Code Definition

U0155 — Lost Communication with Instrument Panel Control (IPC) Module

System: Network Communication  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About U0155

U0155 is a generic (obd-ii standard) network communication diagnostic trouble code. It belongs to the U-prefix family of codes, which covers inter-module network communication (CAN, LIN, FlexRay, or similar) faults.

Scanning & clearing: Network (U) codes report communication faults between modules. When diagnosing U-codes, checking the vehicle's CAN bus integrity, supply/ground at each module, and reading all modules for related faults is usually the first step.

Because U0155 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The Instrument Panel Control module, commonly called the instrument cluster or IPC, does far more than drive gauges on a modern vehicle. It receives data from across the network to display road speed, engine speed, temperature, fuel level, and warning messages, and it also transmits its own messages carrying odometer value, fuel level, and warning lamp status, while on many platforms it participates in the immobiliser handshake and drives the driver information menu. DTC U0155 is stored by another module when those expected messages from the cluster stop arriving, either at ignition on or duri...

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