Network, generic

U0523 Invalid Data Received From Door Window Motor A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

A door window motor in the J2012 sense is a lift motor with its own electronics that talks to the network, usually as a LIN slave of a door or body controller. Such a unit reports where the glass is, based on its Hall pulses, whether it stopped for an obstacle or a stall and whether its sensor or supply has failed, as NXP's MM908E624 reference design (AN3147) shows. U0523 is stored when these reports from motor A reach the master but cannot be used. No manufacturer documents the code or the door behind letter A. Typical consequences are a window that only moves while the switch is held, a missing express function or no automatic closing on locking. Lost communication with the same motor is U0222.

Likely causes

Electronics or Hall sensor in window motor A faulty
Window position not learned after battery disconnection or repair
Damaged LIN, supply or ground wire to the motor

Symptoms

  • Window moves only while the switch is held
  • Express up/down or comfort closing unavailable
  • Window stops part way

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–450
Time0.3–2 h

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

Parts involved

door window motor a

Related codes

U0222U0524U053A

References: nxp.com, law.cornell.edu.