Network, generic

U0531 Invalid Data Received From Rear Gate Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The rear gate module runs a powered liftgate or tailgate: motor drive, latch, pinch sensing and the requests from switches or key fob. U0531 is stored when its messages reach other controllers with content they refuse. No manufacturer documents U0531 itself, but its lost-communication partner U0230 appears in several bulletins. GM's Saab 9-5 code list calls the unit liftgate control module; GM PIT5422 traced U0230 on 2010–2015 Equinox and Terrain to water or corrosion in connector X901 in the upper liftgate area on the low-speed LAN; Toyota T-SB-0038-15 lists U0230 with B2222 on 2008–2013 Highlander whose power back door reversed instead of latching. FCA's WL Grand Cherokee shows signal-invalid codes inside the liftgate module. Driving is unaffected.

Likely causes

Water ingress or corrosion in connectors at the liftgate
Liftgate module software fault (update available on some models)
Broken wires in the harness passing through the liftgate hinge area
Hinge or drive damage after repeated obstruction while closing

Symptoms

  • Power liftgate does not open or close electrically
  • Liftgate reverses at the fully closed position
  • Interior lamps or other body functions fail at the same time (shared LAN)

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–800
Time0.5–3 h

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

Parts involved

rear gate module

Related codes

U0230U053AU0541

References: static.nhtsa.gov, static.nhtsa.gov, saabwisonline.com, static.nhtsa.gov.