Code Definition

U1706 (87) — CAN Communication Fault, Signal Missing

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

About U1706

U1706 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.

U1706 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) or another network control module on Fiat vehicles monitors CAN bus communication with a designated control unit assigned to node U1706. DTC U1706 with sub code 87 is set when expected CAN messages from this node are not received within the calibrated timeout period, with the sub code specifically indicating that the signal is missing rather than corrupted or implausible. The U1706 node label and the sub code combine to identify both which module has gone missing and how it failed (signal absent, late, malformed, or out of range), with the exact node varying by vehicle ...

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