Code Definition

U1602 — B-CAN Line Fault

System: Network Communication  |  Type: Manufacturer-Specific  |  Make: Fiat

About U1602

U1602 is a manufacturer-specific network communication diagnostic trouble code recorded for Fiat vehicles. 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.

U1602 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The Body Control Module (BCM) and associated control units on Fiat vehicles monitor communication on the Body CAN (B CAN) network to ensure correct data exchange between body related systems such as the instrument cluster, climate control panel, door modules, comfort control, alarm system, and exterior lighting. The Body CAN is typically a lower speed CAN bus (commonly 50 to 125 kbps) running in parallel with the higher speed Powertrain CAN, with the BCM acting as the gateway between the two networks. DTC U1602 is set when a control module detects a communication failure on the Body CAN line, ...

Join TaT to view the complete code information and diagnostic details.

Quick Facts