Code Definition

P0979 — Shift Solenoid C Control Circuit Low

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

About P0979

P0979 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 P0979 is stored, the module has detected a signal or supply voltage lower 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 P0979 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 P0979 fault code is set when the control module detects a low voltage condition in the control circuit of Shift Solenoid C. This solenoid is essential in the functioning of automatic transmissions, where it regulates the flow of hydraulic fluid to engage or disengage gears. A low voltage condition in this circuit can suggest an electrical problem such as a short to ground, a reduction in voltage supply, or a malfunction within the solenoid itself. Low voltage can result in inadequate operation of Shift Solenoid C, potentially causing transmission issues like improper gear shifting, slippin...

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