Network, generic

U0226 Lost Communication With Door Window Motor E

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

U0226 is stored when door window motor E stops answering. No manufacturer documents U0226 publicly, and the door behind letter E is the maker's choice. Water, however, is a proven cause of failure for window motors with built-in electronics. Tesla bulletin SB-18-11-005 R1 replaced both front window motor and regulator units on Model 3 cars built before about January 2018 because water could get inside the motors and make them fail. GM bulletin 18-NA-079 found water and corrosion at the driver window motor connector on 2014–2018 trucks and replaced motor and door harness together. A leaking door membrane or water deflector is therefore worth checking first. No MIL.

Likely causes

Water inside the motor housing or its electronics

Corroded motor connector

Door membrane or water deflector not sealing

Broken wire in the door harness

Symptoms

Window stops working, often after rain or a car wash
Window moves jerkily before failing completely
Corrosion or moisture visible at the motor plug

Repair estimate

DifficultyMediumDIY possible

Parts and labour€80–700

Time1–3 h

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

Parts involved

door window motor elin bus

References: static.nhtsa.gov, static.nhtsa.gov.