Code Definition

P0788 — Shift timing solenoid A circuit malfunction

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

About P0788

P0788 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.

When P0788 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0788 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 P0788 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 circuit of shift/timing solenoid 'A'. This solenoid is crucial for managing the timing and execution of gear shifts within the transmission. A circuit malfunction could result from various issues such as wiring faults, connector damage, or a problem within the solenoid itself. Such a malfunction can lead to improper timing in gear shifts, resulting in delayed, harsh, or inappropriate shifting behaviour, which can sign...

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