What Does P0121 Mean on a 2022 Hyundai Tucson?
P0121 on your 2022 Hyundai Tucson means the throttle position sensor (TPS) is sending voltage within the expected range but with a pattern the ECM considers abnormal. Our investigators found that TPS data doesn't correlate with pedal position, airflow, and engine load calculations.
The 2022 Tucson—the first year of the all-new fourth generation on Hyundai's N3 platform—offers the 2.5L MPI (187 hp), 1.6L Turbo GDI hybrid (227 hp combined), or 1.6L Turbo GDI PHEV (261 hp combined). As a first-year redesign, calibration updates are particularly relevant. The MPI engine benefits from port injection keeping the throttle body clean.
Common Symptoms to Watch For
- Check engine light on
- Hesitation during acceleration
- Rough or fluctuating idle
- Transmission or hybrid transition feels off
- HTRAC AWD response unpredictable
- Reduced fuel economy
Top Causes Ranked by Likelihood
- Carbon buildup on throttle body (25%) – At 2-4 years, early deposits are possible. The GDI turbo accumulates faster. Cost: $120–$275.
- ECM software calibration (30%) – First-year models commonly need refinements. Cost: $0 under warranty.
- Throttle body assembly defect (25%) – Manufacturing variability on the new platform. Cost: $0 under warranty; $250–$480 otherwise.
- Wiring or connector issue (15%) – New platform harness routing may have unforeseen issues. Cost: $0 under warranty; $80–$250 otherwise.
- Intake system leak (5%) – A factory gasket or clamp issue. Cost: $0 under warranty.
How Serious Is This Code?
P0121 is medium severity. The Tucson is a family vehicle—reliable acceleration matters. Fix this soon.
Diagnostic Path
Your 2022 Tucson is under Hyundai's comprehensive warranty. Take it to the dealer for GDS diagnostics and any needed repairs at no cost.
Can You Fix This Yourself?
Hyundai's 5yr/60k basic warranty fully covers your 2022 Tucson. Original owners also have the 10yr/100k powertrain warranty. Go to the dealer—it's free.
Get a Free AI Diagnosis
Know your powertrain? AutoDetective's free AI diagnosis provides an engine-specific analysis of your P0121.