What P0171 Means on Your 2022 Jeep Grand Cherokee
A P0171 code on your 2022 Jeep Grand Cherokee indicates the engine is running lean on Bank 1. The 2022 Grand Cherokee offers a 3.6-liter Pentastar V6 with 293 horsepower or a 5.7-liter Hemi V8 with 357 horsepower. Both are V-configuration engines with two banks. Bank 1 contains cylinder 1, on the rear bank of the V6 or the passenger side of the Hemi V8.
The ECU stores P0171 when fuel trim corrections on Bank 1 can't compensate for the lean air-fuel ratio.
Symptoms
- Check engine light on
- Rough idle
- Hesitation on acceleration
- Reduced power
- Lower fuel economy
- Hissing or rattling from the engine
Common Causes
- Vacuum Leaks - Intake manifold gaskets, vacuum hoses, and connections. The Pentastar V6 is particularly susceptible.
- MAF Sensor Contamination - Dirt and oil vapors coat the sensor.
- Exhaust Manifold Leak - The Pentastar V6 has known exhaust manifold bolt issues. The Hemi V8 can also develop manifold leaks.
- Fuel System Problems - Weak fuel pump, dirty injectors, or failing regulator.
Diagnosis
- Full code scan - Check for P0174, misfire codes.
- Bank fuel trim comparison
- Smoke test - Find vacuum leaks.
- MAF and fuel pressure tests
- Exhaust manifold inspection
Repair Costs
- Vacuum hose repair - $75 to $300
- MAF sensor replacement - $160 to $360
- Exhaust manifold repair - $300 to $750
- Fuel pump replacement - $500 to $950
Diagnostic fee: $110 to $175.
Can You Drive?
Short commutes are fine. Do not tow with P0171 active. The Grand Cherokee's V6 catalytic converters cost $900-$1,800 per bank; the Hemi's run $1,000-$2,000+.
Prevention Tips
- Follow Jeep's maintenance schedule
- Replace air filters regularly
- Use quality fuel
- Have exhaust manifold bolts checked periodically on the Pentastar V6
- Inspect vacuum hoses during services