Code Definition

P099D — Shift solenoid H control circuit malfunction

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

About P099D

P099D 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 P099D 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 P099D 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 P099D fault code is set when the vehicle's control module identifies a malfunction within the control circuit of Shift Solenoid H. This typically involves an issue in the electrical circuit controlling the solenoid, such as incorrect voltage or current, that prevents the solenoid from operating as intended. The control module continuously monitors the circuitry of Shift Solenoid H for proper operation, and if the parameters observed deviate from the expected range, it logs the P099D code.

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