Code Definition

P0787 — Shift timing solenoid A stuck On

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

About P0787

P0787 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 P0787 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 P0787 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems identifies that the shift/timing solenoid 'A' is continuously in the 'on' position. This solenoid is a key component in controlling the timing of gear shifts within the transmission system. A solenoid that is stuck on can lead to issues such as unintended or early shifts, inability to correctly disengage a gear, or abnormal shifting behaviour. This condition can significantly affect the vehicle's drivability, as the timing of gear shifts is cruci...

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