What P0174 Means on Your 2024 Ram 3500
A P0174 code on your 2024 Ram 3500 indicates Bank 2 is running too lean. The 2024 Ram 3500 gas engine is the 6.4L HEMI V8 (410 hp, 429 lb-ft). Bank 2 is the passenger side. The PCM has detected that the air-fuel mixture on that side has more air than the system can compensate for with fuel trim adjustments.
On a one-ton truck built for maximum duty, engine reliability is paramount. A lean condition needs to be resolved before any heavy work.
Symptoms
- Check engine light on
- Rough idle
- Reduced power, particularly under load
- Poorer fuel economy
- Acceleration hesitation
- Possible engine knock under heavy throttle
Common Causes
- Exhaust Manifold Leak (30% likelihood) – Even on new trucks, HEMI exhaust manifold bolts can fail under the thermal stress of heavy-duty operation.
- Vacuum Leak (25% likelihood) – Factory assembly issues with intake gaskets or hose connections.
- Fuel Injector Defect (25% likelihood) – A manufacturing defect in a Bank 2 injector can cause lean running.
- MAF Sensor Issue (20% likelihood) – Early contamination or factory defect in the MAF sensor.
Diagnosis
- Take it to the dealer – Your 2024 Ram 3500 is under full warranty.
- Bank-specific fuel trim analysis – Isolate the problem to Bank 2.
- Exhaust manifold inspection – Check for bolt integrity and leaks.
- Intake smoke test – Find any vacuum leaks.
- Injector and MAF testing – Verify component operation.
Repair Costs
- Exhaust manifold – $250–$1,200.
- Vacuum leak – $80–$500.
- Fuel injector – $200–$600.
- MAF sensor – $100–$280.
Your 2024 Ram 3500 is covered by a 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. All repairs should be covered at no cost to you.
Dealer Service Is the Way to Go
Don't attempt DIY repairs on a brand-new one-ton truck under warranty. The dealer will diagnose and fix the issue at no charge. They have factory tools and can apply any relevant software updates or TSBs for the 2024 model year.
Prevention
- Follow Ram's recommended service schedule
- Report any exhaust sounds or drivability changes immediately
- Use quality fuel
- Follow the severe-duty maintenance schedule if towing regularly
- Keep all dealer service records for warranty purposes