P2128 OBD Code Definition:
P2128 Throttle/Pedal Position Sensor/Switch E Circuit High Input
P2128 OBD Code Description:

Possible Symptoms

• MIL on
• Reduced Power Output

Possible Causes

• Faulty Accelerator Pedal (very unlikely)
• Wiring Harness Issue
• Faulty ECM
• O2 Sensor(s)

Possible Solutions

• Inspect and test Wiring harness for Accelerator Pedal, see Repair Manual
• Visually inspect O2 sensors for damage