![]() After that, the voltage regulator will begin controlling the output of the alternator by itself. The Expedition ‘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 Ford Expedition : 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 Ford Expedition as it would any other vehicle. P0622 is a somewhat rare OBD2 trouble code.
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