What Does P0121 Mean on a 2024 Kia Sorento?
When P0121 appears on your 2024 Kia Sorento, our diagnostic investigation traces the evidence to the throttle position sensor (TPS). The sensor is transmitting within the expected voltage range but with an abnormal pattern the ECM flags as inconsistent with other engine data.
The 2024 Sorento offers multiple powertrains: 2.5L MPI (191 hp), 2.5L Turbo GDI (281 hp), 1.6L Turbo GDI hybrid (227 hp combined), or 1.6L Turbo GDI PHEV (261 hp combined). The MPI engine keeps the throttle body cleanest; all GDI options are more carbon-susceptible. The TPS is integrated into the electronic throttle body.
Common Symptoms to Watch For
- Check engine light on
- Hesitation during acceleration, especially loaded
- Rough idle
- 8-speed automatic or DCT shifting feels off
- AWD response unpredictable
- Highway Driving Assist may disengage
Top Causes Ranked by Likelihood
- ECM software calibration (35%) – Current-year calibration updates. Cost: $0 under warranty.
- Throttle body manufacturing defect (30%) – Factory defect. Cost: $0 under warranty.
- Wiring or connector defect (20%) – Assembly variability. Cost: $0 under warranty.
- Carbon buildup (10%) – Unlikely at low mileage. Cost: $120–$275 if not covered.
- Boost or intake leak (5%) – Factory issue on turbo models. Cost: $0 under warranty.
How Serious Is This Code?
P0121 is medium severity. The Sorento is a family SUV—reliable power matters. Warranty covers the fix. Address this soon.
Diagnostic Path
Take your 2024 Sorento to a Kia dealer. KDS diagnostics and any repairs are fully covered.
Can You Fix This Yourself?
Kia's 5yr/60k basic + 10yr/100k powertrain (original owner) covers everything. Dealer visit is free.
Get a Free AI Diagnosis
Which powertrain does your Sorento have? AutoDetective's free AI diagnosis provides a powertrain-specific analysis.