U047B code meaning
Invalid Data Received From Restraints System Sensor K
What U047B means
U047B: restraints sensor K is heard but its values are rejected; U017A covers lost contact. No manufacturer documents the letter K publicly, so its position stays open. Eleven satellites point to a large system, yet not every function needs one of its own: Bosch's AB premium controller can house rollover and inertial sensing internally and accepts as many as 18 PSI5 sensors. Where curtains also deploy in a rollover, FMVSS 226 requires a readiness indicator and lets NHTSA ask the carmaker to describe the deploying sensor system. Airbag lamp on, no MIL.
U047B at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U047B
- Airbag warning lamp on
- Code stored in the restraints controller
Common causes of U047B
- PossibleCorroded or loose connector in the sensor line
- PossibleDefective satellite sensor
- Less likelyRestraints controller software evaluating the sensor incorrectly
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Restraints system sensor k
What each part of U047B means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7B | The exact fault in that area. |
What to do next
- Note U047B 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 U047B
What does U047B mean?
U047B means "Invalid Data Received From Restraints System Sensor K". U047B: restraints sensor K is heard but its values are rejected; U017A covers lost contact. It is a generic code, so it means the same on every make.
Is it safe to drive with U047B?
U047B does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U047B fail an emissions test?
U047B is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U047B to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U047B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.