Code Definition

U0142 (87) — Lost Communication With Body Control Module B

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

About U0142

U0142 is a generic (obd-ii standard) network communication diagnostic trouble code recorded for Ford 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.

Because U0142 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 Powertrain Control Module (PCM), Body Control Module A (BCM A), and other networked modules communicate with Body Control Module B (BCM B) over the Controller Area Network (CAN) to coordinate secondary body and convenience functions. DTC U0142 is set when required CAN messages from BCM B are not received within a calibrated time while the ignition is in the RUN position. Subcode 87 indicates a missing or invalid message condition, confirming a loss of communication rather than a data plausibility fault.

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