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U0608 Lost Communication With Throttle/Pedal Position Sensor/Switch C

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

Sensor C usually belongs to a second throttle body, as on engines with one throttle per bank or two throttles in parallel. Ford's 2020 to 2024 gasoline summaries spell this out: on dual-throttle applications the SENT sensor of throttle body B reports as sensor C, and U0608 sets with MIL and wrench lamp when wiring or the SENT device has been faulty for more than 4 s. P0225 and P0229 cover a self-reported fault or a brief dropout of the same sensor; oddly, Ford labels the matching shorted-line codes as sensor B. GM's dual-throttle calibration of 2023 and 2024 assigns U0608 to sensor 1 of the bank 2 throttle, 0.13 s, one trip, while that unit's second track reports as U0688. Losing one throttle forces the controller to limit both banks.

Likely causes

Wiring fault on the SENT harness branch to the second throttle body

Position sensor electronics of the second throttle body failed

Corroded or loose connector at throttle body B

Symptoms

Check engine light and, on Ford, wrench lamp
Reduced power, uneven running between banks

Repair estimate

DifficultyMediumDIY possible

Parts and labour€60–700

Time0.5–2.5 h

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

Parts involved

throttle pedal sensor csensor wiring

References: fordservicecontent.com, gsi.ext.gm.com, law.cornell.edu.