Network, generic
U047C Invalid Data Received From Restraints System Sensor L
Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo
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.
Likely causes
Damaged shielding or twisted pair causing checksum errors
Defective satellite sensor
Controller coding not matching the sensor equipment
Symptoms
- Airbag warning lamp on
- Code stored in the restraints controller
Repair estimate
DifficultyHardWorkshop job
Parts and labour€50–600
Time0.5–3 h
Typical range across vehicles; the real cost depends on what the testing finds.
Parts involved
restraints system sensor l
Related codes
References: bosch-mobility.com, psi5.org, en.wikipedia.org.