Kia Sedona Throttle Position Sensor failure causing check engine light, bad acceleration, and cruise control issues on Kia Sedona

Some Kia Sedona owners report experiencing issues related to a failing throttle position sensor, which can trigger the check engine light, lead to poor acceleration, and cause problems with the cruise control system. These issues may arise due to the sensor relaying incorrect data to the vehicle's computer, resulting in poor fuel economy. Symptoms of a malfunctioning throttle position sensor include erratic idle, illumination of the check engine light, and the accumulation of dirt and grime. Specific diagnostic trouble codes, such as P2122, may indicate problems with the sensor, which could stem from a faulty TPS or damaged wiring harnesses. Resolving these issues often requires replacing the sensor or resetting the transmission by disconnecting and reconnecting the P/TRN fuse. Additionally, Kia Sedona models utilize a "fly by wire" system, making components like the gas pedal switch and the ECM/ECU critical for monitoring throttle position. If the P2138 trouble code appears, potential causes may include issues with the accelerator pedal position sensor, throttle position sensor, wiring, or PCM, with PCM issues being less likely unless indicated by a technical service bulletin. Prompt attention to throttle position sensor problems is essential for maintaining optimal performance and avoiding further complications.