P2111 – Throttle Actuator Control System – Stuck Open

Description

The ECM detects the throttle plate is stuck open and cannot return to the commanded position.

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Symptoms

High idle
Unintended acceleration
Harsh gear engagement
Check Engine light

Causes

Carbon buildup
Mechanical binding
Faulty throttle actuator
Wiring faults

Diagnosis

Inspect throttle plate movement
Check for carbon buildup
Test actuator motor
Verify wiring continuity

Repair

Clean throttle body
Replace throttle actuator
Repair wiring