P0121 Hyundai Elantra
Throttle/Pedal Position Sensor A Range/Performance · Powertrain Code · High · Repair: Moderate
What is P0121?
The TPS is reading outside expected parameters for the current conditions.
When the Hyundai Elantra triggers code P0121 (throttle/pedal position sensor a range/performance), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Hyundai Elantra.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Hyundai Elantra.
Common Causes on Hyundai Elantra
- Worn throttle position sensor (TPS) element inside electronic throttle body
- Contaminated throttle body affecting TPS signal
- Wiring issue between throttle body and ECM
- Failing electronic throttle body assembly
Symptoms
- Check Engine Light on
- Erratic idle speed
- Hesitation on acceleration
- Vehicle may enter limp mode
- Surging at steady throttle
Notes for Hyundai Elantra
Hyundai throttle bodies require an idle relearn procedure after cleaning or replacement; use a scan tool.