Network, generic

U0681 Lost Communication With Throttle/Pedal Position Sensor/Switch D

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

In the generic code scheme the letters D, E and F normally mark the accelerator pedal tracks, while A to C and G belong to throttle bodies. U0681 is meant for a pedal module whose first track D reports digitally, for example over SENT or SPC as offered by Melexis' MLX90377 position IC, which lists pedal sensors as an application and comes as a fully redundant dual die. No manufacturer documents U0681 publicly. Ford (2024 gasoline) and GM read pedal D analog: Ford sets P2122/P2123 below 0.25 or above 4.75 V within a second, with wrench lamp and MIL. Ford also explains the fallback when one pedal input is lost: driver demand follows the remaining track at a limited rate. CARB requires pedal and redundant pedal position in the diesel data stream.

Likely causes

Wiring to the pedal module chafed in the footwell or at the bulkhead

Pedal module connector loose or corroded

Sensor electronics in the pedal module failed (replaced as a unit)

Engine controller input or software fault

Symptoms

Check engine light and possibly a powertrain warning
Sluggish, rate-limited throttle response
Reduced power

Repair estimate

DifficultyEasyDIY possible

Parts and labour€60–400

Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

throttle pedal sensor dvehicle bus wiring

References: media.melexis.com, fordservicecontent.com, law.cornell.edu.