Investigating the P0100 Code on Your 2021 Hyundai Palisade
A P0100 code on your 2021 Hyundai Palisade means the ECM has detected a malfunction in the Mass Air Flow (MAF) sensor circuit. Your Palisade's 3.8L Lambda II V6 produces 291 horsepower to move this full-size SUV, and accurate MAF data is essential for managing fuel delivery across all six cylinders. With Hyundai's generous warranty likely still covering your vehicle, the dealer is your best first step.
MAF Sensor on the Palisade's 3.8L V6
The Palisade's 3.8L GDI V6 uses a hot-wire MAF sensor to measure the substantial airflow this engine requires. The ECM uses this data for fuel injection, ignition timing, and 8-speed automatic transmission management. As a GDI engine, the intake system can accumulate oil deposits that eventually reach the MAF sensor. After four-plus years of service, contamination is the most likely cause of P0100.
Symptoms
- Check engine light on with P0100
- Reduced acceleration response, noticeable in a vehicle of this size
- Rough or unsteady idle
- Fuel economy below the expected 19-26 mpg range
- 8-speed automatic may shift roughly or hunt
- Reduced power when loaded with passengers
Ranked Causes
- Contaminated MAF sensor element (35-40%) — GDI oil vapor deposits on the sensing element after four-plus years.
- Air intake leak (20-25%) — Cracked hose, loose clamp, or deteriorated seal.
- MAF sensor failure (15-20%) — Internal electronics degradation.
- Wiring or connector issue (10-15%) — Corrosion or damage.
- Air filter condition (5-10%) — Neglected or damaged filter.
Diagnosis and Repair
- Check warranty — Your 2021 Palisade is likely within Hyundai's 5-year/60,000-mile basic warranty (through ~2026). The emissions warranty (8yr/80k) covers through 2029.
- If under warranty — Schedule dealer service for no-cost repair.
- If out by mileage — Scan codes, inspect intake, clean MAF sensor ($10-15).
- Monitor live data — Compare MAF readings against 3.8L V6 specifications. Expect 6-10 g/s at idle.
Repair Costs
- Under warranty: $0 (likely covered)
- MAF sensor cleaning: $10-15 (DIY)
- MAF sensor replacement: $130-280 parts, $60-120 labor
- Intake hose: $40-100
- Wiring repair: $100-250