U0169Lost Communication With Sunroof Control Module
- Generic OBD-II code · Network
- How the car detects it
- 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.
- What you may notice
- Sunroof does not open or close electrically
- Comfort closing with the key no longer closes the roof
- Roof positions or one-touch function lost
- Likely causes
- LikelySunroof module fuse blown or ground loose
- PossibleWater at module or connector from blocked roof drains
- PossibleHeadliner wiring or connector to the module damaged
- RareSunroof control module faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.