U0682: Lost Communication With Throttle/Pedal Position Sensor/Switch E

What it means

The vehicle bus reports loss of communication with smart throttle/pedal position sensor E. The ECM loses one of the redundant pedal channels and reverts to a fail-safe pedal map.

At a glance

• Usually lights the warning light of the system that lost communication
• Affects emissions; the car can fail an emissions test
• The engine or gearbox may go into limp mode

How it works

Throttle/pedal position channel E is one of the networked redundant inputs the engine controller checks to validate driver demand. This code sets when channel E's messages are lost, so the controller may reject that channel and switch to a fail-safe pedal strategy.

Common causes

Most likely first.

1. Bus wiring open or shorted
2. Module without power or ground
3. Module failed

Symptoms

• Multiple warning lights may illuminate
• Affected modules may go into limp mode or shut down
• Specific functions inoperative depending on module
• Diagnostic tools may show communication faults

How to diagnose it

1. Record freeze-frame data and scan all modules for communication and throttle-related codes to check whether channel E is part of a broader fault.
2. View channel E and the other pedal channels in live data while slowly pressing and releasing the pedal with the vehicle stationary.
3. Inspect the channel E connector and its bus wiring for loose terminals, corrosion, moisture, chafing, or a broken wire.
4. Check the sensor or module's power and ground using the manufacturer's procedure.
5. Test the channel E bus branch for opens or shorts, then assess the sensor or module if its wiring and supplies are correct.

Common fixes

• Secure or clean the channel E connector.
• Repair damaged channel E bus wiring or terminals.
• Repair a failed power or ground connection to the sensor or module.
• Replace the channel E sensor or module if circuit tests show an internal failure.

Can I keep driving?

Throttle response may be limited or unreliable, so avoid driving at speed or in heavy traffic and stop if acceleration does not respond predictably. Have the fault addressed promptly because the controller may use a reduced-power fail-safe strategy.