What Is the P0622 Code?
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The P0622 OBD-II diagnostic error code indicates an error in the generator field/F terminal circuit that is responsible for charging the car’s alternator and battery. This is a generic trouble code that carries this meaning for many gas-powered and hybrid vehicles, including but not limited to:
- Ford
- Dodge
- Jeep
- Chevy
- Land Rover
- Toyota
You may also be interested in P0625 – Generator Field/F Terminal Circuit Low
More About Error Code P0622
If your car activates the P0622 diagnostic error code, then this indicates your vehicle’s powertrain control module (PCM) has detected a malfunction within the generator field/F terminal circuit (or field circuit). The specification that it is the field terminal circuit indicates that the fault is most likely found in the field coil control circuit and alternator. This circuit is crucial to the proper functioning of a car as it is integral to generator operation and battery charge levels.
This code will flag in conventionally powered and hybrid vehicles (rather than electric vehicles). If the PCM detects a fault within the generator field/F terminal circuit, then it will flag a P0622 code.
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What Are the Symptoms of a P0622 Code?
If issues or faults arise within the field terminal circuit, then the first sign of a problem would be the illumination of the check engine light. There are more specific symptoms, however, which include:
- Stalling while idling
- Inadvertent engine shutoff
- Delayed engine cranking
- Lagging or rough acceleration
- Lowered fuel efficiency
- Battery discharge
What Are Some Causes of a P0622 Code?
There is a range of issues that can contribute to the activation of a P0622 code, but the most common and likely are:
- Faulty, damaged, or malfunctioning generator
- Shorted or open generator harness
- Faulty or damaged connectors in the generator circuit.
- Faulty or damaged wiring in the generator circuit.
- Faulty engine control module (ECM)
- Damage to the alternator rotor
Because this issue indicates an issue within the systems responsible for generating the alternating current and magnetic field used to power the internal systems of a car’s engine, ignoring this code can lead to a car becoming undrivable very quickly.
How Serious Is the P0622 Code?
The activation of a P0622 code is serious as it will impact your car’s drivability relatively quickly. The level of impact that this issue has on a car’s drivability will depend on the type of damage, how serious the damage is, and how advanced the issue is. If the damage is serious or advanced, then you might find that your car has serious issues with acceleration, engine function, stalling, or even failure to start.
Can I Still Drive with a P0622 Code?
It is not advisable to drive when your car has its check engine light on, and a P0622 code has been activated because this is very likely to impact engine function. Because this code is linked to problems with engine stability, stalling, and acceleration, there are serious safety risks associated with the P0622 code that could lead to loss of vehicle control. This, of course, poses risks to you and other road users.
How Easy Is It to Diagnose a P0622 Code?
Because of the complexity of this system and the likelihood of there being several contributing factors, it can be hard to diagnose all elements that are causing a P0622 code. Because of this, there are several common mistakes that can occur during the diagnosis of this issue. These include:
- Failing to check the battery. In some cases, battery issues contribute to the issue and can cause the same kinds of symptoms as a faulty field F control circuit.
- Failing to check connectors and wiring for damage as a result of loose harnesses.
The complexity of the issue and the delicate nature of many of the components means that this issue is best dealt with by a professional. If you need to find a reputable mechanic in your area, then Kelley Blue Book has a free service center locator that will form a list of local auto repair specialists and their contact details.
How Difficult Is It to Inspect a P0622 Code?
Inspecting and repairing the components commonly involved in a P0622 code can be delicate and hard to access. This makes inspection and repair (or replacement) a little tricky, but a skilled mechanic should be able to undertake the needed actions quickly and effectively. Common repairs include, but are not limited to:
- Changing faulty alternator components
- Disconnecting and testing CAN pins
- Replacing the control module ground straps
If the actual generator field/F terminal circuit is damaged or faulty, then a larger part of the system will need to be replaced, as this circuit is not designed to remove a single part.
Need Additional Help with Your P0622 Code?
If you want to understand the P0622 diagnostic code more fully, or you want information on other OBD-II diagnostic codes that your car is displaying or may display, then Kelley Blue Book has a free online OBD-II database that details the meanings, symptoms, and causes of all currently active codes. This informative database can help you to make empowered decisions about your car’s care.
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