U047C code meaning
Invalid Data Received From Restraints System Sensor L
What U047C means
U047C sets when restraints sensor L still communicates but delivers unusable data; U017B is the lost-contact partner. L is the twelfth sensor letter, and twelve is exactly the number of PSI5 sensor interfaces Bosch quotes for its standard airbag control unit; more requires the premium version. No carmaker publishes what sits behind L. PSI5 frames carry a parity bit or a short CRC, so a corrupted telegram is caught before its value reaches the crash algorithm. Airbag lamp on, no MIL.
U047C 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 U047C
- Airbag warning lamp on
- Code stored in the restraints controller
Common causes of U047C
- PossibleDamaged shielding or twisted pair causing checksum errors
- PossibleDefective satellite sensor
- Less likelyController coding not matching the sensor equipment
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Restraints system sensor l
What each part of U047C means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 7C | The exact fault in that area. |
What to do next
- Note U047C 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 U047C
What does U047C mean?
U047C means "Invalid Data Received From Restraints System Sensor L". U047C sets when restraints sensor L still communicates but delivers unusable data; U017B is the lost-contact partner. It is a generic code, so it means the same on every make.
Is it safe to drive with U047C?
U047C does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U047C fail an emissions test?
U047C 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 U047C to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U047C clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.