2018 Buick Cascada
The 2018 Buick Cascada is sold in the U.S. as a gas convertible. The most efficient version, the Cascada, is EPA-rated at 24 mpg combined. NHTSA lists no recall campaigns for this model year so far (Safety Signal A). Owners have filed 11 complaints, most often about the engine. NHTSA crash-tested it at 5 stars overall.
Specs & fuel economy
Source: EPA fueleconomy.gov| Configuration | Powertrain | Drive | Engine / motor | City | Hwy | Comb | Annual fuel* |
|---|---|---|---|---|---|---|---|
| Cascada | Gas | FWD | 1.6L 4-cyl turbo | 21 | 29 | 24 | $3,400 |
*EPA estimate at 15,000 miles/year at EPA reference fuel and electricity prices. fueleconomy.gov record ids: 39413.
Emissions & certification
Source: EPA emission certificates| Configuration | Smog rating | Emission standard | Where it can be sold new | SmartWay |
|---|---|---|---|---|
| Cascada | 5 / 10 | California LEV-III ULEV70 / Federal Tier 3 Bin 70 | All 50 states (federal, all altitudes); California and states following California standards | — |
Certified for all fifty states, so it can be registered new anywhere in the U.S.
The smog rating scores tailpipe pollutants other than greenhouse gases, 1 (worst) to 10 (best), and is comparable only within a model year. The standard is the federal bin or California tier the configuration was certified to. Both come from the EPA certificate behind the window sticker.
Specifications filed with NHTSA
Source: NHTSA vPICDimensions Exterior
| Body style | Convertible/Cabriolet |
| Doors | 2 |
| GVWR class | Class 1: 6,000 lb or less (2,722 kg or less) |
Engine Basics
| Cylinders | 4 |
| Displacement | 1.6 L |
Fuel Economy
| Fuel | Gasoline |
Seating
| Seat rows | 2 |
| Seating capacity | 4 seats |
Driver assistance
Standard: Anti-lock brakes, Backup camera, Electronic stability control, Forward collision warning, Lane departure warning
Filed by the manufacturer with NHTSA under the federal vehicle-identification rule and decoded from the VIN pattern — not a manufacturer press kit, so it describes the configurations we could identify rather than every trim (seen: Premium Group, Sport Touring). Figures for the trim you are looking at may differ.
Factory warranty running out?
The 2018 Buick Cascada is in the years where transmission, electronics and drivetrain repairs land on the owner. What an extended plan does and does not cover is worth reading before a dealer quotes you one.
What to check before you buy →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Recalls (0)
Source: NHTSA recall databaseNo NHTSA recall campaigns are on file for the 2018 Buick Cascada. New campaigns appear here within a week of NHTSA posting them.
These are vehicle campaigns — the ones the automaker filed against this model. NHTSA also records equipment recalls, filed by a parts maker against a component (a tyre, a child seat, an aftermarket part), and those are not listed here or counted above. nhtsa.gov/recalls shows both for a VIN.
Hear about a recall before the letter does
The manufacturer’s letter is the last step of a recall: it has up to 60 days after filing to mail owners, at the address on the registration. We email you the day NHTSA posts a recall on the 2018 Buick Cascada, with what to do next. Nothing else, ever — no newsletter, no marketing, one-click unsubscribe in every message.
Parts & accessories for the 2018 Buick Cascada
Search by fitment on eBay Motors — OEM take-offs, aftermarket, and the trim pieces dealers no longer stock. The listing and the price are the seller's.
Find parts for this Cascada →Owner complaints
Source: NHTSA complaint database1 involved a crash · 0 a fire · 1 injuries · 0 deaths reported
39 per 10,000 built · Buick reported 2,838 Cascada built (its Early Warning production report to NHTSA)
Filed per year: 2020: 1 · 2021: 1 · 2023: 1 · 2025: 4 · 2026: 4
Most-cited components
In owners' own words
Filed with NHTSA by the people who own these cars, one per problem area. Quoted as written, with anything identifying removed.
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.
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
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.
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.
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
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
Complaint counts are raw owner reports to NHTSA, not verified defects, and scale with how many were sold. Use them to spot patterns, not to rank.
Reported by Buick itself: 1 death-or-injury claim on this model year in its quarterly Early Warning reports to NHTSA (49 CFR 579.21): 4 injured, as claimed, not verified — about 35 per 100,000 built. Every Cascada model year, by year and system → Dated and by system, they are exhibit F of the defect dossier.
Crash ratings
Source: NHTSA NCAP| Configuration | Overall | Frontal | Side | Rollover | Rollover risk |
|---|---|---|---|---|---|
| C FWD | ★★★★★ | ★★★★☆ | ★★★★★ | ★★★★☆ | 11% |
NHTSA New Car Assessment Program.
Service bulletins & campaigns
Source: NHTSA manufacturer communications- Term not in NHTSA’s summary · GM warranty extension 22-NA-244This warranty administration service bulletin provides information about GM Accessories - Dealer-Installed, Repaired or Replaced During Warranty Coverage Period.
The term and the vehicles it covers are the manufacturer’s, as NHTSA’s summary of each filing states them; a dealer checks one particular car by its VIN. Every GM warranty extension (33) → · Every warranty extension on file, all makes →
Most often about: Equipment, Engine, Electrical System, Unknown Or Other, Power Train.
- PIT5698F Service bulletin2026-09-26 · Unknown Or Other
- This PI provides Diagnostics tips on how the LIN bus works and how to diagnosis it.
- PIP4902W Service bulletin2026-09-04 · Unknown Or Other
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- PIT5099J Service bulletin2026-07-21 · Unknown Or Other
- PI to help diagnose A/C concern
- PIT3271Q Service bulletin2026-04-01 · Unknown Or Other
- This preliminary information communicates information about how to determine if a wheel and tires size change is available.
- PIP6104 Service bulletin2026-03-09 · Unknown Or Other
- This Preliminary information communicates the steps on how to save a GDS2 Session Log and upload to a Technical Assistance Case in CX Connect.
- PIP4902V Service bulletin2026-03-09 · Unknown Or Other
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- PIP4902U Service bulletin2026-01-08 · Unknown Or Other
- This preliminary information advises a dealer on how to email GDS2 session logs into Technical Assistance.
- PIT5214G Service bulletin2025-11-20 · Unknown Or Other
- This Preliminary Information communication provides information to the technician about vehicles that have had multiple repair attempts that are being performed on customer’s vehicles that exhibit vibration conditions without utilizing the support of General Motors Technical Assistance Center. If valid vibration frequency or Road Force Variation data has been collected and a repair attempt does no
A service bulletin is the manufacturer telling its dealers how to diagnose or repair a known condition. It is not a recall, not a finding that the vehicle is defective, and the work is not automatically free — though a bulletin is often what a dealer works from when you describe a symptom, so quoting the document number can save a diagnosis. The count is every communication filed; the list shows the most recent, one entry per campaign, because a single campaign is usually filed as several documents on the same day. The summaries are NHTSA's; the full documents come from the manufacturer.
Diagnostic trouble codes on file
Source: NHTSA manufacturer communications and complaintsCodes documented against this model year in the federal record. A code appearing here does not mean this vehicle will set it — it means the code is part of this nameplate-year's documented history.
| Code | What it means | Most often filed under | Where it appears |
|---|---|---|---|
| B3055 B3055 on Buick → | Manufacturer-defined — the meaning is set by the automaker, not the standard. | Electrical System · Battery → | 9 bulletins |
| B3060 B3060 on Buick → | Manufacturer-defined — the meaning is set by the automaker, not the standard. | Electrical System · Battery → | 9 bulletins |
| B3935 B3935 on Buick → | Manufacturer-defined — the meaning is set by the automaker, not the standard. | Electrical System · Battery → | 9 bulletins |
| P0300 P0300 on Buick → | Misfire detected, but not isolated to one cylinder. | Engine · Ignition coils → | 7 bulletins |
| P0308 P0308 on Buick → | Cylinder 8 is misfiring. | Engine · Ignition coils → | 7 bulletins |
| P050D P050D on Buick → | Manufacturer-defined — the meaning is set by the automaker, not the standard. | Engine | 7 bulletins |
| P0442 P0442 on Buick → | A small leak in the evaporative emissions system. | Electrical System · Gas cap → | 3 bulletins |
| P0455 P0455 on Buick → | A large leak in the evaporative emissions system — often a fuel cap left off. | Electrical System · Gas cap → | 3 bulletins |
| U0028 U0028 on Buick → | Manufacturer-defined — the meaning is set by the automaker, not the standard. | Steering | 2 bulletins |
Generic codes (the second character is 0 or 2) mean the same thing on every vehicle sold in the United States. Manufacturer-specific codes (1 or 3) mean whatever the automaker assigned, and no honest source can define them for you — which is why the ones here carry the evidence instead of a definition. A code is a link when enough separate federal documents name it across the catalogue to be worth a page of its own; the rest are listed here, where the vehicle is the context that makes them mean something.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Cascada by model year
all years, side by side →Common questions about the 2018 Cascada
Source: EPA, NHTSA and manufacturer press kitsDoes the 2018 Buick Cascada have any recalls?
No NHTSA recall campaigns are on file for the 2018 Buick Cascada. New campaigns appear here within a week of NHTSA posting them, and a clean sheet on a recent model year often just means the vehicle is new.
How safe is the 2018 Buick Cascada?
NHTSA gave the 2018 Buick Cascada 5 stars overall in its New Car Assessment Program tests — 4-star frontal crash, 5-star side crash, 4-star rollover. WhichTrim also grades it A (100/100) on its recall record, which is a different question from crash protection.
What is the fuel economy of the 2018 Buick Cascada?
For the 2018 Buick Cascada, the best EPA combined figure is 24 mpg. Figures are the EPA's own, per configuration, and every one is listed above.
What do owners complain about on the 2018 Buick Cascada?
Owners have filed 11 complaints with NHTSA about the 2018 Buick Cascada, most often about engine, structure, air bags. Of those, 1 involved a crash, 1 reported injuries. Complaints are unverified owner reports, so treat the pattern as a signal and the individual report as an anecdote.
How clean is the 2018 Buick Cascada?
The EPA smog rating for the 2018 Buick Cascada is 5 out of 10. That score covers tailpipe pollutants other than greenhouse gases, and it only compares vehicles within the same model year. It is certified for all fifty states, so it can be registered new anywhere in the U.S. Its configurations were certified to different standards — California LEV-III ULEV70, Federal Tier 3 Bin 70 — which the table above lists per configuration.
Are there service bulletins for the 2018 Buick Cascada?
The manufacturer has filed 716 service bulletins and related communications with NHTSA for the 2018 Buick Cascada, most often covering equipment, engine, electrical system. The most recent is dated 2026-09-26. A bulletin is not a recall: it is the repair procedure a manufacturer sends its dealers for a condition it knows about, and the work is not automatically paid for. It is still worth knowing — if the symptom matches, quoting the bulletin number at the service desk can save a diagnosis. The document numbers and summaries are listed above.
What we hold, and what an empty row means
Paid vehicle-history reports will not tell you the difference between “nothing happened to this car” and “we never received that record” — both of the big two say as much in their own help pages. Most of what is on this page comes from complete federal registers, so we can tell you which is which, row by row.
| Data | Held | Source | What it covers — or what empty means |
|---|---|---|---|
| Fuel economy & configurations | 1 configurations | EPA certification records | Every configuration the EPA certified for sale, with its own test figures. |
| Emission certificates | 1 configurations | EPA emission certificates | Smog rating, standard and the sales area that decides where the car can be sold new. |
| Recalls | none | NHTSA recall campaigns | No campaign has been filed. Because the register is complete, an empty row here means there is nothing to find — not that we are missing it. |
| Owner complaints | 11 | NHTSA complaint database | Also complete, but unverified: these are reports owners filed, not findings. Counts scale with how many were sold. |
| Crash ratings | 1 tested | NHTSA NCAP | Only the configurations NHTSA chose to crash-test, which is never all of them. |
| Service bulletins | 716 | NHTSA manufacturer communications | Everything the manufacturer told its dealers about a defect or malfunction, short of a recall. |
| Investigations | none | NHTSA Office of Defects Investigation | No defect investigation has been opened. |
| Driver-assist crash reports | none | NHTSA Standing General Order 2021-01 | No report has been filed. Only entities named in the order report, and only crashes they hear of — so this is also what an unequipped car, or a manufacturer without telematics, looks like. |
| Specifications filed with NHTSA | 8 fields | NHTSA vPIC, decoded from VIN patterns | What the manufacturer filed under the federal VIN rule — a configuration, not the full trim ladder. |
| Trims, pricing & equipment | none | Manufacturer press kit | We have not transcribed a press kit for this model year yet. This is our gap, not the manufacturer's — the one row here where an empty cell means we are behind. |
Rebuilt nightly; this page was generated 2026-10-26. Every figure above is traceable to the source named beside it, and the JSON for this page carries the same values with their identifiers.
Sources & method
Safety Signal starts every model-year at 100 and subtracts points per open NHTSA recall campaign by severity: critical 15 (fire risk, park-outside or do-not-drive advisories), high 8 (brakes, steering, airbags, loss of drive power, structure, battery), moderate 6, minor 3 (software, labels, lighting fixed by an update). The most serious recall counts in full and each further one counts 85% of the one before, because a vehicle sold in millions is recalled more often than a rare one without being more dangerous — and because a flat subtraction bottomed the scale out, scoring a vehicle with 22 recalls within a point of one with six. A ≥ 90, B ≥ 80, C ≥ 70, D ≥ 60, otherwise F. Read it as what it counts: recall campaigns on the federal record, weighted by severity. The damping reduces the sales bias by roughly 40% but does not remove it: like our complaint counts, this is not normalized by how many were sold, so a best-seller still scores somewhat worse than an obscure model with the same real risk. NHTSA crash ratings, do-not-drive and park-outside advisories, and the crash, fire, injury and death counts in owner complaints are reported separately on every page and never blended into the letter — a vehicle can hold five stars and a poor letter at once, and where that happens we say so rather than leave you to notice. Because the scale subtracts from a clean sheet, a model year too new to have been recalled, complained about or bulletined scores full marks on an empty record; we label those grades provisional rather than present them as earned.
EPA figures come from fueleconomy.gov vehicle records. Recalls, complaints, investigations and crash ratings come from NHTSA's public flat files, refreshed nightly.