Code Definition

U1707 — B-CAN Intermittent Communication Fault

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

About U1707

U1707 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.

U1707 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 Computer (BCM) on Fiat vehicles monitors data traffic on the Body CAN (B CAN) network to ensure continuous and stable communication between body related control modules such as the instrument cluster, climate control, door modules, lighting, and comfort systems. The Body CAN is typically a lower speed CAN bus (commonly 50 to 125 kbps) where intermittent disruptions are usually caused by mechanical wire damage, marginal connectors, or a faulty module loading the bus only under certain conditions. DTC U1707 is set when the BCM detects intermittent loss, dropouts, or unstable message tra...

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