Code Definition

P1794 — Battery Voltage Circuit Malfunction

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Generic

About P1794

P1794 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1794 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.

P1794 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

This fault code is typically set by the Transmission Control Module (TCM) when it detects an abnormal or missing battery voltage signal on its power input circuit. The TCM constantly monitors the battery voltage supply to ensure it remains within a specific operating range. If the voltage drops below or exceeds the acceptable threshold, or if the supply is intermittent or missing altogether for a specified duration, the TCM will log this DTC.

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