U02B5 code meaning
Lost Communication With Front Radar Module B
What U02B5 means
U02B5 is set when front radar B stops answering on the network. It is one of the few codes in this group with a public manufacturer case: on the 2022 Jeep Grand Wagoneer, Stellantis STAR case S2208000105 reports Active Driving Assist as not ready while the central ADAS module (CADM) holds U02B5, because connector D1082A of the front long-range radar (LRRF), mounted behind the bumper, was not fully latched; reseating and locking it cured the fault. At Stellantis, B therefore points to the long-range radar. Mercedes-Benz gives letter B to the right-hand outer radar at the front of the 2026 CLA electric, seen in its invalid-data partner U05B655. Adaptive cruise and the driving assistant stay off until the link returns; the engine is unaffected.
U02B5 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U02B5
- Driving assistant reported as not ready
- Adaptive cruise and forward collision warning off
Common causes of U02B5
- Most likelyRadar connector not fully latched (Stellantis LRRF connector D1082A)
- PossibleWiring or radar damaged by a front impact or bumper work
- Less likelyRadar module B failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Front radar module bVehicle bus wiring
What each part of U02B5 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B5 | The exact fault in that area. |
What to do next
- Note U02B5 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 U02B5
What does U02B5 mean?
U02B5 means "Lost Communication With Front Radar Module B". U02B5 is set when front radar B stops answering on the network. It is a generic code, so it means the same on every make.
Is it safe to drive with U02B5?
U02B5 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U02B5 fail an emissions test?
U02B5 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 U02B5 to fix?
Difficulty: medium. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U02B5 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.