U0209Lost Communication With Seat Control Module B
- Generic OBD-II code · Network
- How the car detects it
- U0209 means seat control module B is no longer heard. On GM cars of 2010–2015 with heated front seats (LaCrosse, Regal, Verano, Camaro, Cruze, Equinox, Malibu, Sonic, Volt, Terrain) the HVAC module logs it when both seat heaters quit: preliminary information PIC5954 blames intermittent software in seat heating module K29, which is reset by pulling its fuse for five minutes, and PIC5954B adds a reprogramming; replacing the module is ruled out. The 2011 Saab 9-5 list also calls it the front seat heating module. Newer GM SUVs fill the slot differently: PIT5762F (2020–2023 Tahoe, Escalade, Corvette and others) names the driver seat bolster memory module and treats a history entry as ignorable. No MIL.
- What you may notice
- Both front seat heaters inoperative
- Side bolster adjustment of the driver seat does not react
- Likely causes
- LikelySeat heating module software hangs (GM K29, reset and reprogram)
- PossibleStored history entry from a software anomaly (GM 2020–2023 SUVs)
- PossibleFuse or supply of the seat module
- RareSeat harness damaged under the seat
- Repair
- Easy · Often possible to do yourself.Typical cost: €0 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.