U02B7 code meaning
Lost Communication With Rear Radar Module B
What U02B7 means
U02B7 reports that rear radar B, the second corner unit at the back, has gone silent. Stellantis lists it together with U02B6 for the 2022-2023 Grand Cherokee and Wagoneer models in GPOP review 9100222 and relies on a side-to-side comparison: after a pin unlock the two rear corner radars are exchanged, so the fault either follows the sensor or stays on the harness side. A swapped or new radar must then be calibrated on a drive. Mercedes-Benz assigns rear radar B to the outer right position on the 2026 CLA electric, as its invalid-data code U05B855 shows. Since blind spot and cross traffic systems need both rear corners, a fault on one side usually disables the warning for that side, and some systems shut the whole function off.
U02B7 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U02B7
- Blind spot lamp on one side stays off or shows a fault
- Rear cross traffic alert unavailable
Common causes of U02B7
- Most likelyHarness or connector on the side of radar B damaged or loose
- PossibleRear radar B failed
- Less likelyRadar replaced or swapped without completing the calibration drive
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear radar module bVehicle bus wiring
What each part of U02B7 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B7 | The exact fault in that area. |
What to do next
- Note U02B7 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 U02B7
What does U02B7 mean?
U02B7 means "Lost Communication With Rear Radar Module B". U02B7 reports that rear radar B, the second corner unit at the back, has gone silent. It is a generic code, so it means the same on every make.
Is it safe to drive with U02B7?
U02B7 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U02B7 fail an emissions test?
U02B7 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 U02B7 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U02B7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.