Network, generic

U041B Invalid Data Received From Exhaust Gas Sensor Module A

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modeNo

U041B names exhaust gas sensor module A, an electronic unit that heats and evaluates an exhaust probe, usually a wide-band oxygen sensor, and sends the result as bus data. The engine controller sets the code when the module still talks but its values fail plausibility, carry wrong counters or report the sensor as not ready. No manufacturer documents U041B publicly. Chrysler shows such a module on the Cummins 6.7 L in 2010-2012 Ram heavy-duty pickups: bulletin 25-002-14 lists its lost-communication code U011A among oxygen sensor faults and fits an overlay harness to the module before parts are replaced. CARB requires digital inputs of emission controls to be checked for out-of-range and rationality faults. Expect the MIL and closed-loop or aftertreatment functions held back. U046E is module B.

Likely causes

Heat-damaged sensor harness or connector at the sensor module
Aged or contaminated probe giving implausible readings
Exhaust gas sensor module internally faulty

Symptoms

  • Check engine light
  • Higher fuel use or regeneration problems on diesels

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

exhaust gas sensor module acan bus wiring

Related codes

U011AU046EU016D

References: static.nhtsa.gov, law.cornell.edu.