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2018 Buick Enclave: engine and transmission complaints

HIGH COMPLAINT SIGNAL
50%
30 of 60 relevant owner complaints are about the engine, transmission or fuel system

50% of relevant owner complaints filed with NHTSA on the 2018 Buick Enclave are about the engine, transmission or fuel system. That is a model-level pattern, not bad luck.

Worse than 64% of the 1,230 model years we track (2010–2023).

Excludes 4 airbag, lighting and seat-belt recall complaints that would otherwise mask the signal (unadjusted: 47%).

NHTSA data checked September 13, 2026
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Drivetrain complaints
30
engine, transmission, fuel
Total complaints
64
this model year
Fires reported
0
owner-reported
Recall campaigns
0
5 crashes · 1 injuries

Complaints by component

SERVICE BRAKES21 · 33%
POWER TRAIN15 · 23%
ENGINE13 · 20%
ELECTRICAL SYSTEM9 · 14%
UNKNOWN OR OTHER8 · 13%
FUEL/PROPULSION SYSTEM4 · 6%

The years either side

2010
38%
101 of 275
2011
45%
77 of 212
2012
33%
36 of 132
2013
50%
26 of 69
2014
48%
40 of 292
2015
28%
17 of 171
2016
53%
16 of 141
2017
31%
10 of 179
2018
50%
30 of 64
2019
68%
26 of 42
2020
47%
25 of 56
2021
23%
5 of 25
2022
too few complaints
2023
too few complaints

Manufacturers fix things mid-generation. A bad year next to a clean one is common; the fix usually arrived in between.

Cleaner alternatives

Same car, a better year

Other midsize SUVs with no elevated signal in 2018

The percentage is each model year's drivetrain complaint share. No elevated signal describes the model year, not any one car; a well-kept example of a flagged model can still be the right buy, and any of these still needs an inspection.

What owners reported

SUSPENSION,FUEL/PROPULSION SYSTEM06/08/2026
I am submitting this letter to formally report two ongoing issues with my 2018 Buick Enclave. First, I have experienced persistent problems with the emissions purge valve. My vehicle has repeatedly triggered diagnostic trouble code P0496, indicating a malfunction in the purge valve system. I am aware that this issue h…
ELECTRICAL SYSTEM,ENGINE AND ENGINE COOLING05/26/2026
The contact owns a 2018 Buick Enclave. The contact stated that while driving at various speeds, the vehicle shut off and failed to restart. The vehicle was towed to the dealer, where the alternator was replaced 4 times before the dealer diagnosed that the failure was due to oil leaking onto the alternator and the batte…
POWER TRAIN05/12/2026
After two transmission flushes and being told by a Buick dealership's service technicians that nothing is wrong with the vechile's transmission, it has now failed completely at ~90k miles.

Three of 30 drivetrain complaints. The full report shows more, with quotes about the engine in the car you are looking at first.

Before you buy a 2018 Buick Enclave

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Experimental model-level information. This is not a vehicle inspection, vehicle-history report, financial advice or purchase recommendation. It describes patterns across a model year, not the condition of any individual vehicle.