U0681Lost Communication With Throttle/Pedal Position Sensor/Switch D
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Check engine light and possibly a powertrain warning
- Sluggish, rate-limited throttle response
- Reduced power
- Likely causes
- LikelyWiring to the pedal module chafed in the footwell or at the bulkhead
- PossiblePedal module connector loose or corroded
- PossibleSensor electronics in the pedal module failed (replaced as a unit)
- RareEngine controller input or software fault
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €60 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.