U02BF code meaning
Lost Communication With Interior Lighting Control Module B
What U02BF means
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-color zones; driving is not affected.
U02BF at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 1.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U02BF
- Some cabin or ambient lights stay dark
- Colour or brightness of a light zone can no longer be changed
Common causes of U02BF
- Most likelyLIN wire or connector of module B loose, damaged or corroded
- PossibleVehicle configuration does not match the module, module not reset after coding
- Less likelyLighting module internally faulty or without supply
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Interior lighting module bVehicle bus wiring
What each part of U02BF means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| BF | The exact fault in that area. |
What to do next
- Note U02BF and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about U02BF
What does U02BF mean?
U02BF means "Lost Communication With Interior Lighting Control Module B". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with U02BF?
U02BF does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U02BF fail an emissions test?
U02BF is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is U02BF to fix?
Difficulty: medium. A typical repair takes 0.3 to 1.5 hours of work. This is a job for a workshop.
Will U02BF clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.