What Does P0171 Mean on Your 2024 Buick Enclave?
Your 2024 Buick Enclave has triggered a P0171 code, meaning the engine control module has detected a lean air-fuel mixture on Bank 1. The completely redesigned 2024 Enclave features a new 2.5-liter turbocharged four-cylinder engine producing 328 horsepower, replacing the previous 3.6L V6. Since this is a four-cylinder engine, Bank 1 refers to the single cylinder bank. The ECM is compensating by adding extra fuel to balance the mixture.
Symptoms You Might Notice
- Illuminated check engine light
- Rough or unsteady idle
- Hesitation or lag when pressing the accelerator
- Fuel economy lower than the expected 23-29 MPG
- Subtle vibration at idle or low speeds
- Reduced power feel compared to normal operation
Common Causes of P0171 on the 2024 Buick Enclave
As a brand-new model with a new engine, warranty coverage is your best friend here:
- Boost or Intake Leak (30% likelihood) — The new turbo engine has charge pipes and intercooler connections that may not be perfectly sealed from the factory.
- ECU Calibration Issue (30% likelihood) — First-year production of the new 2.5T engine may have fuel mapping refinements available via software update.
- MAF Sensor Problem (25% likelihood) — A contaminated or miscalibrated mass air flow sensor causing incorrect airflow readings.
- Fuel Delivery Component (15% likelihood) — A weak fuel pump, fuel pressure sensor issue, or injector problem preventing proper fuel supply.
How to Diagnose the Problem
- Visit your Buick dealer — The 2024 Enclave is covered by GM's 3-year/36,000-mile bumper-to-bumper warranty plus 5-year/60,000-mile powertrain warranty. Let the dealer diagnose this at no cost.
- Ask about TSBs — New engine platforms often have Technical Service Bulletins addressing calibration and fuel trim issues.
- If diagnosing yourself — Use a quality OBD-II scanner to check fuel trim values and freeze frame data.
- Smoke test — A smoke machine pumped into the intake will reveal any hidden boost leaks.
- Monitor fuel pressure — The scan tool can show fuel rail pressure in real time to identify delivery issues.
Repair Options and Cost Breakdown
- Boost or intake leak repair: $100–$350. Should be covered under warranty for a new vehicle.
- ECU software update: $0–$200. Free under warranty or TSB. Standard dealer labor rate applies out of warranty.
- MAF sensor replacement: $130–$280. Part cost is $50–$130. Easy DIY if out of warranty.
- Fuel system repair: $400–$900. Covered under powertrain warranty. Out of pocket costs vary by specific component.
Prevention Tips
- Use quality fuel from Top Tier stations
- Keep up with all scheduled dealer maintenance
- Report any performance changes to the dealer while under warranty
- Use GM-recommended oil and filter specifications
- Avoid aftermarket intake modifications without proper tuning
Warranty Coverage
Your 2024 Buick Enclave is covered by GM's comprehensive warranty: 3 years/36,000 miles bumper-to-bumper and 5 years/60,000 miles powertrain. Any P0171-related engine or fuel system repair should be covered at no cost. Always go to the dealer first before paying for outside repairs.