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U0477 Invalid Data Received From Restraints System Sensor G

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0477 concerns restraints sensor G, whose messages arrive but are judged invalid; U0176 is lost contact. In Chrysler's lists from NHTSA investigation PE11-019, G names the second satellite on the right flank, an acceleration sensor with internal fault B1B76, and appears only on the six-sensor Compass and Patriot. What invalid data look like in practice is spelled out in Aston Martin's restraint control module manual: for the right C-pillar sensor of the Rapide it separates a dead line, Manchester or parity errors, readings outside the measuring range and plausibility faults, and often suspects a sensor with the wrong part number. Manchester bit coding with a parity bit is the PSI5 frame format. Airbag lamp on, no MIL.

Likely causes

Sensor of an unsuitable part number installed
Trapped or chafed sensor line causing corrupted telegrams
Sensor reporting values outside its measuring range

Symptoms

  • Airbag warning lamp on
  • Right rear side impact sensing reduced

Repair estimate

DifficultyHardWorkshop job
Parts and labour€80–500
Time0.8–2.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

restraints system sensor g

Related codes

U0176U0476U0474U0452

References: static.nhtsa.gov, static.nhtsa.gov, en.wikipedia.org.