Network, generic

U02BF Lost Communication With Interior Lighting Control Module B

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

Many cars spread cabin lighting over several controllers; module B is a second unit beside module A (U024A), for example for ambient strips or a rear zone. Such nodes are usually LIN slaves of the body computer, a single-wire bus of up to about 19.2 kbit/s in which the master can detect nodes that fail. U02BF means module B no longer replies. No manufacturer documents U02BF publicly or says which unit carries the letter B. Stellantis illustrates how a separate lighting unit is serviced: on 2023-2026 Wagoneer models and the 2023-2027 Grand Cherokee the auxiliary/ambient lighting module must match the vehicle configuration with two or three seat rows; if PROXI is wrong, it is recoded and hard-reset instead of replaced (GPOP 9100834). Expect dark or fixed-colour zones; driving is not affected.

Likely causes

LIN wire or connector of module B loose, damaged or corroded
Vehicle configuration does not match the module, module not reset after coding
Lighting module internally faulty or without supply

Symptoms

  • Some cabin or ambient lights stay dark
  • Colour or brightness of a light zone can no longer be changed

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€0–400
Time0.3–1.5 h

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

Parts involved

interior lighting module bvehicle bus wiring

Related codes

U024AU05C0U054B

References: static.nhtsa.gov, en.wikipedia.org.