U05B6 code meaning
Invalid Data Received From Front Radar Module B
What U05B6 means
Letter B on a front radar points to different hardware depending on the brand. At Mercedes-Benz, U05B655 on the 2026 CLA electric marks implausible data from the front radar on the outer right, again with sub-code 55 for a sensor that was never configured, and it shares the remedy of the left unit: calibrating control unit N62/5 per LI54.71-P-080345. Stellantis gives B to the long-range radar behind the front bumper: on the Grand Wagoneer, lost communication U02B5 in the central ADAS module came from connector D1082A not being latched (STAR S2208000105). U05B6 itself means that module B keeps talking while its object or status data are rejected. Adaptive cruise, collision warning and lane centring then go offline; the engine lamp stays dark.
U05B6 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyHard
- Typical labor0.3 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U05B6
- Adaptive cruise control not available
- Forward collision warning switched off
- Lane centring or active driving assist not ready
Common causes of U05B6
- Most likelyRight front radar not configured after production or replacement (Mercedes)
- PossibleLong-range radar connector not fully latched (Stellantis D1082A)
- PossibleRadar cover dirty, iced or damaged
- Less likelyRadar module internally defective
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Front radar module b
What each part of U05B6 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 U05B6 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 U05B6
What does U05B6 mean?
U05B6 means "Invalid Data Received From Front Radar Module B". Letter B on a front radar points to different hardware depending on the brand. It is a generic code, so it means the same on every make.
Is it safe to drive with U05B6?
U05B6 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U05B6 fail an emissions test?
U05B6 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 U05B6 to fix?
Difficulty: hard. A typical repair takes 0.3 to 3 hours of work. This is a job for a workshop.
Will U05B6 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.