Network, generic

U047D Invalid Data Received From Restraints System Sensor M

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U047D reports invalid data from restraints sensor M; U017C is lost contact. A thirteenth satellite exceeds the twelve sensor interfaces of Bosch's standard airbag control unit, so a system using M needs a larger controller such as Bosch's AB premium with up to 18. No manufacturer discloses which component is M. The fault lies in content, not in the link: a wrong sensor variant, a damaged sensor or controller software that misreads the data are typical suspects. Airbag lamp on, no MIL.

Likely causes

Sensor variant not matching the vehicle configuration
Damaged satellite sensor
Restraints controller software misinterpreting the sensor data

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 m

Related codes

U017CU047CU047EU0452

References: bosch-mobility.com, bosch-mobility.com.