What P0174 Means on Your 2024 GMC Terrain
When your 2024 GMC Terrain triggers a P0174 code, the engine control module has detected a lean air-fuel condition. The 2024 Terrain uses a 1.5L turbocharged four-cylinder engine producing 175 horsepower. As an inline-four, it has one bank, and P0174 means the lean correction has exceeded normal limits.
Your 2024 Terrain is under full warranty, so this should be a dealer visit at no cost to you.
Symptoms
- Check engine light on
- Rough idle
- Hesitation during acceleration
- Reduced fuel economy
- Diminished turbo response
- Possible stalling
Common Causes
- Boost Leak (35% likelihood) – Factory assembly issue with turbo hose clamps, couplers, or intercooler connections.
- MAF Sensor Issue (25% likelihood) – Factory defect or early contamination.
- Fuel System Problem (20% likelihood) – Faulty injector or fuel pressure issue.
- Software Calibration (20% likelihood) – GM may have ECU updates for fuel trim optimization.
Diagnosis
- Dealer visit – Under warranty, the dealer handles everything.
- TSB check – Look for service bulletins on 2024 Terrain lean codes.
- Boost leak test – Find intake system leaks.
- Component verification – MAF, injectors, fuel pressure testing.
Repair Costs
- All repairs should be covered under GM's warranty.
- Out-of-pocket estimates: Boost leak $80–$350, MAF $80–$220, fuel system $200–$500, software update $0–$150.
Take It to the Dealer
With the 2024 Terrain under GM's 3-year/36,000-mile bumper-to-bumper and 5-year/60,000-mile powertrain warranty, the dealer will diagnose and fix this at no charge. They have GM-specific tools and can apply any software updates.
Prevention
- Follow GM's service schedule
- Use quality fuel
- Keep OEM air filtration components
- Report drivability changes to the dealer
- Stay current on software updates