What Does P0121 Mean on a 2022 Kia Sorento?
P0121 on your 2022 Kia Sorento means the throttle position sensor (TPS) is generating voltage within the expected range but with an abnormal performance pattern. The ECM finds a mismatch between TPS data and its calculations from pedal input, airflow, and engine load.
The 2022 Sorento offers the 2.5L MPI (191 hp), 2.5L Turbo GDI (281 hp), or 1.6L Turbo GDI hybrid (227 hp combined). The MPI engine uses port injection for cleaner throttle body operation; the GDI options are more carbon-prone. All pair with an 8-speed automatic or DCT.
Common Symptoms to Watch For
- Check engine light on
- Hesitation during acceleration
- Rough idle
- Transmission or hybrid transition feels off
- AWD response unpredictable
- Fuel economy decreased
Top Causes Ranked by Likelihood
- Carbon buildup on throttle body (30%) – At 2-4 years, early deposits on GDI engines. MPI least affected. Cost: $120–$275.
- ECM software calibration (25%) – An available update. Cost: $0 under warranty.
- Throttle body assembly failure (25%) – Internal TPS defect. Cost: $0 under warranty; $260–$500 otherwise.
- Wiring or connector issue (15%) – Corrosion or assembly variability. Cost: $0 under warranty.
- Intake system leak (5%) – Gasket or boost hose issue. Cost: $0 under warranty.
How Serious Is This Code?
P0121 is medium severity. Fix this soon—warranty coverage makes it free.
Diagnostic Path
Your 2022 Sorento is under Kia's warranty. Dealer KDS diagnostics are the most efficient path.
Can You Fix This Yourself?
Kia's 5yr/60k basic warranty + 10yr/100k powertrain (original owner) covers everything. Use your warranty.
Get a Free AI Diagnosis
AutoDetective's free AI diagnosis identifies the most likely cause for your specific Sorento powertrain.