Code Definition

U0074 (20) — Bluetooth Communication Failure to Phone

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

About U0074

U0074 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 U0074 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

DTC U0074 indicates a Bluetooth communication failure between the vehicle and a paired mobile phone. The telematics or infotainment module is responsible for establishing and maintaining the Bluetooth link with a paired device, and the code sets when it cannot complete or sustain that connection within the expected time or after repeated failed attempts. This represents a loss of the expected wireless data exchange rather than a wired circuit fault, and it commonly involves the phone, the pairing data, or the vehicle Bluetooth module. The user typically experiences dropped or failed phone conn...

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