P0171 on the 2023 Jeep Gladiator
A P0171 code on your 2023 Jeep Gladiator indicates the engine is running lean on Bank 1. The Gladiator uses the 3.6-liter Pentastar V6 producing 285 horsepower. Bank 1 is the rear bank of the V6, near the firewall.
As a truck built for work and off-road use, the Gladiator's engine faces demanding conditions. The ECU stores P0171 when Bank 1 fuel trim corrections exceed their limits trying to correct the lean mixture.
Symptoms
- Check engine light on
- Rough idle
- Hesitation under acceleration
- Reduced hauling and towing power
- Lower fuel economy
- Hissing or rattling from the engine area
Common Causes
- Vacuum Leaks - The Pentastar V6 intake manifold has multiple vacuum ports. Off-road vibration can loosen connections. Hoses crack from heat and dust exposure.
- MAF Sensor Contamination - Dust from trails and job sites is the top source of MAF contamination on the Gladiator.
- Exhaust Manifold Leak - The Pentastar V6's known exhaust manifold bolt issue can create leaks near the Bank 1 O2 sensor.
- Fuel Delivery Issues - Dirty injectors or a weakening fuel pump.
Diagnosis
- Full code scan - Check for P0174 and misfire codes.
- Bank fuel trim comparison
- Smoke test - Locate vacuum leaks.
- MAF and exhaust inspection
- Fuel pressure test
Repair Costs
- Vacuum hose repair - $75 to $300
- MAF sensor replacement - $160 to $350
- Exhaust manifold repair - $300 to $725
- Fuel pump replacement - $500 to $925
Diagnostic fee: $120 to $175.
Warranty
Your 2023 Gladiator is under Jeep's 3-year/36,000-mile basic warranty and 5-year/60,000-mile powertrain warranty. Schedule a dealer appointment for covered repair.
Prevention Tips
- Replace the air filter frequently if you drive off-road
- Inspect vacuum hoses after trail rides
- Follow Jeep's maintenance schedule
- Check exhaust manifold bolts periodically
- Use quality gasoline