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P0621 Severity
Identifying an OBD code is just the start of a complete diagnostic routine. Most trouble codes are caused by a sensor reporting a value that is out of range. Just replacing a sensor may not fix underlying issues. Be sure to understand the code, the part or system in your car that the code refers to, and the risks of delaying professional repair.
Proper diagnosis will save you time and money on unnecessary repairs.
Urgent codes indicate immediate action is necessary. These are urgent and significant malfunctions that can cause severe damage to the vehicle or harm the driver and passengers.
The Alternator recharges the Battery when the engine is running. The Alternator is controlled by the engine control module (PCM). If the PCM detects an incorrect signal from the Alternator, the PCM will set code P0621.
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OBD-II Code P0621 is defined as a Generator Lamp/L Terminal Circuit
The Alternator recharges the Battery when the engine is running. The Alternator is controlled by the engine control module (PCM). If the PCM detects an incorrect signal from the Alternator, the PCM will set code P0621.