Code Definition

P099F — Shift solenoid H circuit high

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

About P099F

P099F 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 P099F is stored, the module has detected a signal or supply voltage higher than the expected operating range.

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 P099F 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 P099F fault code is set when the vehicle's control module detects an excessively high voltage condition in the circuit of Shift Solenoid H. This situation arises when the voltage level in the solenoid's circuit surpasses the upper limit of the expected operational range. The control module continuously monitors the voltage of the Shift Solenoid H circuit, and when the voltage exceeds the predetermined threshold, it logs the P099F code.

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