What P0174 Means on Your 2024 Ram 2500
When your 2024 Ram 2500 sets a P0174 code, the PCM has detected a lean air-fuel condition on Bank 2. The 2024 Ram 2500 gas engine is the 6.4L HEMI V8 producing 410 horsepower and 429 lb-ft of torque. Bank 2 is the passenger side of the engine. A lean condition means too much air relative to fuel on that bank's cylinders.
For a heavy-duty truck, this issue demands prompt attention since you need full engine performance for towing and hauling tasks.
Symptoms
- Check engine light on
- Rough or uneven idle
- Reduced power under load
- Poor fuel economy
- Hesitation during acceleration
- Possible engine knock under heavy throttle
Common Causes
- Exhaust Manifold Leak (30% likelihood) – Even on newer HEMI engines, exhaust manifold bolt failures can occur. The thermal cycling from heavy use accelerates bolt fatigue.
- Vacuum Leak (25% likelihood) – Factory assembly issues or material defects in intake components can create leaks.
- Fuel Injector Issue (25% likelihood) – A defective or contaminated injector on Bank 2 limits fuel delivery.
- MAF Sensor Problem (20% likelihood) – A factory defect or early contamination can cause inaccurate readings.
Diagnosis
- Dealer visit – Under warranty, take it to the dealer first.
- Compare bank fuel trims – Bank-specific LTFT analysis isolates the problem.
- Exhaust manifold inspection – Check for soot around bolts and listen for ticking.
- Smoke test – Find intake vacuum leaks.
- Injector and MAF testing – Verify proper operation of all fuel system components.
Repair Costs
- Exhaust manifold – Bolt/gasket: $250–$600. Manifold: $500–$1,100.
- Vacuum leak – $80–$500.
- Fuel injector – $200–$600 per injector with labor.
- MAF sensor – $100–$280.
Warranty: The 2024 Ram 2500 is covered by a 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. This repair should be covered.
Let the Dealer Handle It
With full warranty coverage, the dealer is your best option. They have Ram-specific diagnostic tools and will use genuine parts. If the exhaust manifold bolts are the issue, this is a known HEMI concern that dealers are experienced in resolving.
Prevention
- Follow Ram's heavy-duty maintenance schedule
- Use quality fuel
- Report any exhaust ticking sounds to the dealer immediately
- Keep up with regular inspections
- Avoid modifications that could affect warranty coverage