complete power but came right back on itself. Car also makes a loud noise periodically when reversing and pressing the brake. Was told this was engine timing chain. Cooling fan periodically stays on draining the battery after car is turned off. None of these issues have been correct but told there is no recall to fix these issues.

NHTSA ID

11712726

Incident

Sep 4, 2025

After filling up fuel vehicle starts and stalls out. This occurs while driving at stop signs. And also while driving loss of power. There is something wrong in the engine, timing belt, fuel, etc.

NHTSA ID

11708285

Incident

Dec 24, 2025

Brought my car to get an oil change and was told they could not do it as my oil filter housing unit is cracked and leaking oil they said to check for recalls as this is an issue with other vehicle same problem. Upon checking i was informed that Buick is not making this a recall item at this time. They put in enough oil for me to get home.

NHTSA ID

11699432

Incident

Nov 14, 2025

COMPONENT FAILURE: THE ENGINE TIMING CHAIN. YES, IT IS AVAILABLE FOR INSPECTION. SAFETY RISK: VEHICLE HESITATED AND LOST POWER IN TRAFFIC, CAUSING MY VEHICLE TO AUTOMATICALLY SLOW DOWN WHERE I WAS NO LONGER DRIVING AT THE SPEED LIMIT. MY SAFETY AND OTHER DRIVERS AROUND ME WAS COMPROMISED AS THIS COULD HAVE CAUSED A MAJOR ACCIDENT SHOULD I HAVE BEEN REAR ENDED. I HAD IT TOWED TO LAMBERT BUICK, CUYAHOGA FALLS, OHIO. THEY DIAGNOSED A TIMING CHAIN MALFUNCTION WHICH WAS CONFIRMED BY DEALERSHIP DIAGNOSTIC TESTING. I WAS ADVISED NOT TO DRIVE VEHICLE DUE TO ENGINE DAMAGE POTENTIAL. I HAD IT TOWED BACK TO MY HOME AND HAVE NOT DRIVEN IT SINCE. VEHICLE HAS NOT BEEN INSPECTED BY THE MANUFACTURER, POLICE, INSURANCE OR ANYONE ELSE. THERE WAS NO WARNING, MESSAGES OR ANY SYMPTOMS PRIOR TO THE ENGINE TIMING CHAIN ISSUE. A WARNING LIGHT ONLY CAME ON WHEN THE CAR HESITATED AND LOST POWER IN TRAFFIC.

NHTSA ID

11698683

Incident

Sep 26, 2025

The contact owns a 2018 Buick Encore. The contact stated that while driving at an undisclosed speed, the vehicle inadvertently lost motive power. The contact was able to coast to the shoulder of the roadway, where the vehicle failed to restart. The check engine warning light was illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the timing chain, resulting in damage to the crankshaft. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was 98,507.

NHTSA ID

11698656

Incident

Nov 10, 2025

Mileage

98,507 mi

Engine stalls, intake hose, power issues, multiple oil leaks

NHTSA ID

11681643

Incident

Feb 10, 2025

The contact owns a 2018 Buick Encore. The contact stated while driving at undisclosed speeds, the vehicle was shaking abnormally with the check engine and stabili-trak warning lights illuminated. The contact pulled over to the side of the road and turned off and restarted the vehicle and the warning lights were cleared, and the vehicle drove normally. The contact stated that the failure was intermittent but was a recurring failure. The contact had taken the vehicle to an independent mechanic who diagnosed the vehicle and replaced the ignition coils and spark plugs; however, the failure reoccurred. The manufacturer was informed of the failure and referred the contact to the NHTSA Hotline. The failure mileage was approximately 109,800.

NHTSA ID

11663984

Incident

Jun 7, 2024

Mileage

109,800 mi

During normal driving the car would lose power. RPM's would drop and with engine sputtering. No trouble codes show up.

NHTSA ID

11642953

Incident

Feb 15, 2025

I have been alerted by General Motors, via a letter that I received in March, 2024, that, due to a defect, my car's (a 2018 model year Buick Encore) engine may have a "condition where the turbocharger could fail" and that "the engine may run rough or have reduced power." In the letter, they have offered "additional protection for the condition" if the "condition occurs...within 10 years of the date your car was originally placed in service or 120,000 miles...whichever occurs first." On [XXX], my car was at 126,819 miles, and had all of the symptoms of the issue that were described in the March 2024 letter ("the Malfunction Indicator Light (Check Engine Light) will illuminate and a diagnostic trouble code will set. Additionally, the engine may run rough or have reduced power.") On May 3, 2024, I contacted GM at the phone number provided in the March 2024 letter ((800) 521-7300.) I was told by the GM representative that, because I was "over the mileage", that any GM dealer would have to charge me a $130.00 Diagnostic Fee to diagnose the issue, and, that even after diagnosing, there was no guarantee that GM would fix the issue, because I was "over the mileage". The GM representative also said I could ask the dealer to waive the Diagnostic Fee, at the dealer's discretion. If, after paying the Diagnostic Fee, and if the Diagnostic Fee revealed that my car did have the "turbocharger fail condition", that I could THEN contact GM to see IF they would cover the repair cost. In May, 2024, my car was at about 128,000 miles. I contacted two GM dealers: Les Stanford Buick in Ferndale, MI, and James Martin Chevy in Detroit, MI. Both refused to waive the Diagnostic Fee. So, in other words: - GM has created a defective, potentially DANGEROUS product, that GM acknowledges is defective. - GM created a warranty extension in which GM arbitrarily extended the warranty mileage and time. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ID

11635370

Incident

Jan 10, 2025

The contact owns a 2018 Buick Encore. The contact stated while the vehicle was parked, the contact's husband noticed there was oil leaking onto the ground underneath the vehicle. The contact’s husband, who is a certified mechanic, diagnosed the vehicle and determined that the failure was caused by a leaking oil cooler pipe. The contact was informed that the oil cooler pipe needed to be replaced. The vehicle was not repaired. In addition, the contact stated that the leak was persistent. The manufacturer was made aware of the failure but provided no assistance. The contact referenced GMC recall 43210; however, the contact was informed that the VIN was not associated with the recall. The contact was advised to contact the NHTSA Hotline to report the failure. The failure mileage was approximately 152,000.

NHTSA ID

11633066

Incident

Dec 27, 2024

Mileage

152,000 mi

Overdrive recall and check engine lights is on. We were just informed about the recall from our mechanic

NHTSA ID

11629408

Incident

Mar 13, 2024

Stalling and shuts off. Low power when accelerating. Car has been so slow to take off that when merging into on coming traffic I have to move to shoulder & then try again to prevent an accident. Coughs, putt & squeaking sounds.Car shakes while in park or not in motion. Check engine light on.

NHTSA ID

11615286

Incident

Aug 26, 2024

There are many Buick Encores, including 2018 that have a problem with acceleator position sensors. My car’s vin # shows that it does not have this notice, and thus no problem. However, in July this 2018 Buick Encore went into ‘limp mode, check engine light came on. Code for problem was 2138 (accelerator Pedal Position Sensor) The initial dealer solution was to apply dielectric grease. However, this ‘cure’ lasted . 15 miles, when it went into limp mode,,, again check engine icon came on THIS is very dangerous, as it cannot accelerate and from a stop, it does not move until a minute later… that is so frightening, I again took it to the deaer, same code of P2138, and now they recommend the accelerator pedal positon sensor replacement…. THIS is identical to the problems with the other Encores, This is a severe safety issue, and the rest of the 2018 Buick Encores should be included for notification AND repair .

NHTSA ID

11612619

Incident

Jul 16, 2024

The contact owns a 2018 Buick Encore. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power, power steering, and brake functionality. The vehicle began to shake, and the brakes and steering wheel became inoperable. The check engine warning light was illuminated. The vehicle was taken to the local dealer, who was unable to determine the cause of the failure. The vehicle was not diagnosed or repaired. The vehicle was taken back to the local dealer, where the mechanic test drove the vehicle but was unable to duplicate the failure. While driving, the fan failed to turn off. The vehicle was taken to the local dealer Orange Buick GMC (3883 W Colonial Dr, Orlando, FL 32808), where it was diagnosed that the coil and relay needed to be replaced. The vehicle was repaired, but the failure recurred. The contact stated that while driving the vehicle failed to accelerate above 65 MPH. The brake pedal was depressed but the vehicle failed to respond. The vehicle was taken back to another local dealer, Gettel Chevrolet Buick GMC (1901 Tamiami Trl, Punta Gorda, FL 33950), where it was diagnosed that the fan, relay, and spark plugs needed to be replaced. The vehicle was not repaired. The manufacturer was contacted and informed the contact about repairing the vehicle and the process for reimbursement. The failure mileage was approximately 20,000. The VIN was not available.

NHTSA ID

11607573

Incident

Feb 1, 2019

Mileage

20,000 mi

Turbo charger has A leak, dealer stated they knew it had a leak but they couldn't find it. All they did was clear the code. My car has A check engine light, and a trouble code of PO299, does not maintain proper speed, has issues with acceleration.

NHTSA ID

11606926

Incident

Mar 27, 2024

The contact owns a 2018 Buick Encore. The contact stated that the check engine warning light was illuminated. The contact stated that soon after the warning light appeared, the engine struggled to remain running. The contact depressed the accelerator pedal while in park to prevent the engine from shutting off. In addition, the contact stated that the vehicle hesitated upon depression of the accelerator pedal while driving at various speeds. The dealer and the manufacturer were notified of the failure. The vehicle was not diagnosed or repaired. The failure mileage was unknown.

NHTSA ID

11577992

Incident

Feb 18, 2024

We took our 2018 buick encore in to get the turbo fixed for the recall. The mechanic told us he can't test the turbo on it because the oil line going into the turbo isn't working and he has multiple other vehicles in for the SAME issue and they have been sitting in his back lot since December because he can't get the part in because everyone is out of stock. We will have to pay out of pocket for the oil line issue which will be $2300. So the turbo going bad is not the only issue this recall should cover. Because the oil line supplying the turbo should be included with the recall!

NHTSA ID

11577432

Incident

Mar 14, 2024

I have been employed in the Automotive Parts and Repair business for over forty years. I notice my vehicle exhaust sounded different than usual. I suspected the flex pipe part of the front exhaust pipe was leaking. This was confirmed by my local auto repair shop during a service visit. During my time as GM Parts Manager I can speak from experience to the problems these flex pipes cause because I kept two or three of them on the shelf to repair vehicles. My concern is exhaust fumes entering the passenger compartment of my vehicle because the flex pipe leaking which is just off the exhaust manifold. I contacted the local dealership where my vehicle was purchased because there still is a "Emission Warranty in effect. My 2018 Buick Encore has less than 50000 miles on it . I also contacted the Northeast Region District Service Manger with my concerns.

NHTSA ID

11564273

Incident

Oct 1, 2023

When driving, the vehicle will stutter and make the car feel as though it’s bubbling, once you come to a stop, the vehicle will shut off. This is a huge safety concern considering I have children and if the vehicle just turns off and I shouldn’t be braked for a while I can get hit. I have almost been hit 4x since this has started because the car shuts off when attempting to brake or braking completely. After speaking to multiple mechanics over this car it seems to be a common issue for it.

NHTSA ID

11536655

Incident

Aug 4, 2023

Feel like the car is loosing drive/power and not accelerating. I was driving and the engine light started flashing. No power to go up the hill, it could have gone backwards. Car does not accelerate made a whirring noise when it was turned off. Dangerous situation. Service Bulletin #N212338400

NHTSA ID

11472397

Incident

Jul 1, 2022

Turbo charger malfunction. Confirmed by dealership and had to be replaced. Stabilitrak malfunction. Car is stalling out at a red light or stop sign, and/or jerking hard. Stalled out in middle of an intersection with my children in the car. Ongoing problem.

NHTSA ID

11471666

Incident

Jun 29, 2022

My vehicle would not start and I had no control over the computerized system.

NHTSA ID

11468559

Incident

Jun 8, 2022