Fault Family System: Network (U-Codes) 11 SAE Codes

Lost Comm Instrument Display Module

Diagnostic & Technical Explanation

U0155 (Lost Communication With Instrument Panel Cluster (IPC) Control Module) indicates loss of contact with the instrument panel cluster, a heads-up display, or a driver information/comfort display. These modules connect through a short, high-density ribbon or board-to-board connector directly behind the dash bezel, so a fault here is more often a cracked or partially seated ribbon connector from dash disassembly during other repairs than a long-run harness break. Because the cluster frequently sits at the center of the vehicle's display and gateway routing, its loss can also make several unrelated systems appear to go dark on the driver display even though only the cluster itself has failed.

These 11 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 11 times.

Codes in this family (11)

Code	Definition	Repair coverage
U0155	Lost Communication With Instrument Panel Cluster (IPC) Control Module	4 ranked fixes
U0156	Lost Communication With Information Center A	4 ranked fixes
U0157	Lost Communication With Information Center B	4 ranked fixes
U0158	Lost Communication With Head Up Display	4 ranked fixes
U0160	Lost Communication With Audible Alert Control Module	4 ranked fixes
U0255	Lost Communication With Front Display Interface Module	4 ranked fixes
U0256	Lost Communication With Front Controls Interface Module A	4 ranked fixes
U0257	Lost Communication With Front Controls/Display Interface Module	4 ranked fixes
U025D	Lost Communication With Front Controls Interface Module B	4 ranked fixes
U02B1	Lost Communication With Comfort and Convenience Display A	4 ranked fixes
U02B2	Lost Communication With Comfort and Convenience Display B	4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here:

Procedures 2..n after the first-listed procedure
Aftermarket parts cost ranges in USD (est_parts_cost_min/max_usd)
Professional labor-hour estimates (est_labor_hours)
Step-by-step diagnostic and repair instructions
Replacement-part mappings and catalog lookups
6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)

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