What P0174 Means on Your 2024 GMC Yukon
A P0174 code on your 2024 GMC Yukon indicates that Bank 2 is running too lean. The 2024 Yukon offers the 5.3L V8 (355 hp), 6.2L V8 (420 hp), and 3.0L Duramax turbo-diesel. On the V8s, Bank 2 is the driver side (left side). The ECM detected that lean corrections on that bank are beyond normal range.
Your 2024 Yukon is brand new and under full warranty. Any P0174 issue should be handled by your GMC dealer at no cost.
Symptoms
- Check engine light illuminated
- Rough or fluctuating idle
- Reduced acceleration power
- Increased fuel consumption
- Engine hesitation
- Possible engine knock under load
Common Causes
- Vacuum Leak (30% likelihood) – Factory assembly issues with intake gaskets or hose connections.
- Fuel Injector Defect (25% likelihood) – A faulty injector from manufacturing on Bank 2 cylinders.
- MAF Sensor Issue (25% likelihood) – Factory defect or early contamination.
- Software Calibration (20% likelihood) – GM may have fuel trim optimization updates for 2024 models.
Diagnosis
- Take it to the dealer – Full warranty coverage means free diagnosis and repair.
- Check for TSBs – GM may have issued service bulletins for this issue.
- Bank-specific fuel trim analysis – Isolate Bank 2.
- Component testing – Smoke test, injector test, MAF verification.
Repair Costs
- All repairs should be covered under warranty.
- Out-of-pocket estimates: Vacuum leak $80–$700, injector $200–$550, MAF $80–$250, software update $0–$200.
Let the Dealer Handle It
With full warranty coverage on your 2024 Yukon, there's no reason to DIY. The dealer has GM diagnostic tools, access to TSBs, and uses genuine GM parts. The repair is free, and they'll ensure everything is properly fixed.
Prevention
- Follow GM's recommended service schedule
- Use Top Tier gasoline
- Report any drivability changes immediately
- Keep all service records
- Stay current on software updates at dealer visits