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U046E Invalid Data Received From Exhaust Gas Sensor Module B

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

U046E points to the B unit among exhaust gas sensor modules, a second smart device that warms a probe in the exhaust, interprets its signal, typically from a wide-band oxygen or NOx sensor, and transmits readings and readiness as bus data. The engine or aftertreatment controller sets it when frames still arrive but fail checksum or counter tests, or values such as NOx level or the ready flag are not credible. Which probe is B is up to the maker, often the one behind the SCR catalyst. No manufacturer documents U046E publicly. Chrysler bulletin 25-002-14 shows such a module on Cummins 6.7 L Ram heavy-duty pickups, there with its lost-contact code U011A. CARB counts these sensors as emission monitors that must be checked for rationality. Expect the MIL and urea dosing or mixture control on defaults. U041B is module A, U016D lost contact.

Likely causes

Heat-damaged or corroded connector and harness at the sensor module
Aged or contaminated probe making the module report implausible values
Calibration mismatch after replacing the sensor module
Internal electronics fault in exhaust gas sensor module B

Symptoms

  • Check engine lamp on
  • Exhaust aftertreatment or emission warning
  • Higher fuel or urea consumption from substitute values

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–900
Time0.5–2 h

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

Parts involved

exhaust gas sensor module b

Related codes

U041BU016DU011A

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