U011ALost Communication With Exhaust Gas Sensor Module A
- Generic OBD-II code · Network
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- U011A appears when the engine controller loses exhaust gas sensor module A, the electronics that heat and evaluate a wide-band oxygen probe (or a similar exhaust sensor) and send the result as bus data instead of analogue signals. Chrysler's bulletin 25-002-14, which replaces 25-003-13 and 25-004-13, lists it for 2010–2012 Ram 2500/3500 pickups with the 6.7 L Cummins among oxygen-sensor faults; the prescribed fix is an overlay harness with new connectors at the sensor module before any part is changed. Module B has U016D, invalid data from A is U041B. Since the controller loses the oxygen value it needs for combustion and aftertreatment control, the MIL lights and soot-model or regeneration functions may be restricted.
- What you may notice
- MIL on
- Further oxygen-sensor codes stored
- Particulate filter regeneration restricted
- Likely causes
- LikelyHeat-stressed wiring or poor terminal contact at the sensor module connector
- PossibleSensor module without power or ground
- RareExhaust gas sensor module 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.