Network, generic

U0225 Lost Communication With Door Window Motor D

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modeNo

U0225 marks door window motor D as missing from the bus. GM's PIT5981B names U0225 last in its list for 2021–2025 Escalade, Tahoe, Suburban and Yukon and notes that the cases came mainly from vehicles altered by upfitters, so door wiring touched during a conversion deserves the first look. How the loss is noticed is shown in NXP's AN2960 window-lift example: each slave carries a response-error signal for its last frame, which lets the master watch every node, and a slave that no longer answers its header at all is exactly what a lost-communication code describes. GM asks for such faults to be fixed before the air suspension is judged. No MIL.

Likely causes

Door wiring changed during a vehicle conversion

LIN wire to motor D chafed, open or shorted

Electronics of window motor D failed

Symptoms

Window in the affected door inoperative
Air suspension not leveling on vehicles with door-ajar input via the motor
Further lost-communication codes from other door nodes

Repair estimate

DifficultyMediumWorkshop job

Parts and labour€50–700

Time0.5–3 h

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

Parts involved

door window motor dlin bus

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