What Does P0174 Mean on Your 2022 Jeep Grand Wagoneer?
A P0174 code on your 2022 Jeep Grand Wagoneer means that Bank 2 of the 6.4L HEMI V8 engine is running too lean. This powerful 471-horsepower engine needs precise fuel delivery, and a lean condition on Bank 2 means the air-fuel mixture has shifted too far toward the air side.
Symptoms You Might Notice
- Check engine light on
- Rough or uneven idle
- Hesitation or stumbling during acceleration
- Reduced fuel economy (even worse than the HEMI's normal consumption)
- Engine may surge at idle
- Possible hissing noise from the intake area
Common Causes of P0174 on the 2022 Grand Wagoneer
The 6.4L HEMI V8 is a large displacement engine with high fuel demands. Here are the most common causes:
- Vacuum Leak — The intake manifold gaskets, PCV valve, or any of the many vacuum hoses on the HEMI can develop leaks. The MDS (Multi-Displacement System) adds vacuum-operated solenoids that can fail.
- MAF Sensor Issue — The mass airflow sensor on the large intake tract can become contaminated, causing the PCM to underestimate airflow.
- Fuel Injector Problem — With 8 injectors, a clogged or stuck unit on Bank 2 (cylinders 2, 4, 6, 8) significantly affects the fuel ratio.
- Fuel Pump Weakness — The fuel pump must supply high volumes of fuel to the 6.4L. A weakening pump may not keep up under load.
How to Diagnose the Problem
- Scan all codes — check for MDS-related or misfire codes alongside P0174.
- Monitor Bank 2 fuel trims at idle and under load. LTFT above +10% confirms lean running.
- Inspect intake manifold gaskets, vacuum hoses, and MDS solenoid connections.
- Smoke test the intake system.
- Test fuel pressure at the rail — the 6.4L HEMI should read 55-62 PSI.
- Clean the MAF sensor.
Repair Options and Estimated Costs
- Vacuum leak repair: $150–$500. Gaskets and hoses on the large V8 can be labor-intensive.
- MAF sensor replacement: $150–$350. Straightforward DIY job.
- Fuel injector service or replacement: $300–$800. Professional service recommended for the HEMI.
- Fuel pump replacement: $550–$950 with parts and labor.
Can You Still Drive?
You can drive for short distances, but this is a luxury vehicle — take it to the dealer promptly. Running lean on the 6.4L HEMI can damage the catalytic converters, which are very expensive to replace on this vehicle ($1,500+).
Prevention Tips
- Follow the premium maintenance schedule for your Grand Wagoneer.
- Use quality fuel — premium is recommended for the 6.4L HEMI.
- Have the fuel system professionally serviced every 30,000 miles.
- Inspect vacuum hoses and intake connections during oil changes.
- Address check engine lights immediately on a premium vehicle like this.