U010E code meaning
Lost Communication With Reductant Control Module
Network system Generic code U01xx codes Check engine light
What U010E means
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.
U010E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of U010E
- MIL and DEF/AdBlue warning
- Countdown to speed limit or restart block
- Further SCR codes such as P20EE
Common causes of U010E
- Most 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
- Less likelyEngine controller software setting the code falsely
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Reductant control moduleCAN bus wiring
What each part of U010E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 0E | The exact fault in that area. |
What to do next
- Note U010E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U010E
What does U010E mean?
U010E means "Lost Communication With Reductant Control Module". U010E concerns the reductant control module that runs dosing, pump and heaters of a diesel SCR system with urea solution (DEF/AdBlue). It is a generic code, so it means the same on every make.
Is it safe to drive with U010E?
Drive gently and only to a workshop. With U010E the car can go into limp mode (reduced power) to protect itself.
Will U010E fail an emissions test?
Yes, it can. U010E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U010E to fix?
Difficulty: medium. A typical repair takes 0.5 to 4 hours of work. This is a job for a workshop.
Will U010E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.