Code Definition

B278D — Compressor Communication Error

System: Body  |  Type: Generic (OBD-II Standard)  |  Make: Infiniti

About B278D

B278D is a generic (obd-ii standard) body diagnostic trouble code recorded for Infiniti vehicles. It belongs to the B-prefix family of codes, which covers body, interior, airbag, or comfort-electronics faults.

Scanning & clearing: Body (B) codes are often stored in the body control module, airbag module, or climate module. A basic OBD-II tool usually will not read body codes — an enhanced or OEM-level scan tool is typically required.

Because B278D 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 Automatic Climate Control Module communicates with the air conditioning compressor control unit via a dedicated communication line or CAN network to command compressor operation and receive status feedback. DTC B278D is set when the climate control module does not receive valid or timely communication from the compressor, or detects corrupted or implausible compressor status data for a calibrated period. This condition prevents normal compressor control and results in A/C operation being inhibited.

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