Buick Encore misfire problems

Filed Mar 9, 2026 · Driver assistance, Engine · 44,000 miles · CT

The contact owns a 2017 Buick Encore. The contact stated that while driving at 40 MPH, the engine was running rough, and the vehicle experienced reduced power. The stabili-trak and the check engine warning lights were illuminated. The vehicle was taken to Auto Zone, where a diagnostic trouble code for a cylinder misfire was retrieved. The vehicle was taken to an independent mechanic, where the cylinder #1 ignition coil and spark plug were replaced, but the failure persisted. The mechanic determined that the engine might need to be replaced; however, the mechanic did not specialize in engine diagnostic tests. The manufacturer was notified of the failure and referred the contact to the dealer for a diagnostic test. The vehicle was taken to the dealer, where it was diagnosed, and it was determined that the engine needed to be replaced. The contact related the failure to GM Special Coverage Number: N232395330; however, the manufacturer informed the contact that the VIN was not included, and the contact was referred to the federal safety agency Hotline for assistance. The vehicle was not repaired due to the cost. The failure mileage was approximately 44,000.

Filed Feb 25, 2025 · Engine, Fuel system · OR

My wife is [XXX] and I am [XXX] old. We purchased the 2016 Buick Encore with 29,000 miles from Buick GMC of Beaverton, Oregon on [XXX], expecting that it would out last both of us, since we are retired and only drive to the store and doctor's appointments; my wife has miraculously survived Stage IV cancer since February 1, 2019. The Encore is our only car and we depend on it for all transportation. We love the vehicle, changed the oil about every 3,000 miles, and have had no complaints for almost six years. On [XXX], my wife and I were driving home from shopping, in rain at night on [XXX] north bound, left lane, uphill at 55MPH in moderate traffic on a six-lane divided freeway. Suddenly the car lost half power, began missing and shaking badly, speed dropped to about 30 MPH with cars serving behind us, flying past us honking. We were panicked, not knowing if the car would seize up completely or the engine would explode. Fortunately, we limped off the highway without having to stop. We took the car back to the dealership where we bought it, for service. The next day they emailed a video of their inspection of the vehicle showing Cylinder 1 has very low compression of about 60 when normal should be 180 to 210 psi, which indicates a likely blown piston. April 30, 2019, the federal safety agency Service Bulletin 19-NA-090 describes the identical symptoms the Encore is experiencing: Misfire and low compression in one or more cylinders. Both the Buick GMC of Beaverton dealership and General Motors, 800‑521‑7300 are refusing to honor the original 70K mile warranty since they're indicating the warranty expired on 01/21/2023. We are devastated that because we pampered the vehicle and only drove it 17,000 miles in nearly 6 years, we are being unfairly penalized. GM admits that if we had driven the vehicle more and this same engine failure occurred at just 49K miles prior to January 20, 2023, they would immediately replace the engine. Help! We are requesting that the federal safety agency INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT

Filed Jan 10, 2025 · Engine · MI

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)

Filed Jul 4, 2024 · Engine · FL

Engine, vehicle purchased end 2019. Several repairs, New Battery, some warranty repairs. March of 2022 PO131 - HO2s PO171 fuel trim lean PO300 engine misfire Evap system flow PO496 P1101 intake airflow UO401, 71 invalid data from the motor. Jun 2023 Need a New Engine 10k (Dealership) Sought out 2nd opinion 8k for New Engine Vehicle has been dead ever since. Repairs surpass what’s owed.

Filed May 10, 2024 · Electrical, Fuel system · CT

Imthe original owner and purchased the car new 4 years ago. At 89,000 miles, the check engine light came on indicating codes for emission controls not working efficiently. Later additional codes indicated problems with the fuel evaporator. The car started having problems every time I filled up the gas tank it would stall, hesitate and have problems starting shortly after the fill up. Problem also occurred if I let the fuel level run down to 1 gallon when the reserve indicator light came on the fuel tank. So now I fill up when I reach a quarter tank. Steady driving for at least 10 minutes would clear the problem temporarily. Car hesitates, stalls and misfires when going uphill, steep hills and also when coming to full stop Such as a red light. Later additional problem of car hesitating and misfiring during acceleration. I have replaced the spark plugs and ignition coil. No change noticed. Awaiting mechanic diagnosis. This problem seems very similar to another complaint filed under the federal safety agency ID 11548946 in October 2023

Filed Jan 4, 2024 · Engine · TX

There is a known defect with the GM Ecotec engines, specifically the lack of retaining clip for the internal PCV valve, allowing it to become dislodged and drawn into the engine. Without the PCV valve, tremendous engine pressure is produced, leading to broken gaskets causing vacuum leaks, misfiring, severe vibration, and loss of power when accelerating (which can be a safety issue). Dorman produced a video outlining the issue and has re-engineered the part to prevent the issue from occurring: "Why GM 1.4L Ecotec engine intake manifold and valve covers repairs are often related" [XXX] This appears to be a fairly wide-spread issue with the GM Ecotec engines, and GM should perform a recall to replace these parts, and reimburse those who had to replace themselves. This also causes error codes requiring spark plugs to be replaced (they get fouled by oil) and the MAF Sensor. In troubleshooting, I also had to replace the distributor power bar and air intake hose. I have recipts for all parts, but file upload is not working on this site. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Nov 20, 2022 · Engine · CT

Bought a 2017 Buick Encore November 2020 less than 6 months into owning the car check engine light came on. Purge solenoid as well as the Camshaft and 1 other component had a leak brought it to dealership and it was covered under warranty for repairs. Fast forward about a year and a half there is another leak will be bringing back to dealership and paying out of pocket for leaks because of a rough idle, poor fuel economy, and another check engine light problem. Have also read articles about this particular cars not fairing well in the temperatures changes during the seasonal changes. Yet there is no recalls and no mention of Buick or GMC being held responsible for this recurring problem.

Filed May 19, 2021 · Engine · 80,000 miles · OH

The contact owns a 2016 buick encore. The contact stated while driving 65 MPH, the vehicle inadvertently decelerated to 10 MPH. The there was white smoke coming from the exhaust tip. The contact drove the vehicle to a service station and then had the vehicle towed to an independent mechanic for the vehicle to be diagnosed. The contact was informed that the turbo charger was defective and there was engine oil in the catalytic converter. The turbo charger and catalytic converter were replaced however, the failure recurred with the check engine warning light illuminated. The vehicle was taken to an unknown dealer to be diagnosed. The mechanic found a misfire on cylinder #3 and turbo charger as well as catalytic converter were full of oil . Additionally, there was not enough compression on the engine. The contact was informed that the engine needed to be replaced. The vehicle was not yet repaired. The manufacturer was informed of the failure. The approximate failure was 80,000.

Filed Nov 29, 2019 · Driver assistance, Transmission · 48,000 miles · CA

8/14-car was lacking power, service manager was able to duplicate issue on road test . 8/24-car service for rough idle and lack of power, service stabilitrak light on and check engine light on with an error code of p0171. In september, car started to shake while in park but no check engine light, dealer advise unable to do any repairs unless check engine light on. 11/27- check engine light on again for same code, p0171. Vehicle is currently in shop. Vehicle has had the same issues dec 2018 and at the time of purchase. Gm dealers are not able to fix turbo issue and p0171 issues. My vehicle is not operating as designed and it is a safety issue.

Filed May 6, 2019 · Engine, Fuel system · 66,790 miles · VA

Check engine light came on and then started flashing while in motion. The traction light came on and off repeatedly. The engine had reduced power and at times would only go 30-35mph even with pedal mashed all the way. I took the vehicle to o'reilly's and they checked the codes which show camshaft sensor, crankshaft sensor, cylinder 2 misfire, turbo underboost code and ABS code. Seems like a lot of issues for a vehicle with only 67,000 miles.