Code Definition

P0789 — Shift timing solenoid A circuit intermittent

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

About P0789

P0789 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 P0789 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 P0789 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 P0789 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects intermittent electrical issues in the circuit of shift/timing solenoid 'A'. This solenoid is integral in controlling the timing of gear shifts in the transmission system. An intermittent circuit issue suggests sporadic connectivity or performance problems, which can lead to irregular gear shifting, such as unpredictable shifting patterns, intermittent shifting issues, or unexpected gear engagement or disengagement. These intermittent malf...

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