Understanding P0121 on the 2024 Genesis G70
A P0121 on your 2024 Genesis G70 indicates the ECM has detected an abnormal throttle position sensor pattern. The voltage is in range but doesn't match your pedal inputs—our detective's investigation begins at the electronic throttle body.
The 2024 G70 offers a 2.0L turbocharged four-cylinder (252 hp) or 3.3L twin-turbo V6 (365 hp), both with direct injection. The G70's sport sedan mission demands razor-sharp throttle response. On a vehicle this new, software calibration is the primary consideration.
Symptoms
- Check engine light on
- Hesitation during acceleration
- Idle roughness
- Turbo response muted
- Sport mode throttle inconsistency
Top Causes
- ECM software calibration – Genesis continues refining powertrain software. Likelihood: 35%
- Carbon deposits – DI turbo carbon from city driving. Likelihood: 30%
- Throttle body defect – Manufacturing issue. Likelihood: 20%
- Connector issue – Factory assembly problem. Likelihood: 10%
- Boost system anomaly – Wastegate or piping. Likelihood: 5%
Cost
- All repairs: $0 under warranty
- Out-of-warranty reference: Cleaning $100–$180, replacement $350–$600, software $100–$200
Genesis Concierge Has You Covered
Your 2024 G70 is fully covered under Genesis's 5-year/60,000-mile basic warranty and 10-year/100,000-mile powertrain warranty. Genesis Concierge will pick up your G70, leave a loaner, and return it after repair—all at no cost.
How AutoDetective AI Can Help
Upload your G70's scan data to AutoDetective for a free engine-specific diagnosis.