Code Definition

P1264 — VN Turbo Controller Malfunction

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

About P1264

P1264 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.

P1264 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 Variable Nozzle (VN) turbocharger uses movable vanes in the turbine housing to alter exhaust gas velocity across the turbine wheel, delivering high boost at low engine speed while controlling boost at higher speeds. The ECM commands vane position either through a vacuum actuator regulated by a vacuum switching valve, or through a DC motor driven electronic actuator with integral position feedback, depending on the engine family. P1264 sets when the actuator fails to reach or hold the commanded position, when position feedback disagrees with the command by more than a calibrated tolerance, ...

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