P0174 on Your 2023 Hyundai Palisade Explained
Your 2023 Hyundai Palisade has stored a P0174 code, meaning Bank 2 of the engine is running lean. The 2023 Palisade uses a 3.8-liter V6 engine (Lambda II) producing 291 horsepower with an 8-speed automatic transmission. Bank 2 on this V6 is the rear cylinder bank closest to the firewall.
The ECM has detected that fuel trim corrections on Bank 2 have exceeded the programmed threshold. There is too much air or too little fuel reaching the rear bank cylinders, and the computer cannot fully compensate.
Symptoms You May Experience
- Check engine light on
- Rough or uneven idle
- Noticeable power loss, especially with a full load of passengers
- Reduced fuel economy from the normal 19/26 MPG
- Hesitation during acceleration
- Possible vibration from engine misfires
Top Causes
- Vacuum Leak on Bank 2 (35% likelihood) -- Intake gaskets or hoses on the rear bank can develop leaks, even on a relatively new vehicle.
- MAF Sensor Contamination (25% likelihood) -- Oil vapor or a dirty air filter can foul the mass airflow sensor.
- Bank 2 GDI Injector Issue (25% likelihood) -- Carbon buildup or restrictions on the rear bank direct injectors.
- Exhaust Leak on Bank 2 (15% likelihood) -- A gasket leak or crack near the upstream O2 sensor on the rear exhaust.
Diagnosis Steps
- Pull all codes -- Look for P0171 and misfire codes alongside P0174.
- Compare bank fuel trims -- Elevated Bank 2 LTFT confirms the isolated lean condition.
- Smoke test -- Check for vacuum leaks on the rear bank.
- Test MAF sensor -- Verify against Lambda II specifications.
- Check GDI fuel system -- Test rail pressure and Bank 2 injector flow.
Repair Options
- Vacuum leak repair -- Fix hoses or gaskets on Bank 2.
- MAF sensor service -- Clean or replace.
- GDI injector service -- Clean or replace Bank 2 injectors.
- Exhaust repair -- Fix leaks near Bank 2 O2 sensor.
Estimated Repair Costs
- Vacuum leak repair: $160 - $550
- MAF sensor replacement: $190 - $440
- Fuel injector service/replacement: $370 - $920
- Exhaust leak repair: $230 - $650
Your 2023 Palisade is under Hyundai's full warranty. Take it to the dealer for diagnosis and repair at no cost.
Prevention Tips
- Use OEM air filters and avoid over-oiled aftermarket options
- Fill up with top-tier gasoline for GDI system health
- Report any performance concerns to your dealer while under warranty
- Follow Hyundai's maintenance schedule
- Check for TSBs and recalls