The P2107 code on your 2021 Hyundai Sonata indicates the throttle actuator control system is stuck in the open position. This code affects your Sonata's 2.5L 4-cylinder or 1.6L turbocharged engine's electronic throttle, signaling the throttle plate is not closing properly when commanded by the PCM.
Understanding P2107 on Sonata
The electronic throttle must close properly during deceleration, idle, and engine shutdown. Code P2107 sets when the PCM commands throttle closure but the position sensor indicates it remains open, which is a serious safety concern as it can cause high idle, uncontrolled acceleration, or difficulty stopping the vehicle.
Common Symptoms
- Check engine light on
- High idle speed
- Engine races when released from accelerator
- Vehicle may accelerate without pedal input
- Difficulty slowing down or stopping
- Engine braking ineffective
- Safety concern requiring immediate attention
Primary Causes
- Throttle body motor failure
- Broken return spring in throttle body
- Throttle plate physically jammed open
- Debris holding throttle open
- Motor driver circuit stuck in open command
- Accelerator pedal sensor malfunction sending open signal
- PCM software or hardware fault
Diagnostic Procedure for 2021 Sonata
This is a safety-critical code - diagnose carefully. First, verify if throttle plate physically closes with key off by manually pressing it closed. If it springs open, the return spring or motor may be damaged. Monitor throttle position sensor readings with accelerator pedal released - should show closed or near-closed position. Check accelerator pedal sensor isn't sending errant signal. Test if motor can be commanded closed using scan tool bidirectional control.
Repair Solutions
If the throttle body cannot physically close, immediate replacement is required due to safety concerns. Do not drive the vehicle until repaired. Remove any debris blocking closure. If the return spring is broken, throttle body replacement is needed. Check accelerator pedal sensor operation and replace if faulty. After replacement, perform throttle relearn and verify proper closure during deceleration.