U030FSoftware Incompatibility With Reductant Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL and DEF/SCR warning in the cluster
- Wrong or frozen DEF level display
- Countdown to speed limit or reduced power
- Likely causes
- LikelyDosing/reductant control unit software outdated or not released for the engine calibration
- PossibleDosing unit or DEF tank assembly with integrated controller replaced by another variant
- PossibleEngine controller reprogrammed without the reductant control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €100 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.