Code Definition

U0164 (20) — Lost Communication With HVAC Control Module

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

About U0164

U0164 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 U0164 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 Body Control Module (BCM), Instrument Panel Cluster (IPC), and Powertrain Control Module (PCM) communicate with the Heating, Ventilation and Air Conditioning (HVAC) control module over the Controller Area Network (CAN) to coordinate climate control operation and display status. DTC U0164 is set when a receiving module does not receive valid CAN messages from the HVAC control module within a calibrated time while the ignition is in the RUN position. Subcode 20 indicates a network timeout condition, confirming that communication with the HVAC module has been lost rather than the data being i...

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