U046EInvalid Data Received From Exhaust Gas Sensor Module B
- 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
- 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.
- What you may notice
- Check engine lamp on
- Exhaust aftertreatment or emission warning
- Higher fuel or urea consumption from substitute values
- Likely causes
- LikelyHeat-damaged or corroded connector and harness at the sensor module
- PossibleAged or contaminated probe making the module report implausible values
- PossibleCalibration mismatch after replacing the sensor module
- RareInternal electronics fault in exhaust gas sensor module B
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.