Network, generic

U02B1 Lost Communication With Comfort and Convenience Display A

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Comfort and convenience displays are touch screens for climate, seats and similar settings, separate from the main infotainment screen. Stellantis calls them CCDM; on the Jeep Grand Wagoneer a front unit (CCDMF) is joined by a rear unit (CCDMR) for the second row, and the front one can lock out the rear. Which of them counts as A is not published. U02B1 is set when display A no longer answers the module that polls it, so its touch inputs and status vanish from the network. No manufacturer documents U02B1 itself. Field cases of these screens concern firmware: phantom touches cured by newer parts (STAR S228A000013) and wrong massage graphics fixed by a newer part and proxi alignment (S2508000061). Driving is unaffected.

Likely causes

Loose or damaged connector behind the display, often after dash work
Fuse, supply or ground of the display interrupted
Display module or its firmware failed
Low battery voltage during start-up

Symptoms

  • Comfort display stays dark or does not react
  • Climate or seat settings cannot be changed from that screen

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,800
Time0.3–2 h

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

Parts involved

comfort display avehicle bus wiring

Related codes

U02B2U05B2

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.