2018 Buick Cascada Owner Complaints

A squealing sound was coming from the top of my engine and I had low/rough idle and it progressed to a low voltage output and check engine lights. This happened while i was driving on the highway and my speed was eratic and I had to cross 2 lanes to get the next exit. The problem has been reproduced my an indepent service center. The PCV vent constantly pulled vacuum (was stuck open to atmosphere) and the sound was only relieved by removing the dip stick. No warning lamps messages or symptoms. There is NO part number difference in the Camshaft cover between model years 2016 thru 2019 Cascadas. I believe that the 2018 should be included in the same Special coverage as the 2016 and 2019 model years. This issue has been noted in several Casada forums and is also the same as NHTSA complaint IDs: 11593462, 11587414, 11574318, 11515179.

NHTSA ID

11748141

Incident

Jul 1, 2026

Vehicle is a 2018 requiring valve cover replacement due to an issue that was recalled on previous years, most recently 2016. Extended warranty was offered for these repairs. TSB Special Coverage N192291620 – Camshaft Cover Replacement (later superseded by N232395320). This should be reviewed for additional recalls.

NHTSA ID

11747657

Incident

Jun 29, 2026

The contact owns a 2018 Buick Cascada. The contact stated that while operating the vehicle, the check engine warning light illuminated. The vehicle was taken to the local mechanic to be diagnosed, and it was determined that the air intake valve was faulty and needed to be replaced. The vehicle was not yet repaired. The local dealer was notified of the failure. The manufacturer was not yet contacted. The failure mileage was 72,000.

NHTSA ID

11728477

Incident

Mar 26, 2026

Mileage

72,000 mi

PCV Failure at 62,000 miles. GM extended warranty on 2016 models that demonstrated this problem. Appears to be a design flaw and often fails again after repair. $2000 + job to repair

NHTSA ID

11714025

Incident

Jan 26, 2026

While driving down the highway my vehicle decreased in power and then I heard a loud whistle or whining sound. Upon examination at the dealership, they determined that the PCV system had failed. The positive crankcase ventilation system caused my Camm to leak and created a vacuum leak which blew out the seals of my vehicle. Upon further investigation I found that GM was involved in a class action lawsuit for the 2016 models and that an extended warranty was given for 2016 -2019 Cascada models. 15 years 150,000 miles. However, my vin and year was not included for the same problem.

NHTSA ID

11692340

Incident

Sep 19, 2025

Camshaft cover recall on exact model car for different year model, recall doesn’t cover this years model, however, I have the same issue.

NHTSA ID

11684855

Incident

Sep 1, 2025

Chirping sound from under hood took to GM dealer, they changed the belt and transitioned and was still chirping. Now say it is pvc/camshaft cover.

NHTSA ID

11672790

Incident

Jul 11, 2025

The contact owns a 2018 Buick Cascada. The contact stated that while operating the vehicle, there was a whistling sound coming from the engine compartment, with the check engine warning light displayed. The vehicle was taken to the local dealer who diagnosed that the intake manifold was faulty and needed to be replaced. The vehicle was not yet repaired. The manufacturer was not contacted. The failure mileage was 80,000.

NHTSA ID

11637586

Incident

Jan 20, 2025

Mileage

80,000 mi

17-NA-216 was originally issued in in 2017 updated in 2019 to include 2018 model. Back windshield detaches from canvas/folding top. Was concerned primarily about safety of my child who drives car that windshield would completely fly off when driving. I replaced the folding top cover per bulletin. GM refused to reimburse stating not recalled since not safety issue. I disagree. Damage it could cause if flys off while driving could cause an accident for driver or other cars on the road who are hit with window or avoid being hit.

NHTSA ID

11517691

Incident

Mar 13, 2023

The contact rented a 2018 Buick Cascada. The contact stated while driving at 5 MPH and making a right turn, the brake pedal was depressed but failed to respond, which caused another vehicle going at an undisclosed speed to crash into the front driver side of the vehicle. There were no warning lights illuminated. The air bags failed to deploy. The contact was knocked unconscious and was able to exit the vehicle with the assistance of emergency services. The contact went to the hospital the next day and was informed she had sustained a broken sternum. A police report was filed. The vehicle was towed to an undisclosed location. The dealer was made aware of the failure and advised to tow the vehicle to their location so they could diagnose it. The manufacturer was made aware of the failure and did not provide assistance. The VIN and failure mileage was unavailable.

NHTSA ID

11422014

Incident

May 30, 2021

BOTH QUARTER PANELS HAVE AT 25 ROCK CHIPS. THE FRONT WHEEL STICKS OUT AND IS FLICKING THE ROCK BACK TO THE QUARTER PANELS WHICH STICKS EVEN FURTHER OUT.

NHTSA ID

11311201

Incident

Feb 24, 2020

Mileage

8,088 mi