Code Definition

P1810 — Controller Area Network (CAN) bus communication problem

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

About P1810

P1810 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.

P1810 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

The Transmission Control Module exchanges data with other control modules over the Controller Area Network, or CAN bus, a twisted pair communication network carrying signals such as engine torque, vehicle speed, and brake and stability data. The TCM depends on this shared data for shift scheduling, torque management, and converter clutch control. DTC P1810 sets when the TCM detects a loss or disruption of CAN communication, such as missing messages from another module within a set time, or a bus that is not communicating correctly. The cause may be the physical bus wiring, a module that has st...

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