U02B6 code meaning
Lost Communication With Rear Radar Module A
What U02B6 means
Rear radar modules are hidden behind the bumper corners at the back and supply blind spot detection, which in its advanced form uses one sensor on each side, and rear cross traffic alert. U02B6 means rear radar A has stopped communicating. Stellantis cites the pair U02B6/U02B7 for the rear corner radars of the 2022-2023 Jeep Grand Cherokee, Wagoneer and Grand Wagoneer (GPOP 9100222, part 68629572): run the DTC test, then pin-unlock and swap the left and right radars and drive the car to calibrate them; if the fault stays on the same side after the swap, the wiring there is to blame. Which side is A is not stated there; on the 2026 Mercedes-Benz CLA electric, rear radar A is the outer left one. Blind spot warning on that side drops out.
U02B6 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 U02B6
- Blind spot warning unavailable on one side
- Rear cross traffic alert off, assistance message
Common causes of U02B6
- Most likelyWiring or connector in the rear bumper damaged, e.g. after a parking knock or bumper repair
- PossibleRear radar A failed (confirmed when the fault follows a left/right swap)
- PossibleWater or corrosion in the radar connector
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Rear radar module aVehicle bus wiring
What each part of U02B6 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B6 | The exact fault in that area. |
What to do next
- Note U02B6 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 U02B6
What does U02B6 mean?
U02B6 means "Lost Communication With Rear Radar Module A". Rear radar modules are hidden behind the bumper corners at the back and supply blind spot detection, which in its advanced form uses one sensor on each side, and rear cross traffic alert. It is a generic code, so it means the same on every make.
Is it safe to drive with U02B6?
U02B6 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U02B6 fail an emissions test?
U02B6 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 U02B6 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U02B6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.