U05B7 code meaning
Invalid Data Received From Rear Radar Module A
What U05B7 means
Rear radar modules are hidden in the corners of the rear bumper and feed blind spot warning, rear cross traffic alert and the exit warning that watches for cyclists when a door opens. Mercedes-Benz stores U05B755 on the 2026 CLA electric when the rear radar on the outer left sends implausible data because it is not configured; the driver assistance controller N62/5 then keeps several functions offline. Bulletin LI54.71-P-080345 (versions 1 and 2) has the N62/5 calibrated by teach-in, or alternatively by the calibration drive used after a bumper has been replaced. U05B7 thus points to a sensor that answers but is not accepted, unlike U02B6, where it no longer answers at all. Drivers notice a missing blind spot lamp on the left and assistance messages; driveability is unchanged.
U05B7 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 U05B7
- Blind spot indicator on the left stays off
- Rear cross traffic and exit warnings unavailable
- Assistance unavailable message in the instrument cluster
Common causes of U05B7
- Most likelyLeft rear radar not configured in the assistance controller
- PossibleRear bumper repaired or repainted, sensor mount or cover altered
- Less likelyMoisture or corrosion at the rear 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 a
What each part of U05B7 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 U05B7 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 U05B7
What does U05B7 mean?
U05B7 means "Invalid Data Received From Rear Radar Module A". Rear radar modules are hidden in the corners of the rear bumper and feed blind spot warning, rear cross traffic alert and the exit warning that watches for cyclists when a door opens. It is a generic code, so it means the same on every make.
Is it safe to drive with U05B7?
U05B7 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U05B7 fail an emissions test?
U05B7 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 U05B7 to fix?
Difficulty: hard. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will U05B7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.