When your 2023 Kia Sorento's gas pedal feels disconnected from the engine, and code P2135 appears, the ECM has detected that the two throttle position sensors on the throttle body aren't agreeing with each other. This correlation error causes the system to distrust throttle inputs and limit engine response.
The Throttle Body Sensor System
The Sorento's 2.5L turbocharged and 2.5L hybrid engines use a sophisticated electronic throttle body with dual TPS sensors. P2135 indicates these sensors are providing different readings for the same throttle plate position. Since the ECM can't determine which sensor is correct, it enters a protective mode.
Causes of the Disconnected Feel
This symptom with P2135 usually stems from: internal throttle body sensor failure, excessive carbon buildup causing the throttle plate to bind or stick, electrical issues with the throttle body connector, voltage supply problems from the ECM, or physical damage to the throttle body linkage. The issue can affect any engine configuration.
What You'll Experience
Beyond the disconnected feeling, symptoms include: significant delay between pressing the gas and engine response, the engine revving but the car not accelerating proportionally, limp mode limiting vehicle speed, check engine light illumination, and potentially rough or unstable idle. The malfunction indicator lamp is typically steady rather than flashing.
Diagnostic Procedure
Diagnosis involves monitoring both TPS signals simultaneously using a scan tool capable of graphing. Both sensors should track together linearly as the throttle opens and closes. Any deviation, crossover, or erratic behavior indicates throttle body failure. Technicians also check for vacuum leaks and intake system problems that could affect throttle behavior.
Restoring Proper Throttle Feel
If carbon buildup is the cause, a thorough throttle body cleaning may restore proper operation. However, if sensors are internally failing, throttle body replacement is necessary. The Sorento's throttle body is a complete assembly. After replacement, the ECM needs to relearn throttle position through an idle relearn procedure.