Network, generic

U0683 Lost Communication With Throttle/Pedal Position Sensor/Switch F

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

A third pedal track F is rare. It appears where a pedal module carries three signals, or where the F letter is used for an extra switch or a throttle input; the correlation codes P2139 (D/F), P2140 (E/F) and P212F (F/G) show that the scheme pairs F both with the pedal tracks and with throttle sensor G. U0683 means that digital frames for input F have stopped or fail their checks. No manufacturer documents the code publicly, and neither the Ford nor the GM tables examined contain any F input at all: both work with two pedal tracks, D and E. Analog faults of F would be P2130 to P2134. The effect depends on the role of F; with one redundant track gone, the controller usually limits power and the warning lamp comes on.

Likely causes

Wiring for input F open, shorted or chafed

Connector at the pedal or sensor module loose or corroded

Sensor electronics for input F failed

Symptoms

Check engine light
Reduced power or limited throttle response
Additional correlation codes possible

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–450

Time0.3–2 h

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

Parts involved

throttle pedal sensor fvehicle bus wiring

References: law.cornell.edu, fordservicecontent.com, en.wikipedia.org.