P1833 on a GM vehicle means the transmission control module (TCM) has detected low voltage on the power feed circuit that supplies the automatic transmission solenoids. The TCM monitors the solenoid power circuit and sets this code when the voltage drops below the expected threshold, indicating a short to ground, high resistance, or a failing power source.
Guidance is general and written for GM vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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