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U010D Lost Communication With Turbocharger/Supercharger Control Module B

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U010D is the counterpart of U010C for a second charger control module, B. It applies to engines with two independently actuated chargers, such as sequential or twin turbo layouts, or a turbo plus an electronically controlled supercharger. Every node that expects cyclic data from module B logs the code once that traffic stops. No manufacturer documents U010D publicly and the NHTSA bulletin index lists it nowhere, so thresholds are unknown; GM's handling of module A (10 s, Type B, two trips) shows the usual pattern. With one charger uncontrolled, the engine controller typically caps boost and torque and may light the MIL, because boost control is emission-relevant under CARB. U040E covers invalid data from module B.

Likely causes

Charger module B without power or ground
Heat-damaged wiring or connector at the second charger
Charger actuator/module B internally faulty

Symptoms

  • MIL on
  • Reduced power, second charger not used
  • Module B not reachable with a scan tool

Repair estimate

DifficultyHardWorkshop job
Parts and labour€150–2,500
Time1–5 h

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

Parts involved

turbo module bcan bus wiring

Related codes

U010CU040EP0234

References: law.cornell.edu, en.wikipedia.org, gsi.ext.gm.com.