The 2017 Buick LaCrosse is a complete redesign on GM's E2XX platform, sharing architecture with the Chevy Impala and Cadillac XTS replacement. It uses a naturally aspirated 3.6L LGX V6 with a Hydra-Matic 8L45 8-speed auto. Watch for 8-speed shift shudder, AFM-related (where applicable - some 3.6L variants lack AFM) issues, and infotainment growing pains.
GM's 8L45/8L90 8-speed automatic has a well-documented torque-converter shudder issue across multiple GM models. A fluid flush with Mobil 1 LV ATF HP often helps. Class action lawsuits have been filed.
GM 8L45 (and 8L90) 8-speeds shudder at 30-45 mph, especially in light-throttle cruise. Multiple TSBs and class-action lawsuits exist. Fluid flush with the latest Dexron HP often resolves it.
View P0700 Diagnosis →Older GM 3.6L V6 (LFX/LLT) had widespread timing chain problems. The 2017 LGX is improved but stretch can still occur with poor maintenance. Cold-start rattle is a red flag.
View P0017 Diagnosis →New-for-2017 IntelliLink with embedded nav had frequent freezes and CarPlay drops at launch. Software updates have improved it significantly.
Run free diagnosis →eAssist 24V lithium battery can fail or lose capacity by 60K-90K mi. Replacement is moderate cost.
Run free diagnosis →Plastic window regulator clips break, dropping the window into the door. Common GM wear item.
Run free diagnosis →Aggressive auto stop/start cycles can be jerky in stop-and-go. No widespread failures but a frequent complaint.
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Quiet, comfortable, undervalued large sedan. The 8-speed shudder is the main worry; test-drive for it. A fluid flush is cheap insurance after purchase.
Launch year of the generation, so middle-of-the-pack. 2018-2019 saw infotainment and 8-speed software improvements. Good value for a comfortable cruiser.
Expect $500-800/year in routine costs. Lifetime non-routine cost typically $2,500-4,500 to 150K miles, with the 8-speed and 3.6L V6 driving most expense if issues develop.
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If your 2017 LaCrosse is throwing a check engine light, these are the codes most often associated with the problems above. Click any code for full diagnosis steps and typical repair costs.
About average. The 3.6L V6 and 8-speed are mostly reliable, but the 8L45 torque-converter shudder is widespread.
8-speed torque-converter shudder around 30-45 mph at light throttle. Often improved by an ATF flush with the updated fluid.
Yes - class action lawsuits have been filed against GM regarding the 8L45 and 8L90 8-speed shudder on multiple models.
Less than the older 3.6L LFX/LLT. Stretch can still occur with skipped oil changes. Treat any P0017 code urgently.
A handful including powertrain and airbag items. Always check NHTSA by VIN.
180,000-220,000 miles with regular maintenance and a clean 8-speed history.