Network, generic
U047A Invalid Data Received From Restraints System Sensor J
Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo
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.
Likely causes
Bumper-mounted sensor damaged by a parking knock or bumper repair
Line or connector fault on the sensor circuit
Controller coding does not match the fitted sensors
Symptoms
- Airbag or pedestrian protection warning shown
- 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 j
Related codes
References: bosch-mobility.com, bosch-mobility.com.