Code Definition

P0974 — Shift Solenoid A Control Circuit High

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

About P0974

P0974 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 P0974 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 P0974 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 P0974 fault code is activated when the control module detects a high voltage condition in the control circuit of Shift Solenoid A. This solenoid is a critical component in automatic transmissions, responsible for regulating the flow of hydraulic fluid to engage or disengage specific gears. A high voltage condition in this circuit typically indicates an electrical fault, such as a short to power or an internal defect in the solenoid. High voltage can lead to overactivation or malfunctioning of Shift Solenoid A, which may result in transmission issues like harsh or erratic shifting, slipping...

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