U02B1 code meaning
Lost Communication With Comfort and Convenience Display A
What U02B1 means
Comfort and convenience displays are touch screens for climate, seats and similar settings, separate from the main infotainment screen. Stellantis calls them CCDM; on the Jeep Grand Wagoneer a front unit (CCDMF) is joined by a rear unit (CCDMR) for the second row, and the front one can lock out the rear. Which of them counts as A is not published. U02B1 is set when display A no longer answers the module that polls it, so its touch inputs and status vanish from the network. No manufacturer documents U02B1 itself. Field cases of these screens concern firmware: phantom touches cured by newer parts (STAR S228A000013) and wrong massage graphics fixed by a newer part and proxi alignment (S2508000061). Driving is unaffected.
U02B1 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U02B1
- Comfort display stays dark or does not react
- Climate or seat settings cannot be changed from that screen
Common causes of U02B1
- Most likelyLoose or damaged connector behind the display, often after dash work
- PossibleFuse, supply or ground of the display interrupted
- PossibleDisplay module or its firmware failed
- Less likelyLow battery voltage during start-up
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Comfort display aVehicle bus wiring
What each part of U02B1 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B1 | The exact fault in that area. |
What to do next
- Note U02B1 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 U02B1
What does U02B1 mean?
U02B1 means "Lost Communication With Comfort and Convenience Display A". Comfort and convenience displays are touch screens for climate, seats and similar settings, separate from the main infotainment screen. It is a generic code, so it means the same on every make.
Is it safe to drive with U02B1?
U02B1 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U02B1 fail an emissions test?
U02B1 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 U02B1 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2 hours of work. This is a job for a workshop.
Will U02B1 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.