![]() Most of the symptoms of P0622 are related to the low voltage coming from the alternator. Check engine light with P0622 (potentially with other codes).Battery or alternator light illuminated.When the PCM commands the alternator to turn on, it can detect an issue with the generator field control circuit. The whole alternator would need replacing. You can not replace the generator field coil by itself. After that, the voltage regulator will begin controlling the output of the alternator by itself. The Corolla’s PCM will send the generator turn-on signal to the alternator. The generator field control circuit controls the generator field coil. You can see a generator field coil is easily seen in the pic directly above. If you’ve ever held a new alternator, you can see the copper windings inside of it. The generator field coil is a stationary part of the alternator. Here’s a quick explanation of the definition of P0622 for the Toyota Corolla: Generator Field F Control Circuit “Generator field coil” is not a term that is thrown around a whole lot. P0622 Meaning: Generator Field F Control Circuit Malfunction This code indicates the generator field coil control circuit is malfunctioning. It’s a general code, meaning it has the same definition for the Toyota Corolla as it would any other vehicle. P0622 is a somewhat rare OBD2 trouble code. ![]()
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