P0171 on the 2024 Jeep Grand Cherokee
A P0171 code on your 2024 Jeep Grand Cherokee means the engine is running lean on Bank 1. The 2024 Grand Cherokee offers a 3.6-liter Pentastar V6 producing 293 horsepower or a 2.0-liter turbocharged inline-4 making 270 horsepower. On the V6, Bank 1 is the rear bank near the firewall. The turbo-4 has only one bank.
The ECU stores P0171 when Bank 1 fuel trim corrections exceed their limits trying to enrich a lean mixture.
Symptoms
- Check engine light on
- Rough idle
- Hesitation under acceleration
- Reduced power
- Lower fuel economy
- Hissing from engine area
Common Causes
- Vacuum Leaks - The Pentastar V6 intake manifold has multiple vacuum connections. Loose clamps, cracked hoses, or gasket leaks are common.
- MAF Sensor Contamination - Dust and oil vapors reduce MAF accuracy.
- Fuel Delivery Issues - Weak fuel pump, dirty injectors, or low fuel pressure.
- Exhaust Leak Near O2 Sensor - The Pentastar V6 can develop exhaust manifold bolt issues that cause false lean readings.
Diagnosis
- Full code scan - Check for P0174 and misfire codes.
- Bank fuel trim comparison on the V6.
- Smoke test - Locate vacuum leaks.
- MAF sensor and fuel pressure tests
- Exhaust manifold inspection
Repair Costs
- Vacuum hose repair - $75 to $300
- MAF sensor replacement - $165 to $375
- Fuel pump replacement - $525 to $950
- Exhaust manifold repair - $300 to $700
Diagnostic fee: $120 to $175.
Warranty
Your 2024 Grand Cherokee is under Jeep's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. Take it to a dealer for covered repair.
Prevention Tips
- Follow Jeep's maintenance schedule
- Replace air filter at recommended intervals
- Use quality gasoline
- Have vacuum connections inspected during services
- Report any performance changes to your dealer promptly