U05B3 code meaning
Invalid Data Received From Comfort and Convenience Display B
What U05B3 means
Display B is the second comfort screen on vehicles fitted with more than one, typically a rear unit from which back-seat occupants adjust climate and seats. U05B3 is set when its frames arrive but do not pass the receiver's validity checks, whereas U02B2 would mean that display B has fallen silent. No carmaker publishes U05B3 or states which screen counts as B. On the Jeep Grand Wagoneer the front display can lock out the rear one, and Stellantis uses exactly this to find out which unit issues unwanted commands such as fan changes; the rear screen then gets a newer part number with revised firmware (STAR S228A000013 and Rev. A, 2022-2023). A configuration that no longer fits after a replacement is another likely trigger. Rear climate controls may act on their own or ignore input.
U05B3 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U05B3
- Rear climate settings change by themselves
- Rear comfort screen does not accept inputs
- Front display shows rear functions as unavailable
Common causes of U05B3
- Most likelyRear comfort display with old firmware sending spurious commands
- PossibleReplacement display not configured to the vehicle
- Less likelyChafed or loose wiring to the rear console display
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Comfort display b
What each part of U05B3 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B3 | The exact fault in that area. |
What to do next
- Note U05B3 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 U05B3
What does U05B3 mean?
U05B3 means "Invalid Data Received From Comfort and Convenience Display B". Display B is the second comfort screen on vehicles fitted with more than one, typically a rear unit from which back-seat occupants adjust climate and seats. It is a generic code, so it means the same on every make.
Is it safe to drive with U05B3?
U05B3 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U05B3 fail an emissions test?
U05B3 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 U05B3 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will U05B3 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.