Code Definition

P0784 — 4-5 Shift Malfunction

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

About P0784

P0784 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 P0784 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 P0784 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects a malfunction in the shifting process from 4th gear to 5th gear. This diagnostic trouble code indicates a problem within the transmission system that adversely affects the ability to smoothly transition from fourth to fifth gear. The malfunction can stem from a variety of causes, including internal mechanical wear or damage within the transmission, issues related to hydraulic pressure control, or faults within the electronic control syste...

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