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Toyota U1400 Code – CAN Bus BCM Communication Lost
Limited
Safe to drive :
Toyota vehicles only
Applies only to :
Not applicable to :
This explanation does NOT apply to other brands.
High
Severity level :
When Does This Code Appear on the Vehicles
Toyota U1400 occurs when CAN bus loses communication with body control module.
What This Code means on the Vehicles
Indicates body control module is not responding over CAN network, Toyota-specific.
Why This is different from a generic OBD2 Code
Generic scanners cannot detect CAN bus-specific OEM module errors.
Common Situations That Trigger This Code
Wiring harness issues; BCM failure; Aftermarket interference.
What Will NOT Fix This Code
Clearing code without repairing BCM or wiring.
How to Clear This Code on Vehicles
Inspect wiring and BCM; clear using Techstream.
Related Manufacturer Specific Codes
Toyota U1401; Toyota U1402
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