Code Definition

P1815 — Transmission shift control solenoid fault

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

About P1815

P1815 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.

P1815 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 Toyota transmission uses shift control solenoids, typically on off solenoids, that the Transmission Control Module energises in combinations to direct hydraulic pressure and engage specific gears. The module monitors the solenoid activation, its current flow, and the resulting gear engagement to confirm correct operation. DTC P1815 sets when the module detects an electrical fault on a shift control solenoid circuit, such as an open, short, or abnormal current, or a performance fault where the commanded gear is not achieved, for example a wrong gear ratio or a slip when that solenoid shoul...

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