Code Definition

U1711 (86) — CAN Network Communication Fault, Signal Invalid

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

About U1711

U1711 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.

U1711 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

DTC U1711 is a Fiat specific network code indicating a CAN communication fault where the signal is reported as invalid. Unlike a straight loss of communication, the receiving module, often the Body Computer, is still seeing messages associated with this node but the data content is implausible, out of range, or fails its validity check. The subcode, such as :86 for signal invalid, distinguishes this from a missing message fault. This usually points to corrupted data on the bus, a module transmitting bad values, or power and ground problems affecting data integrity, and it can produce intermitt...

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