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U030F Software Incompatibility With Reductant Control Module

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The reductant control module runs the urea side of an SCR system: pump, dosing valve, line heaters and level reading. U030F means the engine controller has found that this module's software or calibration does not belong with its own, for example after either unit was swapped or reflashed. No manufacturer documents U030F publicly, but how software-dependent the module is can be seen in bulletins. GM's 2018 Cruze diesel needed a reflash of the K115 reductant control module because the DEF level shown did not update after refilling (18-NA-058), and FCA reprogrammed the dosing control unit of 2016 Ram 2500/3500 Cummins trucks, replacing it where necessary (25-003-17). Because SCR controls NOx, a MIL and, under CARB inducement rules, power or speed limits are possible. U010E is lost contact, U040F invalid data.

Likely causes

Dosing/reductant control unit software outdated or not released for the engine calibration
Dosing unit or DEF tank assembly with integrated controller replaced by another variant
Engine controller reprogrammed without the reductant control module

Symptoms

  • MIL and DEF/SCR warning in the cluster
  • Wrong or frozen DEF level display
  • Countdown to speed limit or reduced power

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–1,500
Time0.5–3 h

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

Parts involved

reductant control modulecontrol module software

Related codes

U010EU040FU030CP20EE

References: static.nhtsa.gov, static.nhtsa.gov, law.cornell.edu.