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U0210 Lost Communication With Seat Control Module C

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

U0210 flags lost contact with seat control module C. GM fills the slot in two ways: the 2011 Saab 9-5 list assigns it to the rear seat heating module, while bulletin 23-NA-206 and its predecessor PIT5762F (2020–2023 Escalade, Tahoe, Suburban, Yukon, Corvette, CT4, CT5) name the passenger front seat bladder control module, i.e. the air cells for lumbar support or massage. There U0210 is one of many history codes caused by software anomalies; they set no MIL or message and are simply ignored, whereas a current U0210 is diagnosed as usual. A real dropout shows as dead rear seat heaters or a passenger lumbar or massage function that no longer reacts. No MIL.

Likely causes

History entry from a software anomaly (GM 2020–2023, ignore if not current)
Seat harness unplugged or pinched
Fuse or supply of the seat module
Seat module C faulty

Symptoms

  • Rear seat heating inoperative
  • Passenger lumbar support or massage does not react
  • Code stored only in history without any complaint

Repair estimate

DifficultyMediumDIY possible
Parts and labour€0–600
Time0.2–3 h

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

Parts involved

seat module ccan bus

Related codes

U0209U0211U0511U0246

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