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U010C Lost Communication With Turbocharger/Supercharger Control Module A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

U010C reports that turbocharger/supercharger control module A, in practice the electronic actuator that positions variable-geometry vanes or a wastegate, has gone silent. GM's 2017 small-diesel table (2.8 L Duramax and Cruze diesel) watches its frames $099 and $499 on a dedicated sensor bus and logs U010C once 10 s pass without them, rated Type B with two trips, provided that bus is not off (U0076). On FCA's 2015 Ram 2500/3500 with the 6.7 L Cummins, bulletin 09-005-22 reports MIL with U010C next to P003A, P00AF, P0046 or P0234 and replaces the turbo actuator under a warranty extension. Without the actuator boost cannot be steered, so the engine limits torque. U040D is the invalid-data sibling, U010D the second module.

Likely causes

Electronic turbo actuator faulty (heat, internal electronics)
Actuator supply, fuse or ground faulty
Heat-damaged connector or bus lines at the turbo

Symptoms

  • MIL on
  • Low power, reduced boost
  • Other boost codes such as P003A or P0234 stored

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 acan bus wiring

Related codes

U010DU040DU0076P003AP0234

References: gsi.ext.gm.com, static.nhtsa.gov, en.wikipedia.org.