Code Definition

P0766 — Shift Solenoid D Stuck on Off

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0766

P0766 is a generic (obd-ii standard) powertrain diagnostic trouble code. 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.

Because P0766 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0766 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control, detects that shift solenoid 'D' is not functioning properly and remains in the 'off' position despite receiving a command to activate. Shift solenoid 'D' is integral in controlling the hydraulic fluid flow necessary for engaging or disengaging specific gears in the transmission. When the solenoid is stuck off, it fails to direct fluid flow as needed, potentially causing issues with gear engagement, irregular shifting, or the inability to shift into cert...

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