P0175 on the 2024 Buick Enclave: New Engine, New Considerations
The 2024 Buick Enclave received a major redesign with a new 2.5L LKQ turbocharged four-cylinder engine producing 328 hp, replacing the previous 3.6L V6. This engine is paired with a 9-speed automatic and available AWD. When P0175 appears on this all-new platform, the ECM has detected persistent over-fueling beyond its correction capability. On a first-year redesign with a new engine, this code warrants prompt dealer attention.
What You'll Experience
- Check engine light on the Enclave's new digital instrument display
- Fuel economy below the improved 23/29 MPG rating
- Dark exhaust smoke during turbo boost events
- Idle roughness — unusual for the refined Enclave
- Fuel odor from the exhaust
- Turbo boost hesitation or inconsistency
Causes on the New 2.5L Turbo
1. MAF Sensor Contamination
Even on a brand-new vehicle, the MAF sensor can be contaminated during assembly, dealer prep, or from driving in dusty conditions. The new 2.5L turbo is particularly sensitive to MAF accuracy because boost calculations depend on precise airflow measurement. Cleaning costs $10; GM OEM replacement is $110–$240.
2. ECM Software Calibration
As a first-year production engine in the Enclave, the 2.5L turbo is likely to receive ECM calibration updates that refine fuel mapping. GM regularly issues updates for new powertrains as they gather real-world operating data. A software reflash is free under warranty.
3. Turbo Boost Control Issue
The new turbo system uses electronic boost control that may need calibration refinement. A wastegate or boost solenoid that doesn't perform within specification causes over-boost and protective fuel enrichment. On a new vehicle, this is a manufacturing concern covered under warranty. Out-of-pocket would run $200–$500.
4. Direct Injection System Defect
The 2.5L uses high-pressure direct injection. An injector with out-of-specification flow or a high-pressure fuel pump issue can cause over-fueling. Manufacturing defects are covered under GM's comprehensive warranty.
What to Do
- Schedule a Buick dealer appointment — warranty diagnosis is the right approach
- Have them check for TSBs and ECM updates for the new 2.5L engine
- Request documentation of diagnostic findings
- Mention if the vehicle was recently in service or if driving conditions were unusual
Safe to Drive?
Normal driving is fine. Drive gently and avoid heavy throttle. The close-coupled turbo catalyst costs $800–$1,500 at Buick pricing. Schedule service within a week.
Warranty Coverage
The 2024 Enclave has GM's 3-year/36,000-mile bumper-to-bumper warranty and 5-year/60,000-mile powertrain warranty. The new turbo engine, all sensors, fuel injectors, and ECM are covered. The 8-year/80,000-mile emissions warranty adds converter and sensor coverage. Everything related to P0175 is covered at no cost.