U0682 means the engine computer (PCM) has lost serial-data communication with the redundant "E" channel of the throttle/accelerator pedal position sensor. Because the PCM no longer receives a valid pedal-position message on that channel, it often defaults to a reduced-power or limp-home strategy.
The pedal sensor contains redundant position channels; internal electronics, solder joints, or the "E" channel communication circuit can fail so the PCM loses contact with that channel even though wiring is intact.
Open, shorted, pinched, or chafed wires in the harness between the pedal sensor and the PCM can interrupt the data line or reference voltage for sensor E.
A blown fuse, poor ground eyelet, corroded splice, or low reference voltage can prevent the sensor module from waking up and communicating.
Bent, backed-out, oxidized, or moisture-wicked connector pins at the pedal sensor can create an intermittent or permanent loss of communication on the bus.
Added electronics, trailer wiring, alarm systems, or prior work near the pedal harness can introduce noise or shorts that disrupt the serial communication line.
A rare cause is a failed communication port inside the PCM; this should only be considered after the sensor, wiring, power, and ground have been thoroughly tested and ruled out.
No. U0682 is a communication fault with the accelerator pedal position sensor's "E" channel, not a range or performance fault of the throttle blade position sensor on the throttle body. They are separate components.
Usually not. PCM failure is an uncommon cause of this lost-communication code. Most U0682 cases are fixed by repairing wiring or connectors, or by replacing the accelerator pedal position sensor assembly.
The vehicle may still move but often enters reduced-power/limp mode, which limits acceleration. It should be diagnosed promptly because unexpected loss of throttle response can be unsafe.
OBD-II standards use the terms interchangeably. The sensor is mounted on the accelerator pedal and reports pedal position to the PCM.