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U011E Lost Communication With Throttle Actuator B Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U011E reports that the controller for throttle actuator B has gone silent. Most engines use a single electronic throttle whose motor the engine controller drives itself; a separately housed throttle controller is covered by U0107. SAE reserves B for a second actuator with its own bus-connected driver, but which production engines use one is not documented, and no manufacturer describes U011E publicly. CARB's rule for separate lack-of-communication codes is the formal basis. If control of an electronic throttle is lost, springs return the plate to a fixed limp-home opening that allows only slow driving. Software incompatibility with a throttle controller is U0308, invalid data U0408. Expect MIL, reduced power and possibly an idle-only engine.

Likely causes

Throttle B controller without power or ground
Damaged CAN wiring or connector to the controller
Throttle actuator B control module internally faulty

Symptoms

  • MIL on
  • Limp-home mode with reduced power
  • Poor throttle response or idle only

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–1,500
Time1–4 h

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

Parts involved

throttle actuator b modulecan bus wiring

Related codes

U0107U0308U0408

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