What Does P0121 Mean on a 2022 Hyundai Santa Fe?
P0121 on your 2022 Hyundai Santa Fe means the throttle position sensor (TPS) is transmitting within the expected voltage range but with an abnormal pattern. The ECM sees data that doesn't correlate with pedal position, airflow, and load calculations.
The 2022 Santa Fe offers the 2.5L MPI (191 hp), 1.6L Turbo GDI hybrid (226 hp combined), or 1.6L Turbo GDI PHEV (261 hp combined). The MPI engine's port injection keeps the throttle body cleaner than the GDI powertrains. All pair with an 8-speed automatic or hybrid transmission.
Common Symptoms to Watch For
- Check engine light on
- Hesitation during acceleration
- Rough idle
- Transmission or hybrid transition feels off
- HTRAC AWD response unpredictable
- Reduced fuel economy
Top Causes Ranked by Likelihood
- Carbon buildup on throttle body (30%) – Moderate at 2-4 years. GDI powertrains more susceptible. Cost: $120–$275.
- Throttle body assembly failure (25%) – Internal TPS defect. Cost: $0 under warranty.
- ECM software calibration (25%) – An available update. Cost: $0 under warranty.
- Wiring or connector issue (15%) – Corrosion or assembly variability. Cost: $0 under warranty.
- Intake system leak (5%) – Gasket or clamp issue. Cost: $0 under warranty.
How Serious Is This Code?
P0121 is medium severity. Your Santa Fe is drivable but may feel sluggish. Warranty covers the fix. Address this soon.
Diagnostic Path
Your 2022 Santa Fe is under Hyundai's generous warranty. Take it to the dealer for GDS diagnostics at no cost.
Can You Fix This Yourself?
Hyundai's 5yr/60k basic warranty + 10yr/100k powertrain (original owner) covers everything. Go to the dealer.
Get a Free AI Diagnosis
MPI, hybrid, or PHEV? AutoDetective's free AI diagnosis targets your specific powertrain for an accurate preliminary analysis.