U02BFLost Communication With Interior Lighting Control Module B
- Generic OBD-II code · Network
- How the car detects it
- 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.
- What you may notice
- Some cabin or ambient lights stay dark
- Colour or brightness of a light zone can no longer be changed
- Likely causes
- LikelyLIN wire or connector of module B loose, damaged or corroded
- PossibleVehicle configuration does not match the module, module not reset after coding
- RareLighting module internally faulty or without supply
- Repair
- Medium · Usually a job for a workshop.Typical cost: €0 – €400
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.