U010ALost Communication With Exhaust Gas Recirculation Control Module A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- U010A is set when a stand-alone control module for exhaust gas recirculation A stops communicating. J2012 reserves this slot for engines whose EGR valve or EGR system is run by its own electronics on the bus rather than as a plain output of the engine controller; module B (U010B) would be a second such unit. No manufacturer documents U010A publicly, and the NHTSA bulletin index holds no entry for it. Because EGR lowers combustion temperature and NOx, CARB requires it to be monitored, so a lost EGR controller counts as emission-relevant. The nearest documented case is GM's boost control module (U010C), a smart actuator on a sensor bus. Expect EGR shut off and possibly reduced power. U040B covers invalid data.
- What you may notice
- MIL on
- EGR deactivated, higher NOx
- Possible reduced power mode
- Likely causes
- LikelyEGR module A without power or ground
- PossibleHeat-damaged wiring or connector near the exhaust side
- PossibleOpen or shorted bus lines to module A
- RareEGR module A internally faulty
- 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 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.