U010ELost Communication With Reductant Control Module
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- U010E concerns the reductant control module that runs dosing, pump and heaters of a diesel SCR system with urea solution (DEF/AdBlue). GM's 2017 small-diesel table expects frame $092 and several $4Cx/$4Ex frames on bus B and, after 10 s of silence, records a Type A fault with MIL on the first trip, unless bus B is off (U0074). GM's 2025 central gateway judges its DEF controller differently: messages overdue by 2.5 periods for 6.5 s with battery above 7 V give Type B. For Ram 3500–5500 cab chassis with the 6.7 L Cummins (2012), bulletin 18-012-13 brought ECM software against needless MIL with U010E. Without the module no reductant is dosed, NOx rises and the inducement logic may cap speed. U040F covers invalid data.
- What you may notice
- MIL and DEF/AdBlue warning
- Countdown to speed limit or restart block
- Further SCR codes such as P20EE
- Likely causes
- LikelyReductant module without power or ground (fuse, relay)
- PossibleCorroded or wet connector at the tank-mounted module
- PossibleDamaged bus lines along the frame to the module
- RareEngine controller software setting the code falsely
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.