What P0174 Means on Your 2020 Dodge Durango
A P0174 code on your 2020 Dodge Durango indicates Bank 2 is running too lean. The 2020 Durango offers the 3.6L Pentastar V6 (293 hp), 5.7L HEMI V8 (360 hp), and 6.4L HEMI V8 (475 hp in the SRT). On these V-configuration engines, Bank 2 is the passenger side. The PCM has detected that the lean fuel trim correction on that bank has exceeded its normal range.
The Durango is a family SUV that doubles as a capable tower. A lean condition affects both everyday driving comfort and towing capability.
Symptoms
- Check engine light on
- Rough or uneven idle
- Reduced power
- Worse fuel economy
- Hesitation on acceleration
- Possible engine knock under load
Common Causes
- Vacuum Leak (30% likelihood) – Intake manifold gaskets, vacuum hoses, and PCV connections develop leaks over time.
- Exhaust Manifold Leak (25% likelihood) – HEMI exhaust manifold bolt failure on the passenger side creates a false lean reading at the O2 sensor.
- MAF Sensor Contamination (25% likelihood) – Oil or dirt on the MAF hot wire causes inaccurate airflow readings.
- Fuel System Issue (20% likelihood) – Clogged injectors or weakening fuel pump, especially with MDS-equipped V8 engines.
Diagnosis
- Scan all codes – Check for P0171, misfire codes, and bank-specific data.
- Compare bank fuel trims – Isolate Bank 2 vs system-wide.
- Listen for exhaust ticking – HEMI manifold bolt indicator.
- Smoke test – Find intake vacuum leaks.
- Test MAF and fuel pressure – Verify operation.
Repair Costs
- Vacuum leak – $80–$500.
- Exhaust manifold – $200–$900.
- MAF sensor – $80–$250.
- Fuel injector – $150–$500.
- Fuel pump – $300–$600.
DIY Feasibility
The Durango's engine bay is accessible thanks to its SUV proportions. MAF cleaning is easy. Hose inspections are straightforward. Exhaust manifold bolt repair on HEMIs can be labor-intensive. Fuel system work is best left to experienced mechanics.
Prevention
- Use quality fuel (premium on V8 models)
- Replace the air filter on schedule
- Inspect exhaust manifold bolts at oil changes
- Follow the maintenance schedule
- Don't ignore exhaust ticking sounds