Code Definition

U2199 — Incorrect Temperature Gauge Indication

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

About U2199

U2199 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 U2199 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

The engine coolant temperature gauge is driven by network data rather than by a direct sensor connection on modern vehicles. The ECM or PCM reads the engine coolant temperature sensor, a negative temperature coefficient thermistor whose resistance falls as coolant heats up, converts that resistance into a temperature value, and broadcasts it onto the data network for the instrument cluster to display. DTC U2199 is set when the cluster judges the coolant temperature value it receives to be implausible, corrupted, or inconsistent with other data such as intake air temperature and engine run time...

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