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U0255 — Lost Communication Front Display Interface Module

Generic OBD-II · all makesNetwork / communication

U0255 indicates that the vehicle’s main control modules can no longer communicate with the Front Display Interface Module (FDIM) over the data network. This is a communication fault, not necessarily a failure inside the display itself, and it commonly causes the center-stack display or touch functions to stop working.

Symptoms

What causes it — most likely first

1. Failed or internally locked-up Front Display Interface Module

The FDIM can suffer internal hardware or software faults that stop it from responding on the data bus, which is the most common reason this specific lost-communication code sets.

2. Power or ground supply problem to the FDIM

Open, shorted, or high-resistance battery, ignition, or ground circuits to the display module will prevent it from waking up and communicating.

3. Data bus wiring or termination fault

Damage, corrosion, or poor connections in the CAN or LIN communication lines between the FDIM and the rest of the network can interrupt messages and trigger U0255.

4. Connector or pin damage at the FDIM harness

Loose, corroded, bent, or moisture-contaminated pins at the display connector can cause intermittent or permanent loss of communication.

5. Network interference from another failing module

A shorted control module elsewhere on the bus can sometimes pull the entire network down and cause multiple modules, including the FDIM, to report lost communication.

6. Powertrain/communication module failure

A failed engine or gateway controller is rarely the root cause of U0255; it should only be considered after the FDIM, wiring, connectors, and bus integrity have been verified.

How it's diagnosed

  1. Record all stored and pending codes from every module, then clear them and retest to see if U0255 returns and whether other U-codes accompany it.
  2. Inspect the FDIM connectors for moisture, corrosion, bent pins, and secure engagement; wiggle-test the harness while monitoring communication if possible.
  3. Check the FDIM power, ignition, and ground circuits for correct voltage, continuity, and low resistance per the manufacturer wiring diagram.
  4. Verify CAN/LIN bus voltage and resistance at the FDIM connector and confirm the network is not shorted to power, ground, or another circuit.
  5. If wiring and network integrity are good, follow the manufacturer procedure to reflash or replace the Front Display Interface Module before considering other control modules.

Code facts & related codes

SystemNetwork / communication
StandardizationSAE generic — identical on every make
Related codesU0250 — Lost Communication Impact ClassificatiU0251 — Lost Communication Running Board ContrU0252 — Lost Communication Lighting Control MoU0253 — Lost Communication Accessory Protocol U0254 — Lost Communication Remote Start ModuleU0256 — Lost Communication Front Controls Inte

Frequently asked

Does U0255 mean I need a new display screen?

Not always. The code means communication was lost, which can be caused by wiring, power, ground, or connector problems. The display module itself is a common cause, but the entire circuit must be checked first.

Can a dead battery or weak alternator cause U0255?

Yes, low system voltage can cause modules to drop off the network and store communication codes. Make sure the battery and charging system are healthy before replacing parts.

Is the PCM/ECM usually at fault for U0255?

No. Although some drivers are told to replace the PCM, U0255 specifically points to the Front Display Interface Module circuit. PCM failure is an uncommon cause and should only be considered after the FDIM, wiring, and network are proven good.

Can the display work normally even with this code stored?

Sometimes. Intermittent communication faults can set the code while the display still functions. If the fault becomes permanent, the screen or touch functions typically stop working.