U047A code meaning
Invalid Data Received From Restraints System Sensor J
What U047A means
U047A means the airbag controller receives restraints sensor J but its content fails validation; lost contact is U0179. Which component carries the letter J is not published anywhere. Pedestrian protection is one source of extra inputs: Bosch fits either acceleration sensors or an air-filled tube with a pressure sensor at each end into the front bumper, lets the airbag controller evaluate them and can raise the hood within 10 to 15 ms. Corrupt data from such a sensor would put that function in doubt as well. Airbag lamp on, no MIL.
U047A 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 U047A
- Airbag or pedestrian protection warning shown
- Code stored in the restraints controller
Common causes of U047A
- PossibleBumper-mounted sensor damaged by a parking knock or bumper repair
- PossibleLine or connector fault on the sensor circuit
- Less likelyController coding does not match the fitted sensors
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Restraints system sensor j
What each part of U047A means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7A | The exact fault in that area. |
What to do next
- Note U047A 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 U047A
What does U047A mean?
U047A means "Invalid Data Received From Restraints System Sensor J". U047A means the airbag controller receives restraints sensor J but its content fails validation; lost contact is U0179. It is a generic code, so it means the same on every make.
Is it safe to drive with U047A?
U047A does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U047A fail an emissions test?
U047A 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 U047A to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U047A clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.