P0171 on Your 2024 Dodge Hornet
A P0171 code on your 2024 Dodge Hornet indicates the engine control module has detected a lean air-fuel mixture. The 2024 Hornet GT features a 2.0L turbocharged four-cylinder producing 268 horsepower, while the R/T uses a 1.3L turbo with electric motor assist. Since these are inline engines, Bank 1 covers all cylinders. A lean condition means the air-fuel ratio is skewed toward too much air or insufficient fuel.
As a 2024 model, your Hornet is under the factory warranty. Understanding the issue helps you work effectively with the dealer service department.
Symptoms
- Check engine light illuminated
- Rough or inconsistent idle
- Turbo lag or hesitation on acceleration
- Reduced fuel economy
- Possible hissing from the engine area
- Less responsive throttle than expected
Common Causes
- Boost Leak (35% likelihood) - The turbo plumbing can have a factory assembly issue with a loose clamp or improperly seated hose that allows pressurized air to bypass the MAF sensor.
- MAF Sensor Defect (25% likelihood) - A factory-defective or contaminated MAF sensor can misread airflow, causing the ECM to under-fuel the engine.
- EVAP Purge Valve (20% likelihood) - The purge solenoid can stick open, introducing unmetered air into the intake manifold.
- PCM Calibration (20% likelihood) - Stellantis may have released a software update that addresses fuel trim behavior on the 2024 Hornet.
Diagnostic Steps
- Dealer TSB check. Have the dealer look for any Technical Service Bulletins for P0171 on the 2024 Hornet.
- Monitor fuel trims. LTFT above +10% confirms the lean condition.
- Inspect turbo connections. Check all charge pipes, intercooler hoses, and clamps.
- Test EVAP purge valve. Command it closed and monitor fuel trim response.
- Check for PCM update. A reflash may address the issue.
Repair Costs
- Under warranty: $0. Fully covered by Stellantis factory warranty.
- Boost pipe repair (out of warranty): $50 - $250.
- MAF sensor (out of warranty): $150 - $300.
- EVAP purge valve (out of warranty): $50 - $180.
- PCM reflash (out of warranty): $100 - $200.
Take It to the Dealer
The 2024 Dodge Hornet is covered by a 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. P0171 is a powertrain code that should be repaired at no cost by an authorized Dodge dealer. Do not attempt DIY repairs on a warrantied vehicle.
Prevention Tips
- Use OEM air filters
- Fill up with quality fuel from major brand stations
- Avoid aftermarket intake modifications while under warranty
- Respond promptly to check engine lights
- Maintain dealer service records