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%).
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
Ask the seller whether the transmission has ever been repaired or replaced, and whether the car has shown shuddering, slipping, delayed or harsh shifts, or a whine at speed.
Drive it from a cold start and long enough to warm up. Many transmission faults hide once the car is warm.
Get an independent pre-purchase inspection from a mechanic you choose, and tell them to focus on the transmission.
Ask for service records. A transmission already replaced under warranty is a different car from one that was not.
Have the VIN?Paste it and get the full report for that car. First report free, then a 30-day pass covers a whole car search.
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.