What Does P0174 Mean on Your 2024 Jeep Grand Wagoneer?
The P0174 code on your 2024 Jeep Grand Wagoneer indicates that Bank 2 of the 6.4L HEMI V8 engine is running too lean. The powertrain control module has added maximum fuel trim to Bank 2 but still cannot bring the air-fuel ratio into the correct range.
Symptoms You Might Notice
- Check engine light illuminated
- Rough or unsteady idle
- Sluggish response when pressing the accelerator
- Worse fuel economy
- Engine surging at idle or low speeds
- Possible hissing or whistling from the engine bay
Common Causes of P0174 on the 2024 Grand Wagoneer
The 6.4L HEMI V8 in the Grand Wagoneer demands high fuel volume and precise air metering:
- Vacuum Leak — Intake manifold gaskets, vacuum hoses, or the MDS (cylinder deactivation) solenoid connections can leak, allowing unmetered air into the engine.
- MAF Sensor Problem — A contaminated or defective mass airflow sensor underreports air volume, causing the PCM to under-fuel Bank 2.
- Fuel Delivery Issue — A fuel pump not reaching specification or a restricted fuel supply line can cause low pressure under load.
- O2 Sensor Malfunction — A faulty Bank 2 oxygen sensor may report false lean readings.
How to Diagnose the Problem
- Scan all codes and review freeze frame data.
- Monitor Bank 2 fuel trims — LTFT above +10% confirms a lean condition.
- Inspect intake manifold gaskets, vacuum hoses, and MDS connections.
- Smoke test the intake for hidden leaks.
- Test fuel pressure at the rail — expect 55-62 PSI on the 6.4L HEMI.
- Clean or test the MAF sensor.
Repair Options and Estimated Costs
- Vacuum leak repair: $150–$500. Can be labor-intensive on the V8.
- MAF sensor replacement: $160–$380. Easy bolt-on job.
- Fuel pump replacement: $600–$1,000 with labor.
- O2 sensor replacement: $200–$450. Moderate difficulty.
Can You Still Drive?
Short, gentle driving is fine, but take your Grand Wagoneer to the dealer promptly. Catalytic converter replacement on this vehicle can exceed $2,000, so early repair saves significant money.
Prevention Tips
- Your 2024 Grand Wagoneer is under warranty — use dealer service for any engine codes.
- Use premium fuel as recommended for the 6.4L HEMI.
- Follow the recommended maintenance schedule precisely.
- Have fuel system service performed at recommended intervals.
- Address any dashboard warning lights immediately.