Network, generic

U0169 Lost Communication With Sunroof Control Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0169 is set when the sunroof control module drops off the vehicle network. This unit drives the motors for the glass panel and, where fitted, the sun blind, keeps track of their positions and provides the anti-pinch reversal. No manufacturer documents U0169 publicly; GM's U-code list and the bulletins in the NHTSA index do not contain it. The generic trigger described by GM for lost-communication codes applies: a periodic message expected from the module is absent at a supply of 9-16 V, and the listening body controller logs the code. Because the module usually sits in the roof next to the opening, water from blocked drains is a plausible culprit besides fuses and connectors. The roof ignores its switch and comfort closing; no MIL. U046A is invalid sunroof data.

Likely causes

Sunroof module fuse blown or ground loose
Water at module or connector from blocked roof drains
Headliner wiring or connector to the module damaged
Sunroof control module faulty

Symptoms

  • Sunroof does not open or close electrically
  • Comfort closing with the key no longer closes the roof
  • Roof positions or one-touch function lost

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€40–800
Time0.5–3 h

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

Parts involved

sunroof modulecan bus wiring

Related codes

U046AU0140

References: saabwisonline.com, en.wikipedia.org.