U046E code meaning
Invalid Data Received From Exhaust Gas Sensor Module B
Network system Generic code U04xx codes Check engine light
What U046E means
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.
U046E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairAfter a drive cycle
Symptoms of U046E
- Check engine lamp on
- Exhaust aftertreatment or emission warning
- Higher fuel or urea consumption from substitute values
Common causes of U046E
- Most 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
- Less likelyInternal electronics fault in exhaust gas sensor module B
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust gas sensor module b
What each part of U046E means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6E | The exact fault in that area. |
What to do next
- Note U046E and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U046E
What does U046E mean?
U046E means "Invalid Data Received From Exhaust Gas Sensor Module B". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U046E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will U046E fail an emissions test?
Yes, it can. U046E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is U046E to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will U046E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.