Code Definition

U2197 — Speedometer/Odometer Is Inoperative

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

About U2197

U2197 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 U2197 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

Vehicle speed on modern vehicles is derived from the wheel speed sensors by the ABS module, or from the transmission output shaft speed sensor by the TCM or ECM, and the resulting value is broadcast onto the data network for the instrument cluster to display on the speedometer and accumulate into the odometer. DTC U2197 is stored when the cluster is not receiving a valid vehicle speed message, so the speedometer stays at zero, the odometer stops accumulating distance, and every function that depends on road speed is affected. Because the odometer is a legally significant record, most manufactu...

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