Code Definition

P1645 — Body Control Module fault

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Toyota

About P1645

P1645 is a manufacturer-specific powertrain diagnostic trouble code recorded for Toyota vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

P1645 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This fault code sets when the Engine Control Module (ECM) or another control unit detects a communication fault with, or a malfunction reported by, the Body Control Module (BCM). The BCM manages body systems such as lighting, central locking, and keyless entry, and shares information with the ECM and other modules over the CAN bus. If the expected BCM messages are not received within a defined time, or invalid data is detected, this code is stored. The driver may notice affected body functions, multiple warning lights, and a check engine light, depending on what the BCM controls on the vehicle...

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