Network, generic

U05B3 Invalid Data Received From Comfort and Convenience Display B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Display B is the second comfort screen on vehicles fitted with more than one, typically a rear unit from which back-seat occupants adjust climate and seats. U05B3 is set when its frames arrive but do not pass the receiver's validity checks, whereas U02B2 would mean that display B has fallen silent. No carmaker publishes U05B3 or states which screen counts as B. On the Jeep Grand Wagoneer the front display can lock out the rear one, and Stellantis uses exactly this to find out which unit issues unwanted commands such as fan changes; the rear screen then gets a newer part number with revised firmware (STAR S228A000013 and Rev. A, 2022-2023). A configuration that no longer fits after a replacement is another likely trigger. Rear climate controls may act on their own or ignore input.

Likely causes

Rear comfort display with old firmware sending spurious commands
Replacement display not configured to the vehicle
Chafed or loose wiring to the rear console display

Symptoms

  • Rear climate settings change by themselves
  • Rear comfort screen does not accept inputs
  • Front display shows rear functions as unavailable

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€80–1,600
Time0.5–2 h

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

Parts involved

comfort display b

Related codes

U02B2U05B2U02B1

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