What Does P0121 Mean on a 2022 Kia Sportage?
A P0121 code on your 2022 Kia Sportage tells our diagnostic investigators that the throttle position sensor (TPS) is sending voltage within the expected range but with an abnormal performance pattern. The ECM compares TPS data against accelerator pedal input, airflow, and engine load—and finds a discrepancy.
The 2022 Sportage is the first year of the all-new fifth generation, riding on a new platform shared with the Hyundai Tucson. Powertrain options include the 2.5L MPI four-cylinder (187 hp), 1.6L Turbo GDI hybrid (227 hp combined), and 1.6L Turbo GDI PHEV (261 hp combined). The MPI engine's port injection keeps the throttle body naturally clean, while the GDI powertrains are more carbon-susceptible. As a first-year redesign, calibration updates are especially relevant.
Common Symptoms to Watch For
- Check engine light on
- Hesitation during acceleration
- Rough or fluctuating idle
- 8-speed automatic or hybrid transmission feels off
- AWD response unpredictable
- Smart Cruise Control may disengage
Top Causes Ranked by Likelihood
- ECM software calibration (30%) – First-year redesigns commonly need software refinements. Cost: $0 under warranty.
- Carbon buildup on throttle body (25%) – At 2-4 years, early deposits possible on GDI engines. MPI least affected. Cost: $120–$275.
- 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 issues. Cost: $0 under warranty; $80–$250 otherwise.
- Intake system leak (5%) – Factory gasket or clamp issue. Cost: $0 under warranty.
How Serious Is This Code?
P0121 is medium severity. Your Sportage remains drivable but may feel sluggish. As a first-year model under warranty, there's no reason to delay. Schedule service soon.
Diagnostic Path
Your 2022 Sportage is under Kia's warranty. Take it to the dealer for KDS diagnostics, TSB checks, and any needed calibration updates—all at no cost.
Can You Fix This Yourself?
Kia's 5yr/60k basic warranty + 10yr/100k powertrain (original owner) covers everything. Go to the dealer.
Get a Free AI Diagnosis
Which powertrain? AutoDetective's free AI diagnosis targets the most likely cause for your specific engine configuration.