U0255 code meaning
Lost Communication With Front Display Interface Module
What U0255 means
The front display interface module is the central screen in the dashboard. Ford calls it FDIM; in the U-code table of the 2011 Saab 9-5, a GM design, the same node is the info display module with U0255. GM also shows the code inside a wider network failure: on 2017 Silverado, Sierra, Tahoe, Suburban, Yukon and Escalade, the serial data gateway (SDGM) could lock up while still powered, or its X1/X2 terminals lost tension, and U0255 then appeared among many U codes together with dead gauges, a blank radio display or even no crank. The first step was pulling the gateway fuse for one minute, with gateway software to follow (PIT5586G). So when U0255 shows up with a dozen siblings, the gateway or a shared branch is the suspect, not the screen. A dead display alone points to its own supply. Combined units use U0257.
U0255 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.3 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of U0255
- Central screen black or frozen
- Audio, climate or vehicle settings cannot be shown or changed
- With gateway faults also dead gauges, warning messages or no crank
Common causes of U0255
- Most likelyGateway module locked up or its connector terminals loose, many U codes at once (GM SDGM)
- PossibleDisplay without power or ground (fuse, connector behind the screen)
- PossibleDamaged bus wiring to the display after dashboard work
- Less likelyInternal failure of the display module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Front display interface moduleVehicle bus wiring
What each part of U0255 means
| U | Network system: communication between the control modules (CAN bus). |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 55 | The exact fault in that area. |
What to do next
- Note U0255 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 U0255
What does U0255 mean?
U0255 means "Lost Communication With Front Display Interface Module". The front display interface module is the central screen in the dashboard. It is a generic code, so it means the same on every make.
Is it safe to drive with U0255?
U0255 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will U0255 fail an emissions test?
U0255 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 U0255 to fix?
Difficulty: medium. A typical repair takes 0.3 to 2.5 hours of work. This is a job for a workshop.
Will U0255 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.