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The diagnostic trouble code P1794:16-48 refers to a problem with the battery voltage circuit. This code indicates that the module receiving the code has detected an issue with the voltage level in the vehicle’s battery circuit.

Here are some possible causes and solutions for this issue:

1. Weak or discharged battery: Check the battery voltage using a multimeter. If the battery voltage is low or the battery is discharged, it may need to be recharged or replaced. Ensure the battery connections are clean and tight.
2. Faulty alternator or charging system: A malfunctioning alternator or charging system can result in insufficient charging of the battery and low voltage in the battery circuit. Have the alternator and charging system checked by a professional mechanic. They can test the alternator output and charging system to ensure they are functioning properly.
3. Loose or corroded battery terminals: Check the battery terminals for tightness and signs of corrosion. Loose or corroded terminals can cause voltage issues. Clean the terminals if necessary and ensure they are securely tightened.
4. Wiring or connection issues: Inspect the wiring harness and connections related to the battery circuit. Look for any signs of damage, loose connections, or corrosion. Repair or replace any damaged wiring or connectors as needed.
5. Faulty battery sensor or module: The battery sensor or module responsible for monitoring the battery voltage circuit may be malfunctioning. A professional mechanic should perform diagnostic tests to identify and replace any faulty components.
6. Faulty voltage regulator: The voltage regulator regulates the charging voltage from the alternator. If the voltage regulator is faulty, it can result in abnormal voltage in the battery circuit. A professional mechanic should perform diagnostic tests to identify and replace a faulty voltage regulator.

It’s important to note that these are general suggestions, and the specific diagnostic and repair procedures may vary depending on the make, model, and year of your vehicle. If you are unsure or uncomfortable performing these steps yourself, it is recommended to seek assistance from a qualified mechanic or dealership. They will have the expertise and tools to accurately diagnose and resolve the battery voltage circuit issue indicated by the P1794:16-48 diagnostic trouble code.