Buick · Known Issues

2019 Buick Enclave Problems: 3 Known Issues

2019 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated August 2026

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019 Buick Enclave has 3 documented known issues, with 2 rated critical. The most serious are Cylinder-Head Porosity Can Contaminate Engine Oil (PIP5674) and P2731 Software Anomaly Can Leave Only 1st or Reverse (18-NA-379). DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Buick Enclave problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2019 Buick Enclave has 3 documented issues. The most frequently reported are: Cylinder-Head Porosity Can Contaminate Engine Oil (PIP5674), P2731 Software Anomaly Can Leave Only 1st or Reverse (18-NA-379), Low-Speed Torque-Converter Clutch Shudder (18-NA-091 / PIP5608F). Of these, 2 are rated critical and should be addressed promptly.

Is the Buick Enclave reliable?

The 2019 Buick Enclave has 3 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 2 issues are rated critical: Cylinder-Head Porosity Can Contaminate Engine Oil (PIP5674) and P2731 Software Anomaly Can Leave Only 1st or Reverse (18-NA-379). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

What is the 2019 Buick Enclave Cylinder-Head Porosity Can Contaminate Engine Oil (PIP5674)?

GM PIP5674 applies to 2019 Enclave vehicles with the 3.6L LFY engine. Internal porosity near an outer cylinder-head bolt area can allow coolant to contaminate the engine oil, producing a ticking noise, coolant loss, very dark or sticky oil and a check-engine light with cam/crank… Severity: high.

What is the 2019 Buick Enclave P2731 Software Anomaly Can Leave Only 1st or Reverse (18-NA-379)?

GM Bulletin 18-NA-379 applies to 2019 Enclave vehicles with the 3.6L LFY engine and 9T65 M3W automatic transmission. A transmission-control software anomaly can illuminate the MIL, leave only 1st gear or reverse, prevent upshifts, limit the vehicle to about 25 mph or make the 1-2… Severity: high.

What is the 2018-2021 Buick Enclave Low-Speed Torque-Converter Clutch Shudder (18-NA-091 / PIP5608F)?

GM documents low-speed torque-converter clutch shudder on 2018-2021 Enclave vehicles with the 9T65 automatic transmission. Drivers may feel a slight shudder, surge, fishbite or chuggle during a light-throttle shift below 40 mph when the TCC reapplies. PIP5608F says 2019-2021 case… Severity: medium.

2019 Buick Enclave Problems: 3 Known Issues

All 3 Known Issues

2019 Buick Enclave: P2731 Software Anomaly Can Leave Only 1st or Reverse (18-NA-379)#

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2018-2021 Buick Enclave: Low-Speed Torque-Converter Clutch Shudder (18-NA-091 / PIP5608F)#

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2019 Buick Enclave: Cylinder-Head Porosity Can Contaminate Engine Oil (PIP5674)#

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Other Buick Models

Frequently Asked Questions

What are the most common Buick Enclave problems?

Is the Buick Enclave reliable?

What is the 2019 Buick Enclave Cylinder-Head Porosity Can Contaminate Engine Oil (PIP5674)?

What is the 2019 Buick Enclave P2731 Software Anomaly Can Leave Only 1st or Reverse (18-NA-379)?

What is the 2018-2021 Buick Enclave Low-Speed Torque-Converter Clutch Shudder (18-NA-091 / PIP5608F)?