Code Definition

P0786 — Shift/Timing Solenoid A stuck Off

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

About P0786

P0786 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 P0786 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 P0786 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects that the shift/timing solenoid 'A' is stuck in the 'off' position. This solenoid is responsible for controlling the timing and execution of gear shifts in the transmission. When it is stuck off, it fails to activate when required, leading to issues such as delayed shifts, inability to shift into or out of certain gears, or abnormal shifting patterns. The malfunction of solenoid 'A' particularly affects its designated shift range, which co...

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